libc/src/__support/CPP/utility/in_place.h

   1 //===-- in_place 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_IN_PLACE_H
   9 #define LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_IN_PLACE_H
  10
  11 #include "src/__support/macros/attributes.h"
  12
  13 #include <stddef.h> // size_t
  14
  15 namespace LIBC_NAMESPACE::cpp {
  16
  17 // in_place
  18 struct in_place_t {
  19   explicit in_place_t() = default;
  20 };
  21 LIBC_INLINE_VAR constexpr in_place_t in_place{};
  22
  23 template <class T> struct in_place_type_t {
  24   explicit in_place_type_t() = default;
  25 };
  26 template <class T> LIBC_INLINE_VAR constexpr in_place_type_t<T> in_place_type{};
  27
  28 template <size_t I> struct in_place_index_t {
  29   explicit in_place_index_t() = default;
  30 };
  31 template <size_t I>
  32 LIBC_INLINE_VAR constexpr in_place_index_t<I> in_place_index{};
  33
  34 } // namespace LIBC_NAMESPACE::cpp
  35
  36 #endif // LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_IN_PLACE_H