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Differential D145095 Diff 504471 libcxx/include/__exception/exception.h

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libcxx/include/__exception/exception.h

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___EXCEPTION_EXCEPTION_H
#define _LIBCPP___EXCEPTION_EXCEPTION_H
#include <__config>
// <vcruntime_exception.h> defines its own std::exception and std::bad_exception types,
// which we use in order to be ABI-compatible with other STLs on Windows.
#if defined(_LIBCPP_ABI_VCRUNTIME)
# include <vcruntime_exception.h>
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
namespace std { // purposefully not using versioning namespace
ldionneUnsubmitted
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In all headers, please keep the comments about the non-versioned namespace being used on purpose.

ldionne: In all headers, please keep the comments about the non-versioned namespace being used on…
#if defined(_LIBCPP_ABI_VCRUNTIME) && (!defined(_HAS_EXCEPTIONS) || _HAS_EXCEPTIONS != 0)
// The std::exception class was already included above, but we're explicit about this condition here for clarity.
#elif defined(_LIBCPP_ABI_VCRUNTIME) && _HAS_EXCEPTIONS == 0
// However, <vcruntime_exception.h> does not define std::exception and std::bad_exception
// when _HAS_EXCEPTIONS == 0.
//
// Since libc++ still wants to provide the std::exception hierarchy even when _HAS_EXCEPTIONS == 0
// (after all those are simply types like any other), we define an ABI-compatible version
// of the VCRuntime std::exception and std::bad_exception types in that mode.
struct __std_exception_data {
char const* _What;
bool _DoFree;
};
class exception { // base of all library exceptions
public:
exception() _NOEXCEPT : __data_() {}
explicit exception(char const* __message) _NOEXCEPT : __data_() {
__data_._What = __message;
__data_._DoFree = true;
}
exception(exception const&) _NOEXCEPT {}
exception& operator=(exception const&) _NOEXCEPT { return *this; }
virtual ~exception() _NOEXCEPT {}
virtual char const* what() const _NOEXCEPT { return __data_._What ? __data_._What : "Unknown exception"; }
private:
__std_exception_data __data_;
};
class bad_exception : public exception {
public:
bad_exception() _NOEXCEPT : exception("bad exception") {}
};
#else // !defined(_LIBCPP_ABI_VCRUNTIME)
// On all other platforms, we define our own std::exception and std::bad_exception types
// regardless of whether exceptions are turned on as a language feature.
class _LIBCPP_EXCEPTION_ABI exception {
public:
_LIBCPP_HIDE_FROM_ABI exception() _NOEXCEPT {}
_LIBCPP_HIDE_FROM_ABI exception(const exception&) _NOEXCEPT = default;
virtual ~exception() _NOEXCEPT;
virtual const char* what() const _NOEXCEPT;
};
class _LIBCPP_EXCEPTION_ABI bad_exception : public exception {
public:
_LIBCPP_HIDE_FROM_ABI bad_exception() _NOEXCEPT {}
~bad_exception() _NOEXCEPT override;
const char* what() const _NOEXCEPT override;
};
#endif // !_LIBCPP_ABI_VCRUNTIME
} // namespace std
#endif // _LIBCPP___EXCEPTION_EXCEPTION_H