[NFC][libc++][test] Uses public functions.

[Mordante]

Summary

Replaces std::__format_context_create with the public wrapper
test_format_context_create.

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.handle.pass.cpp

 #include <array>
 #include <cassert>
 #include <cmath>
 #include <charconv>
 #include <concepts>
 #include <string>
 #include <type_traits>
 
+#include "test_format_context.h"
 #include "test_macros.h"
 
 enum class color { black, red, gold };
 const char* color_names[] = {"black", "red", "gold"};
 
 template <>
 struct std::formatter<color> : std::formatter<const char*> {
   auto format(color c, auto& ctx) { return formatter<const char*>::format(color_names[static_cast<int>(c)], ctx); }
 };
 
 void test(std::string expected, std::string_view fmt, color arg) {
   auto parse_ctx = std::format_parse_context(fmt);
   std::formatter<color, char> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
   assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
 
   std::string result;
   auto out = std::back_inserter(result);
   using FormatCtxT = std::basic_format_context<decltype(out), char>;
 
-  auto format_ctx = std::__format_context_create<decltype(out), char>(out, std::make_format_args<FormatCtxT>(arg));
+  std::basic_format_context format_ctx =
+      test_format_context_create<decltype(out), char>(out, std::make_format_args<FormatCtxT>(arg));
   formatter.format(arg, format_ctx);
   assert(result == expected);
 }
 
 void test_termination_condition(std::string expected, std::string f, color arg) {
   // The format-spec is valid if completely consumed or terminates at a '}'.
   // The valid inputs all end with a '}'. The test is executed twice:
   // - first with the terminating '}',

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.bool.pass.cpp

 //
 // This file tests with `ArithmeticT = bool`, for each valid `charT`.
 
 #include <format>
 #include <cassert>
 #include <concepts>
 #include <type_traits>
 
+#include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
 
 #define STR(S) MAKE_STRING(CharT, S)
 
 template <class StringT, class StringViewT>
 void test(StringT expected, StringViewT fmt, bool arg) {
   using CharT = typename StringT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<bool, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
   assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
 
   StringT result;
   auto out = std::back_inserter(result);
   using FormatCtxT = std::basic_format_context<decltype(out), CharT>;
 
-  auto format_ctx = std::__format_context_create<decltype(out), CharT>(
-      out, std::make_format_args<FormatCtxT>(arg));
+  std::basic_format_context format_ctx =
+      test_format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(arg));
   formatter.format(arg, format_ctx);
   assert(result == expected);
 }
 
 template <class StringT>
 void test_termination_condition(StringT expected, StringT f, bool arg) {
   // The format-spec is valid if completely consumed or terminates at a '}'.
   // The valid inputs all end with a '}'. The test is executed twice:

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.c_string.pass.cpp

 //   template<> struct formatter<charT*, charT>;
 //   template<> struct formatter<const charT*, charT>;
 
 #include <format>
 #include <cassert>
 #include <concepts>
 #include <type_traits>
 
+#include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
 
 #define STR(S) MAKE_STRING(CharT, S)
 #define CSTR(S) MAKE_CSTRING(CharT, S)
 
 template <class T, class StringT, class StringViewT, class CharT>
 void test(StringT expected, StringViewT fmt, const CharT* a) {
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<T, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
   assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
 
   StringT result;
   auto out = std::back_inserter(result);
   using FormatCtxT = std::basic_format_context<decltype(out), CharT>;
 
   auto* arg = const_cast<T>(a);
-  auto format_ctx = std::__format_context_create<decltype(out), CharT>(
-      out, std::make_format_args<FormatCtxT>(arg));
+  std::basic_format_context format_ctx =
+      test_format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(arg));
   formatter.format(arg, format_ctx);
   assert(result == expected);
 }
 
 template <class ArgumentT, class StringT, class CharT>
 void test_termination_condition(StringT expected, StringT f, const CharT* arg) {
   // The format-spec is valid if completely consumed or terminates at a '}'.
   // The valid inputs all end with a '}'. The test is executed twice:

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char.pass.cpp

 //   template<> struct formatter<char, wchar_t>;
 //   template<> struct formatter<wchar_t, wchar_t>;
 
 #include <format>
 #include <cassert>
 #include <concepts>
 #include <type_traits>
 
+#include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
 
 #define STR(S) MAKE_STRING(CharT, S)
 
 template <class StringT, class StringViewT, class ArgumentT>
 void test(StringT expected, StringViewT fmt, ArgumentT arg) {
   using CharT = typename StringT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<ArgumentT, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
   assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
 
   StringT result;
   auto out = std::back_inserter(result);
   using FormatCtxT = std::basic_format_context<decltype(out), CharT>;
 
-  auto format_ctx = std::__format_context_create<decltype(out), CharT>(
-      out, std::make_format_args<FormatCtxT>(arg));
+  std::basic_format_context format_ctx =
+      test_format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(arg));
   formatter.format(arg, format_ctx);
   assert(result == expected);
 }
 
 template <class StringT, class ArgumentT>
 void test_termination_condition(StringT expected, StringT f, ArgumentT arg) {
   // The format-spec is valid if completely consumed or terminates at a '}'.
   // The valid inputs all end with a '}'. The test is executed twice:

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char_array.pass.cpp

 //   BasicFormatter requirements ([formatter.requirements]) for each Ti in
 //   Args.
 
