chromium/third_party/libc++/src/include/__exception/nested_exception.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_NESTED_EXCEPTION_H
#define _LIBCPP___EXCEPTION_NESTED_EXCEPTION_H

#include <__config>
#include <__exception/exception_ptr.h>
#include <__memory/addressof.h>
#include <__type_traits/decay.h>
#include <__type_traits/is_base_of.h>
#include <__type_traits/is_class.h>
#include <__type_traits/is_constructible.h>
#include <__type_traits/is_convertible.h>
#include <__type_traits/is_final.h>
#include <__type_traits/is_polymorphic.h>
#include <__utility/forward.h>
#include <cstddef>

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

namespace std { // purposefully not using versioning namespace

class _LIBCPP_EXPORTED_FROM_ABI nested_exception { … };

template <class _Tp>
struct __nested : public _Tp, public nested_exception { … };

#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
template <class _Tp, class _Up, bool>
struct __throw_with_nested;

template <class _Tp, class _Up>
struct __throw_with_nested<_Tp, _Up, true> {
  _LIBCPP_NORETURN static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) {
    throw __nested<_Up>(std::forward<_Tp>(__t));
  }
};

template <class _Tp, class _Up>
struct __throw_with_nested<_Tp, _Up, false> {
  _LIBCPP_NORETURN static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) { throw std::forward<_Tp>(__t); }
};
#endif

template <class _Tp>
_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void throw_with_nested(_Tp&& __t) { … }

template <class _From, class _To>
struct __can_dynamic_cast
    : _BoolConstant< is_polymorphic<_From>::value &&
                     (!is_base_of<_To, _From>::value || is_convertible<const _From*, const _To*>::value)> { … };

template <class _Ep, __enable_if_t< __can_dynamic_cast<_Ep, nested_exception>::value, int> = 0>
inline _LIBCPP_HIDE_FROM_ABI void rethrow_if_nested(const _Ep& __e) { … }

template <class _Ep, __enable_if_t<!__can_dynamic_cast<_Ep, nested_exception>::value, int> = 0>
inline _LIBCPP_HIDE_FROM_ABI void rethrow_if_nested(const _Ep&) { … }

} // namespace std

#endif // _LIBCPP___EXCEPTION_NESTED_EXCEPTION_H