[libc++][NFC] Remove unnecessary std:: uses in math.h

[EricWF]

This comment was removed by EricWF.

[EricWF]

Sorry, wrong change.

[ldionne]

I'd like CI to pass though.

libcxx/include/math.h

#else
     return signbit(__x);
 #endif
 }
 
 #undef signbit
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_floating_point<_A1>::value, bool>::type
+typename enable_if<is_floating_point<_A1>::value, bool>::type
 signbit(_A1 __x) _NOEXCEPT
 {
-    return __libcpp_signbit((typename std::__promote<_A1>::type)__x);
+    return __libcpp_signbit((typename __promote<_A1>::type)__x);
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<
-    std::is_integral<_A1>::value && std::is_signed<_A1>::value, bool>::type
+typename enable_if<
+    is_integral<_A1>::value && is_signed<_A1>::value, bool>::type
 signbit(_A1 __x) _NOEXCEPT
 { return __x < 0; }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<
-    std::is_integral<_A1>::value && !std::is_signed<_A1>::value, bool>::type
+typename enable_if<
+    is_integral<_A1>::value && !is_signed<_A1>::value, bool>::type
 signbit(_A1) _NOEXCEPT
 { return false; }
 
 #elif defined(_LIBCPP_MSVCRT)
 
 template <typename _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_floating_point<_A1>::value, bool>::type
+typename enable_if<is_floating_point<_A1>::value, bool>::type
 signbit(_A1 __x) _NOEXCEPT
 {
-  return ::signbit(static_cast<typename std::__promote<_A1>::type>(__x));
+  return ::signbit(static_cast<typename __promote<_A1>::type>(__x));
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<
-    std::is_integral<_A1>::value && std::is_signed<_A1>::value, bool>::type
+typename enable_if<
+    is_integral<_A1>::value && is_signed<_A1>::value, bool>::type
 signbit(_A1 __x) _NOEXCEPT
 { return __x < 0; }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<
-    std::is_integral<_A1>::value && !std::is_signed<_A1>::value, bool>::type
+typename enable_if<
+    is_integral<_A1>::value && !is_signed<_A1>::value, bool>::type
 signbit(_A1) _NOEXCEPT
 { return false; }
 
 #endif // signbit
 
 // fpclassify
 
 #ifdef fpclassify
#else
     return fpclassify(__x);
 #endif
 }
 
 #undef fpclassify
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_floating_point<_A1>::value, int>::type
+typename enable_if<is_floating_point<_A1>::value, int>::type
 fpclassify(_A1 __x) _NOEXCEPT
 {
-    return __libcpp_fpclassify((typename std::__promote<_A1>::type)__x);
+    return __libcpp_fpclassify((typename __promote<_A1>::type)__x);
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, int>::type
+typename enable_if<is_integral<_A1>::value, int>::type
 fpclassify(_A1 __x) _NOEXCEPT
 { return __x == 0 ? FP_ZERO : FP_NORMAL; }
 
 #elif defined(_LIBCPP_MSVCRT)
 
 template <typename _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_floating_point<_A1>::value, bool>::type
+typename enable_if<is_floating_point<_A1>::value, bool>::type
 fpclassify(_A1 __x) _NOEXCEPT
 {
-  return ::fpclassify(static_cast<typename std::__promote<_A1>::type>(__x));
+  return ::fpclassify(static_cast<typename __promote<_A1>::type>(__x));
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, int>::type
+typename enable_if<is_integral<_A1>::value, int>::type
 fpclassify(_A1 __x) _NOEXCEPT
 { return __x == 0 ? FP_ZERO : FP_NORMAL; }
 
 #endif // fpclassify
 
 // isfinite
 
 #ifdef isfinite
#else
     return isfinite(__x);
 #endif
 }
 
 #undef isfinite
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<
-    std::is_arithmetic<_A1>::value && std::numeric_limits<_A1>::has_infinity,
+typename enable_if<
+    is_arithmetic<_A1>::value && numeric_limits<_A1>::has_infinity,
     bool>::type
 isfinite(_A1 __x) _NOEXCEPT
 {
-    return __libcpp_isfinite((typename std::__promote<_A1>::type)__x);
+    return __libcpp_isfinite((typename __promote<_A1>::type)__x);
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<
-    std::is_arithmetic<_A1>::value && !std::numeric_limits<_A1>::has_infinity,
+typename enable_if<
+    is_arithmetic<_A1>::value && !numeric_limits<_A1>::has_infinity,
     bool>::type
 isfinite(_A1) _NOEXCEPT
 { return true; }
 
