1 /* 2 * Copyright 2024 Google LLC 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * https://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <cstddef> 20 21 #if ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L || __cplusplus >= 202002L 22 #error This trivial span.h should not be used if the platform supports std::span 23 #endif // ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L || __cplusplus >= 202002L 24 25 namespace cppbor { 26 27 template <class T> 28 class span { 29 public: span()30 constexpr span() : mBegin(nullptr), mLen(0) {} span(T * begin,size_t len)31 explicit constexpr span(T* begin, size_t len) : mBegin(begin), mLen(len) {} 32 begin()33 constexpr T* begin() const noexcept { return mBegin; } end()34 constexpr T* end() const noexcept { return mBegin + mLen; } data()35 constexpr T* data() const noexcept { return mBegin; } 36 size()37 constexpr size_t size() const noexcept { return mLen; } 38 39 private: 40 T* mBegin; 41 size_t mLen; 42 }; 43 44 } // namespace cppbor 45