 #include <format>
 #include <cassert>
 #include <concepts>
 #include <type_traits>
 
+#include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
 
 #define STR(S) MAKE_STRING(CharT, S)
 #define CSTR(S) MAKE_CSTRING(CharT, S)
 
 // This is based on the method found in
 // clang/test/CXX/temp/temp.arg/temp.arg.nontype/p1-cxx20.cpp
void test(const std::basic_string<CharT>& expected, const std::basic_string_view<CharT>& fmt) const {
     std::basic_string<CharT> result;
     auto out = std::back_inserter(result);
     using FormatCtxT = std::basic_format_context<decltype(out), CharT>;
 
     std::basic_string<CharT> buffer{text, text + N};
     // Note not too found of this hack
     Str* data = reinterpret_cast<Str*>(const_cast<CharT*>(buffer.c_str()));
 
-    auto format_ctx = std::__format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(*data));
+    std::basic_format_context format_ctx =
+        test_format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(*data));
     formatter.format(*data, format_ctx);
     assert(result == expected);
   }
 
   template <class CharT>
   void test_termination_condition(const std::basic_string<CharT>& expected, const std::basic_string<CharT>& f) const {
     // The format-spec is valid if completely consumed or terminates at a '}'.
     // The valid inputs all end with a '}'. The test is executed twice:

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.const_char_array.pass.cpp

 // For each `charT`, the string type specializations
 //   template<size_t N> struct formatter<const charT[N], charT>;
 
 #include <format>
 #include <cassert>
 #include <concepts>
 #include <type_traits>
 
+#include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
 
 #define STR(S) MAKE_STRING(CharT, S)
 #define CSTR(S) MAKE_CSTRING(CharT, S)
 
 // This is based on the method found in
 // clang/test/CXX/temp/temp.arg/temp.arg.nontype/p1-cxx20.cpp
void test(const std::basic_string<CharT>& expected,
     std::basic_string<CharT> result;
     auto out = std::back_inserter(result);
     using FormatCtxT = std::basic_format_context<decltype(out), CharT>;
 
     std::basic_string<CharT> buffer{text, text + N};
     // Note not too found of this hack
     Str* data = reinterpret_cast<Str*>(buffer.c_str());
 
-    auto format_ctx = std::__format_context_create<decltype(out), CharT>(
-        out, std::make_format_args<FormatCtxT>(*data));
+    std::basic_format_context format_ctx =
+        test_format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(*data));
     formatter.format(*data, format_ctx);
     assert(result == expected);
   }
 
   template <class CharT>
   void test_termination_condition(const std::basic_string<CharT>& expected,
                                   const std::basic_string<CharT>& f) const {
     // The format-spec is valid if completely consumed or terminates at a '}'.

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp

 #include <array>
 #include <cassert>
 #include <cmath>
 #include <charconv>
 #include <concepts>
 #include <string>
 #include <type_traits>
 
+#include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
 
 #define STR(S) MAKE_STRING(CharT, S)
 
 template <class CharT, class ArithmeticT>
 void test(std::basic_string_view<CharT> fmt, ArithmeticT arg, std::basic_string<CharT> expected) {
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<ArithmeticT, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
   assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
 
   std::basic_string<CharT> result;
   auto out = std::back_inserter(result);
   using FormatCtxT = std::basic_format_context<decltype(out), CharT>;
 
-  auto format_ctx = std::__format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(arg));
+  std::basic_format_context format_ctx =
+      test_format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(arg));
   formatter.format(arg, format_ctx);
 
   if (expected.empty()) {
     std::array<char, 128> buffer;
     expected.append(buffer.begin(), std::to_chars(buffer.begin(), buffer.end(), arg).ptr);
   }
 
   assert(result == expected);

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.pointer.pass.cpp

 #include <array>
 #include <cassert>
 #include <cmath>
 #include <charconv>
 #include <concepts>
 #include <string>
 #include <type_traits>
 
+#include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
 
 #define STR(S) MAKE_STRING(CharT, S)
 
 template <class StringT, class StringViewT, class PointerT>
 void test(StringT expected, StringViewT fmt, PointerT arg) {
   using CharT = typename StringT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<PointerT, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
   assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
 