 #endif // isfinite
 
 // isinf
 
#else
     return isinf(__x);
 #endif
 }
 
 #undef isinf
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<
-    std::is_arithmetic<_A1>::value && std::numeric_limits<_A1>::has_infinity,
+typename enable_if<
+    is_arithmetic<_A1>::value && numeric_limits<_A1>::has_infinity,
     bool>::type
 isinf(_A1 __x) _NOEXCEPT
 {
-    return __libcpp_isinf((typename std::__promote<_A1>::type)__x);
+    return __libcpp_isinf((typename __promote<_A1>::type)__x);
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<
-    std::is_arithmetic<_A1>::value && !std::numeric_limits<_A1>::has_infinity,
+typename enable_if<
+    is_arithmetic<_A1>::value && !numeric_limits<_A1>::has_infinity,
     bool>::type
 isinf(_A1) _NOEXCEPT
 { return false; }
 
 #ifdef _LIBCPP_PREFERRED_OVERLOAD
 inline _LIBCPP_HIDE_FROM_ABI
 bool
 isinf(float __x) _NOEXCEPT { return __libcpp_isinf(__x); }
#else
     return isnan(__x);
 #endif
 }
 
 #undef isnan
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_floating_point<_A1>::value, bool>::type
+typename enable_if<is_floating_point<_A1>::value, bool>::type
 isnan(_A1 __x) _NOEXCEPT
 {
-    return __libcpp_isnan((typename std::__promote<_A1>::type)__x);
+    return __libcpp_isnan((typename __promote<_A1>::type)__x);
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, bool>::type
+typename enable_if<is_integral<_A1>::value, bool>::type
 isnan(_A1) _NOEXCEPT
 { return false; }
 
 #ifdef _LIBCPP_PREFERRED_OVERLOAD
 inline _LIBCPP_HIDE_FROM_ABI
 bool
 isnan(float __x) _NOEXCEPT { return __libcpp_isnan(__x); }
 
#else
     return isnormal(__x);
 #endif
 }
 
 #undef isnormal
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_floating_point<_A1>::value, bool>::type
+typename enable_if<is_floating_point<_A1>::value, bool>::type
 isnormal(_A1 __x) _NOEXCEPT
 {
-    return __libcpp_isnormal((typename std::__promote<_A1>::type)__x);
+    return __libcpp_isnormal((typename __promote<_A1>::type)__x);
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, bool>::type
+typename enable_if<is_integral<_A1>::value, bool>::type
 isnormal(_A1 __x) _NOEXCEPT
 { return __x != 0; }
 
 #endif // isnormal
 
 // isgreater
 
 #ifdef isgreater
 
 template <class _A1, class _A2>
 _LIBCPP_HIDE_FROM_ABI
 bool
 __libcpp_isgreater(_A1 __x, _A2 __y) _NOEXCEPT
 {
     return isgreater(__x, __y);
 }
 
 #undef isgreater
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if
+typename enable_if
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
     bool
 >::type
 isgreater(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type type;
+    typedef typename __promote<_A1, _A2>::type type;
     return __libcpp_isgreater((type)__x, (type)__y);
 }
 
 #endif // isgreater
 
 // isgreaterequal
 
 #ifdef isgreaterequal
 
 template <class _A1, class _A2>
 _LIBCPP_HIDE_FROM_ABI
 bool
 __libcpp_isgreaterequal(_A1 __x, _A2 __y) _NOEXCEPT
 {
     return isgreaterequal(__x, __y);
 }
 
 #undef isgreaterequal
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if
+typename enable_if
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
     bool
 >::type
 isgreaterequal(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type type;
+    typedef typename __promote<_A1, _A2>::type type;
     return __libcpp_isgreaterequal((type)__x, (type)__y);
 }
 
 #endif // isgreaterequal
 
 // isless
 
 #ifdef isless
 
 template <class _A1, class _A2>
 _LIBCPP_HIDE_FROM_ABI
 bool
 __libcpp_isless(_A1 __x, _A2 __y) _NOEXCEPT
 {
     return isless(__x, __y);
 }
 
