1 //===----------------------------------------------------------------------===// 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 SUPPORT_TEST_CONSTEXPR_CONTAINER_H 9 #define SUPPORT_TEST_CONSTEXPR_CONTAINER_H 10 11 // A dummy container with enough constexpr support to test the standard 12 // insert iterators, such as `back_insert_iterator`. 13 14 #include <algorithm> 15 #include <cassert> 16 #include <utility> 17 18 #include "test_macros.h" 19 20 #if TEST_STD_VER >= 14 21 22 template<class T, int N> 23 class ConstexprFixedCapacityDeque { 24 T data_[N]; 25 int size_ = 0; 26 public: 27 using value_type = T; 28 using iterator = T *; 29 using const_iterator = T const *; 30 31 constexpr ConstexprFixedCapacityDeque() = default; begin()32 constexpr iterator begin() { return data_; } end()33 constexpr iterator end() { return data_ + size_; } begin()34 constexpr const_iterator begin() const { return data_; } end()35 constexpr const_iterator end() const { return data_ + size_; } size()36 constexpr size_t size() const { return size_; } front()37 constexpr const T& front() const { assert(size_ >= 1); return data_[0]; } back()38 constexpr const T& back() const { assert(size_ >= 1); return data_[size_-1]; } 39 insert(const_iterator pos,T t)40 constexpr iterator insert(const_iterator pos, T t) { 41 int i = static_cast<int>(pos - data_); 42 if (i != size_) { 43 std::move_backward(data_ + i, data_ + size_, data_ + size_ + 1); 44 } 45 data_[i] = std::move(t); 46 size_ += 1; 47 return data_ + i; 48 } 49 push_back(T t)50 constexpr void push_back(T t) { insert(end(), std::move(t)); } push_front(T t)51 constexpr void push_front(T t) { insert(begin(), std::move(t)); } 52 }; 53 54 #endif // TEST_STD_VER >= 14 55 56 #endif // SUPPORT_TEST_CONSTEXPR_CONTAINER_H 57