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" // LIBC_INLINE, LIBC_INLINE_VAR
  12 #include "src/__support/macros/config.h"
  13
  14 #include <stddef.h> // size_t
  15
  16 namespace LIBC_NAMESPACE_DECL {
  17 namespace cpp {
  18
  19 // in_place
  20 struct in_place_t {
  21   LIBC_INLINE explicit in_place_t() = default;
  22 };
  23 LIBC_INLINE_VAR constexpr in_place_t in_place{};
  24
  25 template <class T> struct in_place_type_t {
  26   LIBC_INLINE explicit in_place_type_t() = default;
  27 };
  28 template <class T> LIBC_INLINE_VAR constexpr in_place_type_t<T> in_place_type{};
  29
  30 template <size_t IDX> struct in_place_index_t {
  31   LIBC_INLINE explicit in_place_index_t() = default;
  32 };
  33 template <size_t IDX>
  34 LIBC_INLINE_VAR constexpr in_place_index_t<IDX> in_place_index{};
  35
  36 } // namespace cpp
  37 } // namespace LIBC_NAMESPACE_DECL
  38
  39 #endif // LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_IN_PLACE_H