 #undef isless
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if
+typename enable_if
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
     bool
 >::type
 isless(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type type;
+    typedef typename __promote<_A1, _A2>::type type;
     return __libcpp_isless((type)__x, (type)__y);
 }
 
 #endif // isless
 
 // islessequal
 
 #ifdef islessequal
 
 template <class _A1, class _A2>
 _LIBCPP_HIDE_FROM_ABI
 bool
 __libcpp_islessequal(_A1 __x, _A2 __y) _NOEXCEPT
 {
     return islessequal(__x, __y);
 }
 
 #undef islessequal
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if
+typename enable_if
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
     bool
 >::type
 islessequal(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type type;
+    typedef typename __promote<_A1, _A2>::type type;
     return __libcpp_islessequal((type)__x, (type)__y);
 }
 
 #endif // islessequal
 
 // islessgreater
 
 #ifdef islessgreater
 
 template <class _A1, class _A2>
 _LIBCPP_HIDE_FROM_ABI
 bool
 __libcpp_islessgreater(_A1 __x, _A2 __y) _NOEXCEPT
 {
     return islessgreater(__x, __y);
 }
 
 #undef islessgreater
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if
+typename enable_if
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
     bool
 >::type
 islessgreater(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type type;
+    typedef typename __promote<_A1, _A2>::type type;
     return __libcpp_islessgreater((type)__x, (type)__y);
 }
 
 #endif // islessgreater
 
 // isunordered
 
 #ifdef isunordered
 
 template <class _A1, class _A2>
 _LIBCPP_HIDE_FROM_ABI
 bool
 __libcpp_isunordered(_A1 __x, _A2 __y) _NOEXCEPT
 {
     return isunordered(__x, __y);
 }
 
 #undef isunordered
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if
+typename enable_if
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
     bool
 >::type
 isunordered(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type type;
+    typedef typename __promote<_A1, _A2>::type type;
     return __libcpp_isunordered((type)__x, (type)__y);
 }
 
 #endif // isunordered
 
 // abs
 //
 // handled in stdlib.h
 
 // div
 //
 // handled in stdlib.h
 
 // acos
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       acos(float __x) _NOEXCEPT       {return ::acosf(__x);}
 using ::acos _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double acos(long double __x) _NOEXCEPT {return ::acosl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 acos(_A1 __x) _NOEXCEPT {return ::acos((double)__x);}
 
 // asin
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       asin(float __x) _NOEXCEPT       {return ::asinf(__x);}
 using ::asin _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double asin(long double __x) _NOEXCEPT {return ::asinl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 asin(_A1 __x) _NOEXCEPT {return ::asin((double)__x);}
 
 // atan
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       atan(float __x) _NOEXCEPT       {return ::atanf(__x);}
 using ::atan _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double atan(long double __x) _NOEXCEPT {return ::atanl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 atan(_A1 __x) _NOEXCEPT {return ::atan((double)__x);}
 
 // atan2
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       atan2(float __y, float __x) _NOEXCEPT             {return ::atan2f(__y, __x);}
 using ::atan2 _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double atan2(long double __y, long double __x) _NOEXCEPT {return ::atan2l(__y, __x);}
 #    endif
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
 atan2(_A1 __y, _A2 __x) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value)), "");
     return ::atan2((__result_type)__y, (__result_type)__x);
 }
 
 // ceil
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       ceil(float __x) _NOEXCEPT       {return ::ceilf(__x);}
 using ::ceil _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double ceil(long double __x) _NOEXCEPT {return ::ceill(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 ceil(_A1 __x) _NOEXCEPT {return ::ceil((double)__x);}
 
 // cos
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       cos(float __x) _NOEXCEPT       {return ::cosf(__x);}
 using ::cos _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double cos(long double __x) _NOEXCEPT {return ::cosl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 cos(_A1 __x) _NOEXCEPT {return ::cos((double)__x);}
 
 // cosh
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       cosh(float __x) _NOEXCEPT       {return ::coshf(__x);}
 using ::cosh _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double cosh(long double __x) _NOEXCEPT {return ::coshl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 cosh(_A1 __x) _NOEXCEPT {return ::cosh((double)__x);}
 
 // exp
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       exp(float __x) _NOEXCEPT       {return ::expf(__x);}
 using ::exp _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double exp(long double __x) _NOEXCEPT {return ::expl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 exp(_A1 __x) _NOEXCEPT {return ::exp((double)__x);}
 
