1//===-- forward utility -----------------------------------------*- C++ -*-===//
 2//
 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 4// See https://llvm.org/LICENSE.txt for license information.
 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 6//
 7//===----------------------------------------------------------------------===//
 8#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_FORWARD_H
 9#define LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_FORWARD_H
10
11#include "src/__support/CPP/type_traits/is_lvalue_reference.h"
12#include "src/__support/CPP/type_traits/remove_reference.h"
13#include "src/__support/macros/attributes.h"
14#include "src/__support/macros/config.h"
15
16namespace LIBC_NAMESPACE_DECL {
17namespace cpp {
18
19// forward
20template <typename T>
21LIBC_INLINE constexpr T &&forward(remove_reference_t<T> &value) {
22  return static_cast<T &&>(value);
23}
24
25template <typename T>
26LIBC_INLINE constexpr T &&forward(remove_reference_t<T> &&value) {
27  static_assert(!is_lvalue_reference_v<T>,
28                "cannot forward an rvalue as an lvalue");
29  return static_cast<T &&>(value);
30}
31
32} // namespace cpp
33} // namespace LIBC_NAMESPACE_DECL
34
35#endif // LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_FORWARD_H