chromium/third_party/libc++/src/include/__exception/exception_ptr.h

//===----------------------------------------------------------------------===//
//
// 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_PTR_H
#define _LIBCPP___EXCEPTION_EXCEPTION_PTR_H

#include <__config>
#include <__exception/operations.h>
#include <__memory/addressof.h>
#include <__memory/construct_at.h>
#include <__type_traits/decay.h>
#include <cstddef>
#include <cstdlib>
#include <new>
#include <typeinfo>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

#ifndef _LIBCPP_ABI_MICROSOFT

#  if _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION

namespace __cxxabiv1 {

extern "C" {
_LIBCPP_OVERRIDABLE_FUNC_VIS void* __cxa_allocate_exception(size_t) throw();
_LIBCPP_OVERRIDABLE_FUNC_VIS void __cxa_free_exception(void*) throw();

struct __cxa_exception;
_LIBCPP_OVERRIDABLE_FUNC_VIS __cxa_exception* __cxa_init_primary_exception(
    void*,
    std::type_info*,
#    if defined(_WIN32)
    void(__thiscall*)(void*)) throw();
#    elif defined(__wasm__)
    // In Wasm, a destructor returns its argument
    void* (*)(void*)) throw();
#    else
    void (*)(void*)) throw();
#    endif
}

} // namespace __cxxabiv1

#  endif

#endif

namespace std { // purposefully not using versioning namespace

#ifndef _LIBCPP_ABI_MICROSOFT

class _LIBCPP_EXPORTED_FROM_ABI exception_ptr { … };

template <class _Ep>
_LIBCPP_HIDE_FROM_ABI exception_ptr make_exception_ptr(_Ep __e) _NOEXCEPT { … }

#else // _LIBCPP_ABI_MICROSOFT

class _LIBCPP_EXPORTED_FROM_ABI exception_ptr {
  _LIBCPP_DIAGNOSTIC_PUSH
  _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wunused-private-field")
  void* __ptr1_;
  void* __ptr2_;
  _LIBCPP_DIAGNOSTIC_POP

public:
  exception_ptr() _NOEXCEPT;
  exception_ptr(nullptr_t) _NOEXCEPT;
  exception_ptr(const exception_ptr& __other) _NOEXCEPT;
  exception_ptr& operator=(const exception_ptr& __other) _NOEXCEPT;
  exception_ptr& operator=(nullptr_t) _NOEXCEPT;
  ~exception_ptr() _NOEXCEPT;
  explicit operator bool() const _NOEXCEPT;
};

_LIBCPP_EXPORTED_FROM_ABI bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT;

inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT {
  return !(__x == __y);
}

_LIBCPP_EXPORTED_FROM_ABI void swap(exception_ptr&, exception_ptr&) _NOEXCEPT;

_LIBCPP_EXPORTED_FROM_ABI exception_ptr __copy_exception_ptr(void* __except, const void* __ptr);
_LIBCPP_EXPORTED_FROM_ABI exception_ptr current_exception() _NOEXCEPT;
_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void rethrow_exception(exception_ptr);

// This is a built-in template function which automagically extracts the required
// information.
template <class _E>
void* __GetExceptionInfo(_E);

template <class _Ep>
_LIBCPP_HIDE_FROM_ABI exception_ptr make_exception_ptr(_Ep __e) _NOEXCEPT {
  return __copy_exception_ptr(std::addressof(__e), __GetExceptionInfo(__e));
}

#endif // _LIBCPP_ABI_MICROSOFT
} // namespace std

#endif // _LIBCPP___EXCEPTION_EXCEPTION_PTR_H