 // fabs
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       fabs(float __x) _NOEXCEPT       {return ::fabsf(__x);}
 using ::fabs _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double fabs(long double __x) _NOEXCEPT {return ::fabsl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 fabs(_A1 __x) _NOEXCEPT {return ::fabs((double)__x);}
 
 // floor
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       floor(float __x) _NOEXCEPT       {return ::floorf(__x);}
 using ::floor _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double floor(long double __x) _NOEXCEPT {return ::floorl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 floor(_A1 __x) _NOEXCEPT {return ::floor((double)__x);}
 
 // fmod
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       fmod(float __x, float __y) _NOEXCEPT             {return ::fmodf(__x, __y);}
 using ::fmod _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double fmod(long double __x, long double __y) _NOEXCEPT {return ::fmodl(__x, __y);}
 #    endif
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
 fmod(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value)), "");
     return ::fmod((__result_type)__x, (__result_type)__y);
 }
 
 // frexp
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       frexp(float __x, int* __e) _NOEXCEPT       {return ::frexpf(__x, __e);}
 using ::frexp _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double frexp(long double __x, int* __e) _NOEXCEPT {return ::frexpl(__x, __e);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 frexp(_A1 __x, int* __e) _NOEXCEPT {return ::frexp((double)__x, __e);}
 
 // ldexp
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       ldexp(float __x, int __e) _NOEXCEPT       {return ::ldexpf(__x, __e);}
 using ::ldexp _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double ldexp(long double __x, int __e) _NOEXCEPT {return ::ldexpl(__x, __e);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 ldexp(_A1 __x, int __e) _NOEXCEPT {return ::ldexp((double)__x, __e);}
 
 // log
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       log(float __x) _NOEXCEPT       {return ::logf(__x);}
 using ::log _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double log(long double __x) _NOEXCEPT {return ::logl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 log(_A1 __x) _NOEXCEPT {return ::log((double)__x);}
 
 // log10
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       log10(float __x) _NOEXCEPT       {return ::log10f(__x);}
 using ::log10 _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double log10(long double __x) _NOEXCEPT {return ::log10l(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 log10(_A1 __x) _NOEXCEPT {return ::log10((double)__x);}
 
 // modf
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       modf(float __x, float* __y) _NOEXCEPT             {return ::modff(__x, __y);}
 using ::modf _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double modf(long double __x, long double* __y) _NOEXCEPT {return ::modfl(__x, __y);}
 #    endif
 
 // pow
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       pow(float __x, float __y) _NOEXCEPT             {return ::powf(__x, __y);}
 using ::pow _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double pow(long double __x, long double __y) _NOEXCEPT {return ::powl(__x, __y);}
 #    endif
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
 pow(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value)), "");
     return ::pow((__result_type)__x, (__result_type)__y);
 }
 
 // sin
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       sin(float __x) _NOEXCEPT       {return ::sinf(__x);}
 using ::sin _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double sin(long double __x) _NOEXCEPT {return ::sinl(__x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 sin(_A1 __x) _NOEXCEPT {return ::sin((double)__x);}
 
 // sinh
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       sinh(float __x) _NOEXCEPT       {return ::sinhf(__x);}
 using ::sinh _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double sinh(long double __x) _NOEXCEPT {return ::sinhl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 sinh(_A1 __x) _NOEXCEPT {return ::sinh((double)__x);}
 
 // sqrt
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       sqrt(float __x) _NOEXCEPT       {return ::sqrtf(__x);}
 using ::sqrt _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double sqrt(long double __x) _NOEXCEPT {return ::sqrtl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 sqrt(_A1 __x) _NOEXCEPT {return ::sqrt((double)__x);}
 
 // tan
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       tan(float __x) _NOEXCEPT       {return ::tanf(__x);}
 using ::tan _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double tan(long double __x) _NOEXCEPT {return ::tanl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 tan(_A1 __x) _NOEXCEPT {return ::tan((double)__x);}
 
 // tanh
 
 #    if !defined(__sun__)
 inline _LIBCPP_HIDE_FROM_ABI float       tanh(float __x) _NOEXCEPT       {return ::tanhf(__x);}
 using ::tanh _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double tanh(long double __x) _NOEXCEPT {return ::tanhl(__x);}
 #    endif
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 tanh(_A1 __x) _NOEXCEPT {return ::tanh((double)__x);}
 