   StringT result;
   auto out = std::back_inserter(result);
   using FormatCtxT = std::basic_format_context<decltype(out), CharT>;
 
-  auto format_ctx = std::__format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(arg));
+  std::basic_format_context format_ctx =
+      test_format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(arg));
   formatter.format(arg, format_ctx);
 
   if (expected.empty()) {
     std::array<char, 128> buffer;
     buffer[0] = CharT('0');
     buffer[1] = CharT('x');
     expected.append(buffer.begin(),
                     std::to_chars(buffer.begin() + 2, buffer.end(), reinterpret_cast<uintptr_t>(arg), 16).ptr);

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.signed_integral.pass.cpp

 // - long long
 // - __int128_t
 
 #include <format>
 #include <cassert>
 #include <concepts>
 #include <type_traits>
 
+#include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
 
 #define STR(S) MAKE_STRING(CharT, S)
 
 template <class StringT, class StringViewT, class ArithmeticT>
 void test(StringT expected, StringViewT fmt, ArithmeticT arg) {
   using CharT = typename StringT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<ArithmeticT, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
   assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
 
   StringT result;
   auto out = std::back_inserter(result);
   using FormatCtxT = std::basic_format_context<decltype(out), CharT>;
 
-  auto format_ctx = std::__format_context_create<decltype(out), CharT>(
-      out, std::make_format_args<FormatCtxT>(arg));
+  std::basic_format_context format_ctx =
+      test_format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(arg));
   formatter.format(arg, format_ctx);
   assert(result == expected);
 }
 
 template <class StringT, class ArithmeticT>
 void test_termination_condition(StringT expected, StringT f, ArithmeticT arg) {
   // The format-spec is valid if completely consumed or terminates at a '}'.
   // The valid inputs all end with a '}'. The test is executed twice:

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.string.pass.cpp

 //   template<class traits>
 //     struct formatter<basic_string_view<charT, traits>, charT>;
 
 #include <format>
 #include <cassert>
 #include <concepts>
 #include <type_traits>
 
+#include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
 
 #define STR(S) MAKE_STRING(CharT, S)
 #define CSTR(S) MAKE_CSTRING(CharT, S)
 
 template <class T, class ArgumentT, class StringT, class StringViewT>
 void test(StringT expected, StringViewT fmt, StringT a) {
void test(StringT expected, StringViewT fmt, StringT a) {
   auto it = formatter.parse(parse_ctx);
   assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
 
   StringT result;
   auto out = std::back_inserter(result);
   using FormatCtxT = std::basic_format_context<decltype(out), CharT>;
 
   ArgumentT arg = a;
-  auto format_ctx = std::__format_context_create<decltype(out), CharT>(
+  std::basic_format_context format_ctx = test_format_context_create<decltype(out), CharT>(
       out, std::make_format_args<FormatCtxT>(std::forward<ArgumentT>(arg)));
   formatter.format(arg, format_ctx);
   assert(result == expected);
 }
 
 template <class T, class ArgumentT, class StringT>
 void test_termination_condition(StringT expected, StringT f, StringT arg) {
   // The format-spec is valid if completely consumed or terminates at a '}'.

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.unsigned_integral.pass.cpp

 // - unsigned long long
 // - __uint128_t
 
 #include <format>
 #include <cassert>
 #include <concepts>
 #include <type_traits>
 
+#include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
 
 #define STR(S) MAKE_STRING(CharT, S)
 
 template <class StringT, class StringViewT, class ArithmeticT>
 void test(StringT expected, StringViewT fmt, ArithmeticT arg) {
   using CharT = typename StringT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<ArithmeticT, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
   assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
 
   StringT result;
   auto out = std::back_inserter(result);
   using FormatCtxT = std::basic_format_context<decltype(out), CharT>;
 
-  auto format_ctx = std::__format_context_create<decltype(out), CharT>(
-      out, std::make_format_args<FormatCtxT>(arg));
+  std::basic_format_context format_ctx =
+      test_format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(arg));
   formatter.format(arg, format_ctx);
   assert(result == expected);
 }
 
 template <class StringT, class ArithmeticT>
 void test_termination_condition(StringT expected, StringT f, ArithmeticT arg) {
   // The format-spec is valid if completely consumed or terminates at a '}'.
   // The valid inputs all end with a '}'. The test is executed twice:

libcxx/test/support/test_format_context.h

  * required object.
  *
  * @note This requires every standard library implementation to write their own
  * helper function. Vendors are encouraged to file a review at
  * https://reviews.llvm.org/ so their specific implementation can be part of
  * this file.
  */
 
+#include "test_macros.h"
+
 #if TEST_STD_VER < 20
 #error "The format header requires at least C++20"
 #endif
 
 #include <format>
 
 #ifndef _LIBCPP_HAS_NO_LOCALIZATION
 #include <locale>