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 | |
15 | namespace LIBC_NAMESPACE::cpp { |
16 | |
17 | // forward |
18 | template <typename T> |
19 | LIBC_INLINE constexpr T &&forward(remove_reference_t<T> &value) { |
20 | return static_cast<T &&>(value); |
21 | } |
22 | |
23 | template <typename T> |
24 | LIBC_INLINE constexpr T &&forward(remove_reference_t<T> &&value) { |
25 | static_assert(!is_lvalue_reference_v<T>, |
26 | "cannot forward an rvalue as an lvalue" ); |
27 | return static_cast<T &&>(value); |
28 | } |
29 | |
30 | } // namespace LIBC_NAMESPACE::cpp |
31 | |
32 | #endif // LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_FORWARD_H |
33 | |