 // acosh
 
 inline _LIBCPP_HIDE_FROM_ABI float       acosh(float __x) _NOEXCEPT       {return ::acoshf(__x);}
 using ::acosh _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double acosh(long double __x) _NOEXCEPT {return ::acoshl(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 acosh(_A1 __x) _NOEXCEPT {return ::acosh((double)__x);}
 
 // asinh
 
 inline _LIBCPP_HIDE_FROM_ABI float       asinh(float __x) _NOEXCEPT       {return ::asinhf(__x);}
 using ::asinh _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double asinh(long double __x) _NOEXCEPT {return ::asinhl(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 asinh(_A1 __x) _NOEXCEPT {return ::asinh((double)__x);}
 
 // atanh
 
 inline _LIBCPP_HIDE_FROM_ABI float       atanh(float __x) _NOEXCEPT       {return ::atanhf(__x);}
 using ::atanh _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double atanh(long double __x) _NOEXCEPT {return ::atanhl(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 atanh(_A1 __x) _NOEXCEPT {return ::atanh((double)__x);}
 
 // cbrt
 
 inline _LIBCPP_HIDE_FROM_ABI float       cbrt(float __x) _NOEXCEPT       {return ::cbrtf(__x);}
 using ::cbrt _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double cbrt(long double __x) _NOEXCEPT {return ::cbrtl(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 cbrt(_A1 __x) _NOEXCEPT {return ::cbrt((double)__x);}
 
 // copysign
 
 #if __has_builtin(__builtin_copysignf)
 _LIBCPP_CONSTEXPR
 #endif
 inline _LIBCPP_HIDE_FROM_ABI float __libcpp_copysign(float __x, float __y) _NOEXCEPT {

 #endif
 }
 
 template <class _A1, class _A2>
 #if __has_builtin(__builtin_copysign)
 _LIBCPP_CONSTEXPR
 #endif
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
 __libcpp_copysign(_A1 __x, _A2 __y) _NOEXCEPT {
-    typedef typename std::__promote<_A1, _A2>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value)), "");
 #if __has_builtin(__builtin_copysign)
     return __builtin_copysign((__result_type)__x, (__result_type)__y);
 #else
     return ::copysign((__result_type)__x, (__result_type)__y);
 #endif
 }
 
 inline _LIBCPP_HIDE_FROM_ABI float copysign(float __x, float __y) _NOEXCEPT {
   return std::__libcpp_copysign(__x, __y);
 }
 
 using ::copysign _LIBCPP_USING_IF_EXISTS;
 
 inline _LIBCPP_HIDE_FROM_ABI long double copysign(long double __x, long double __y) _NOEXCEPT {
   return std::__libcpp_copysign(__x, __y);
 }
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
     copysign(_A1 __x, _A2 __y) _NOEXCEPT {
-  return std::__libcpp_copysign(__x, __y);
+  return __libcpp_copysign(__x, __y);
 }
 
 // erf
 
 inline _LIBCPP_HIDE_FROM_ABI float       erf(float __x) _NOEXCEPT       {return ::erff(__x);}
 using ::erf _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double erf(long double __x) _NOEXCEPT {return ::erfl(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 erf(_A1 __x) _NOEXCEPT {return ::erf((double)__x);}
 
 // erfc
 
 inline _LIBCPP_HIDE_FROM_ABI float       erfc(float __x) _NOEXCEPT       {return ::erfcf(__x);}
 using ::erfc _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double erfc(long double __x) _NOEXCEPT {return ::erfcl(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 erfc(_A1 __x) _NOEXCEPT {return ::erfc((double)__x);}
 
 // exp2
 
 inline _LIBCPP_HIDE_FROM_ABI float       exp2(float __x) _NOEXCEPT       {return ::exp2f(__x);}
 using ::exp2 _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double exp2(long double __x) _NOEXCEPT {return ::exp2l(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 exp2(_A1 __x) _NOEXCEPT {return ::exp2((double)__x);}
 
 // expm1
 
 inline _LIBCPP_HIDE_FROM_ABI float       expm1(float __x) _NOEXCEPT       {return ::expm1f(__x);}
 using ::expm1 _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double expm1(long double __x) _NOEXCEPT {return ::expm1l(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 expm1(_A1 __x) _NOEXCEPT {return ::expm1((double)__x);}
 
