#include "remove_reference.hpp"

Functions
template<typename T >
constexpr T &&	bsl::forward (bsl::remove_reference_t< T > &val) noexcept
	When "val" is a forwarding reference (a function argument that is declared as an rvalue reference to a cv-unqualified function template parameter), this overload forwards the argument to another function with the value category it had when passed to the calling function. More...

template<typename T >
constexpr T &&	bsl::forward (bsl::remove_reference_t< T > &&val) noexcept
	When "val" is a forwarding reference (a function argument that is declared as an rvalue reference to a cv-unqualified function template parameter), this overload forwards the argument to another function with the value category it had when passed to the calling function. 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

◆ forward() [1/2]

template<typename T >

constexpr T&& bsl::forward ( bsl::remove_reference_t< T > & val )

noexcept

When "val" is a forwarding reference (a function argument that is declared as an rvalue reference to a cv-unqualified function template parameter), this overload forwards the argument to another function with the value category it had when passed to the calling function.

#include <bsl/forward.hpp>
#include <bsl/discard.hpp>
#include <bsl/is_lvalue_reference.hpp>
#include <bsl/move.hpp>
#include <bsl/debug.hpp>
namespace bsl
{
    template<typename T>
    constexpr bool
    detector(T &&t) noexcept
    {
        bsl::discard(t);
        return bsl::is_lvalue_reference<decltype(t)>::value;
    }
    template<typename T>
    constexpr bool
    forwarder(T &&t) noexcept
    {
        return detector(bsl::forward<T>(t));
    }
    inline void
    example_forward_overview() noexcept
    {
        bsl::int32 const val1{42};
        bsl::int32 val2{val1};
        if (forwarder(val1)) {
            bsl::print() << "success\n";
        }
        if (!forwarder(bsl::move(val2))) {
            bsl::print() << "success\n";
        }
    }
}

SUPPRESSION: PRQA 4624 - false positive

We suppress this because A7-5-1 states that a function shall not return a pointer or reference to a parameter that is a const reference, and this is a false positive because this is the required definition for std::forward

Template Parameters

T	the type that defines the value being forwarded

Parameters

val	the value being forwarded

Returns: static_cast<T &&>(val)

◆ forward() [2/2]