1// Copyright 2020 The Pigweed Authors 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); you may not 4// use this file except in compliance with the License. You may obtain a copy of 5// the License at 6// 7// https://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12// License for the specific language governing permissions and limitations under 13// the License. 14#pragma once 15 16#include <type_traits> 17 18#include "pw_polyfill/standard_library/namespace.h" 19 20_PW_POLYFILL_BEGIN_NAMESPACE_STD 21 22template <typename T> 23constexpr remove_reference_t<T>&& move(T&& object) { 24 return (remove_reference_t<T> &&) object; 25} 26 27// Forward declare these classes, which are specialized in other headers. 28template <decltype(sizeof(0)), typename> 29struct tuple_element; 30 31template <typename> 32struct tuple_size; 33 34template <typename T, T... kSequence> 35class integer_sequence; 36 37template <size_t... kSequence> 38using index_sequence = integer_sequence<decltype(sizeof(int)), kSequence...>; 39 40template <typename T, T kEnd> 41#if __has_builtin(__make_integer_seq) 42using make_integer_sequence = __make_integer_seq<integer_sequence, T, kEnd>; 43#elif __has_builtin(__integer_pack) 44using make_integer_sequence = integer_sequence<T, __integer_pack(kEnd)...>; 45#endif // make_integer_sequence 46 47template <size_t kEnd> 48using make_index_sequence = make_integer_sequence<size_t, kEnd>; 49 50struct in_place_t { 51 explicit constexpr in_place_t() = default; 52}; 53 54inline constexpr in_place_t in_place{}; 55 56_PW_POLYFILL_END_NAMESPACE_STD 57