 // fdim
 
 inline _LIBCPP_HIDE_FROM_ABI float       fdim(float __x, float __y) _NOEXCEPT             {return ::fdimf(__x, __y);}
 using ::fdim _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double fdim(long double __x, long double __y) _NOEXCEPT {return ::fdiml(__x, __y);}
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
 fdim(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value)), "");
     return ::fdim((__result_type)__x, (__result_type)__y);
 }
 
 // fma
 
 inline _LIBCPP_HIDE_FROM_ABI float       fma(float __x, float __y, float __z) _NOEXCEPT
 {
 #if __has_builtin(__builtin_fmaf)
#if __has_builtin(__builtin_fmal)
     return __builtin_fmal(__x, __y, __z);
 #else
     return ::fmal(__x, __y, __z);
 #endif
 }
 
 template <class _A1, class _A2, class _A3>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value &&
-    std::is_arithmetic<_A3>::value,
-    std::__promote<_A1, _A2, _A3>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value &&
+    is_arithmetic<_A3>::value,
+    __promote<_A1, _A2, _A3>
 >::type
 fma(_A1 __x, _A2 __y, _A3 __z) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2, _A3>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value &&
-                     std::_IsSame<_A3, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2, _A3>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value &&
+                     _IsSame<_A3, __result_type>::value)), "");
 #if __has_builtin(__builtin_fma)
     return __builtin_fma((__result_type)__x, (__result_type)__y, (__result_type)__z);
 #else
     return ::fma((__result_type)__x, (__result_type)__y, (__result_type)__z);
 #endif
 }
 
 // fmax
 
 inline _LIBCPP_HIDE_FROM_ABI float       fmax(float __x, float __y) _NOEXCEPT             {return ::fmaxf(__x, __y);}
 using ::fmax _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double fmax(long double __x, long double __y) _NOEXCEPT {return ::fmaxl(__x, __y);}
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
 fmax(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value)), "");
     return ::fmax((__result_type)__x, (__result_type)__y);
 }
 
 // fmin
 
 inline _LIBCPP_HIDE_FROM_ABI float       fmin(float __x, float __y) _NOEXCEPT             {return ::fminf(__x, __y);}
 using ::fmin _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double fmin(long double __x, long double __y) _NOEXCEPT {return ::fminl(__x, __y);}
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
 fmin(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value)), "");
     return ::fmin((__result_type)__x, (__result_type)__y);
 }
 
 // hypot
 
 inline _LIBCPP_HIDE_FROM_ABI float       hypot(float __x, float __y) _NOEXCEPT             {return ::hypotf(__x, __y);}
 using ::hypot _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double hypot(long double __x, long double __y) _NOEXCEPT {return ::hypotl(__x, __y);}
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
 hypot(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value)), "");
     return ::hypot((__result_type)__x, (__result_type)__y);
 }
 
 // ilogb
 
 inline _LIBCPP_HIDE_FROM_ABI int ilogb(float __x) _NOEXCEPT       {return ::ilogbf(__x);}
 using ::ilogb _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI int ilogb(long double __x) _NOEXCEPT {return ::ilogbl(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, int>::type
+typename enable_if<is_integral<_A1>::value, int>::type
 ilogb(_A1 __x) _NOEXCEPT {return ::ilogb((double)__x);}
 
 // lgamma
 
 inline _LIBCPP_HIDE_FROM_ABI float       lgamma(float __x) _NOEXCEPT       {return ::lgammaf(__x);}
 using ::lgamma _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double lgamma(long double __x) _NOEXCEPT {return ::lgammal(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 lgamma(_A1 __x) _NOEXCEPT {return ::lgamma((double)__x);}
 
 // llrint
 
 inline _LIBCPP_HIDE_FROM_ABI long long llrint(float __x) _NOEXCEPT
 {
 #if __has_builtin(__builtin_llrintf)
     return __builtin_llrintf(__x);
#if __has_builtin(__builtin_llrintl)
     return __builtin_llrintl(__x);
 #else
     return ::llrintl(__x);
 #endif
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, long long>::type
+typename enable_if<is_integral<_A1>::value, long long>::type
 llrint(_A1 __x) _NOEXCEPT
 {
 #if __has_builtin(__builtin_llrint)
     return __builtin_llrint((double)__x);
 #else
     return ::llrint((double)__x);
 #endif
 }
#if __has_builtin(__builtin_llroundl)
     return __builtin_llroundl(__x);
 #else
     return ::llroundl(__x);
 #endif
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, long long>::type
+typename enable_if<is_integral<_A1>::value, long long>::type
 llround(_A1 __x) _NOEXCEPT
 {
 #if __has_builtin(__builtin_llround)
     return __builtin_llround((double)__x);
 #else
     return ::llround((double)__x);
 #endif
 }
 
