move_if_noexcept.hpp File Reference

#include "conditional.hpp"
#include "is_copy_constructible.hpp"
#include "is_nothrow_move_constructible.hpp"
#include "move.hpp"

Go to the source code of this file.

Functions
template<typename T >
constexpr conditional_t< !is_nothrow_move_constructible< T >::value &&is_copy_constructible< T >::value, T const &, T && >	bsl::move_if_noexcept (T &val) noexcept
	move_if_noexcept obtains an rvalue reference to its argument if its move constructor does not throw exceptions or if there is no copy constructor (move-only type), otherwise obtains an lvalue reference to its argument. It is typically used to combine move semantics with strong exception guarantee. More...

Detailed Description

Copyright

Copyright (C) 2020 Assured Information Security, Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Function Documentation

move_if_noexcept()

template<typename T >

constexpr conditional_t< !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value, T const &, T &&> bsl::move_if_noexcept ( T &  val )

noexcept

move_if_noexcept obtains an rvalue reference to its argument if its move constructor does not throw exceptions or if there is no copy constructor (move-only type), otherwise obtains an lvalue reference to its argument. It is typically used to combine move semantics with strong exception guarantee.

#include <bsl/move_if_noexcept.hpp>
#include <bsl/debug.hpp>

namespace bsl
{
    inline void
    example_move_if_noexcept_overview() noexcept
    {
        bool val1{true};
        bool const &&val2{bsl::move_if_noexcept(val1)};

        if (val2) {
            bsl::print() << "success\n";
        }
    }
}

Template Parameters

T	the type that defines the value being moved

Parameters

val	the value being moved

Returns

std::move(val) or val, depending on exception guarantees.