forward_like.hpp

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#pragma once
 
/// @file userver/utils/forward_like.hpp
/// @brief @copybrief utils::ForwardLike
 
#include <type_traits>
#include <utility>
 
#include <userver/compiler/impl/nodebug.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace utils {
 
// Analogue of std::forward_like from c++23.
template <typename TOwner, typename TMember>
USERVER_IMPL_NODEBUG decltype(auto) ForwardLike(TMember& member) {
    if constexpr (std::is_lvalue_reference_v<TOwner> || std::is_lvalue_reference_v<TMember>) {
        return member;
    } else {
        return std::move(member);
    }
}
 
// Analogue of std::forward_like from c++23.
template <typename TOwner, typename TMember>
USERVER_IMPL_NODEBUG decltype(auto) ForwardLike(const TMember& member) {
    return member;
}
 
}  // namespace utils
 
USERVER_NAMESPACE_END