 // log1p
 
 inline _LIBCPP_HIDE_FROM_ABI float       log1p(float __x) _NOEXCEPT       {return ::log1pf(__x);}
 using ::log1p _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double log1p(long double __x) _NOEXCEPT {return ::log1pl(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 log1p(_A1 __x) _NOEXCEPT {return ::log1p((double)__x);}
 
 // log2
 
 inline _LIBCPP_HIDE_FROM_ABI float       log2(float __x) _NOEXCEPT       {return ::log2f(__x);}
 using ::log2 _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double log2(long double __x) _NOEXCEPT {return ::log2l(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 log2(_A1 __x) _NOEXCEPT {return ::log2((double)__x);}
 
 // logb
 
 inline _LIBCPP_HIDE_FROM_ABI float       logb(float __x) _NOEXCEPT       {return ::logbf(__x);}
 using ::logb _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double logb(long double __x) _NOEXCEPT {return ::logbl(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 logb(_A1 __x) _NOEXCEPT {return ::logb((double)__x);}
 
 // lrint
 
 inline _LIBCPP_HIDE_FROM_ABI long lrint(float __x) _NOEXCEPT
 {
 #if __has_builtin(__builtin_lrintf)
     return __builtin_lrintf(__x);
#if __has_builtin(__builtin_lrintl)
     return __builtin_lrintl(__x);
 #else
     return ::lrintl(__x);
 #endif
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, long>::type
+typename enable_if<is_integral<_A1>::value, long>::type
 lrint(_A1 __x) _NOEXCEPT
 {
 #if __has_builtin(__builtin_lrint)
     return __builtin_lrint((double)__x);
 #else
     return ::lrint((double)__x);
 #endif
 }
#if __has_builtin(__builtin_lroundl)
     return __builtin_lroundl(__x);
 #else
     return ::lroundl(__x);
 #endif
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, long>::type
+typename enable_if<is_integral<_A1>::value, long>::type
 lround(_A1 __x) _NOEXCEPT
 {
 #if __has_builtin(__builtin_lround)
     return __builtin_lround((double)__x);
 #else
     return ::lround((double)__x);
 #endif
 }
 
 // nan
 
 // nearbyint
 
 inline _LIBCPP_HIDE_FROM_ABI float       nearbyint(float __x) _NOEXCEPT       {return ::nearbyintf(__x);}
 using ::nearbyint _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double nearbyint(long double __x) _NOEXCEPT {return ::nearbyintl(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 nearbyint(_A1 __x) _NOEXCEPT {return ::nearbyint((double)__x);}
 
 // nextafter
 
 inline _LIBCPP_HIDE_FROM_ABI float       nextafter(float __x, float __y) _NOEXCEPT             {return ::nextafterf(__x, __y);}
 using ::nextafter _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double nextafter(long double __x, long double __y) _NOEXCEPT {return ::nextafterl(__x, __y);}
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
 nextafter(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value)), "");
     return ::nextafter((__result_type)__x, (__result_type)__y);
 }
 
 // nexttoward
 
 inline _LIBCPP_HIDE_FROM_ABI float       nexttoward(float __x, long double __y) _NOEXCEPT       {return ::nexttowardf(__x, __y);}
 using ::nexttoward _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double nexttoward(long double __x, long double __y) _NOEXCEPT {return ::nexttowardl(__x, __y);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 nexttoward(_A1 __x, long double __y) _NOEXCEPT {return ::nexttoward((double)__x, __y);}
 
 // remainder
 
 inline _LIBCPP_HIDE_FROM_ABI float       remainder(float __x, float __y) _NOEXCEPT             {return ::remainderf(__x, __y);}
 using ::remainder _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double remainder(long double __x, long double __y) _NOEXCEPT {return ::remainderl(__x, __y);}
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
 remainder(_A1 __x, _A2 __y) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value)), "");
     return ::remainder((__result_type)__x, (__result_type)__y);
 }
 
 // remquo
 
 inline _LIBCPP_HIDE_FROM_ABI float       remquo(float __x, float __y, int* __z) _NOEXCEPT             {return ::remquof(__x, __y, __z);}
 using ::remquo _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double remquo(long double __x, long double __y, int* __z) _NOEXCEPT {return ::remquol(__x, __y, __z);}
 
 template <class _A1, class _A2>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::__enable_if_t
+typename __enable_if_t
 <
-    std::is_arithmetic<_A1>::value &&
-    std::is_arithmetic<_A2>::value,
-    std::__promote<_A1, _A2>
+    is_arithmetic<_A1>::value &&
+    is_arithmetic<_A2>::value,
+    __promote<_A1, _A2>
 >::type
 remquo(_A1 __x, _A2 __y, int* __z) _NOEXCEPT
 {
-    typedef typename std::__promote<_A1, _A2>::type __result_type;
-    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
-                     std::_IsSame<_A2, __result_type>::value)), "");
+    typedef typename __promote<_A1, _A2>::type __result_type;
+    static_assert((!(_IsSame<_A1, __result_type>::value &&
+                     _IsSame<_A2, __result_type>::value)), "");
     return ::remquo((__result_type)__x, (__result_type)__y, __z);
 }
 
 // rint
 
 inline _LIBCPP_HIDE_FROM_ABI float       rint(float __x) _NOEXCEPT
 {
 #if __has_builtin(__builtin_rintf)
#if __has_builtin(__builtin_rintl)
     return __builtin_rintl(__x);
 #else
     return ::rintl(__x);
 #endif
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 rint(_A1 __x) _NOEXCEPT
 {
 #if __has_builtin(__builtin_rint)
     return __builtin_rint((double)__x);
 #else
     return ::rint((double)__x);
 #endif
 }
#if __has_builtin(__builtin_roundl)
     return __builtin_roundl(__x);
 #else
     return ::roundl(__x);
 #endif
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 round(_A1 __x) _NOEXCEPT
 {
 #if __has_builtin(__builtin_round)
     return __builtin_round((double)__x);
 #else
     return ::round((double)__x);
 #endif
 }
 
 // scalbln
 
 inline _LIBCPP_HIDE_FROM_ABI float       scalbln(float __x, long __y) _NOEXCEPT       {return ::scalblnf(__x, __y);}
 using ::scalbln _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double scalbln(long double __x, long __y) _NOEXCEPT {return ::scalblnl(__x, __y);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 scalbln(_A1 __x, long __y) _NOEXCEPT {return ::scalbln((double)__x, __y);}
 
 // scalbn
 
 inline _LIBCPP_HIDE_FROM_ABI float       scalbn(float __x, int __y) _NOEXCEPT       {return ::scalbnf(__x, __y);}
 using ::scalbn _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double scalbn(long double __x, int __y) _NOEXCEPT {return ::scalbnl(__x, __y);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 scalbn(_A1 __x, int __y) _NOEXCEPT {return ::scalbn((double)__x, __y);}
 
 // tgamma
 
 inline _LIBCPP_HIDE_FROM_ABI float       tgamma(float __x) _NOEXCEPT       {return ::tgammaf(__x);}
 using ::tgamma _LIBCPP_USING_IF_EXISTS;
 inline _LIBCPP_HIDE_FROM_ABI long double tgamma(long double __x) _NOEXCEPT {return ::tgammal(__x);}
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 tgamma(_A1 __x) _NOEXCEPT {return ::tgamma((double)__x);}
 
 // trunc
 
 inline _LIBCPP_HIDE_FROM_ABI float       trunc(float __x) _NOEXCEPT
 {
 #if __has_builtin(__builtin_trunc)
     return __builtin_trunc(__x);
#if __has_builtin(__builtin_truncl)
     return __builtin_truncl(__x);
 #else
     return ::truncl(__x);
 #endif
 }
 
 template <class _A1>
 inline _LIBCPP_HIDE_FROM_ABI
-typename std::enable_if<std::is_integral<_A1>::value, double>::type
+typename enable_if<is_integral<_A1>::value, double>::type
 trunc(_A1 __x) _NOEXCEPT
 {
 #if __has_builtin(__builtin_trunc)
     return __builtin_trunc((double)__x);
 #else
     return ::trunc((double)__x);
 #endif
 }