1 /* 2 * Copyright (C) 2017 The Android Open Source Project 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 * http://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 #ifndef LIBTEXTCLASSIFIER_COMMON_VECTOR_SPAN_H_ 18 #define LIBTEXTCLASSIFIER_COMMON_VECTOR_SPAN_H_ 19 20 #include <vector> 21 22 namespace libtextclassifier { 23 24 // StringPiece analogue for std::vector<T>. 25 template <class T> 26 class VectorSpan { 27 public: VectorSpan()28 VectorSpan() : begin_(), end_() {} VectorSpan(const std::vector<T> & v)29 VectorSpan(const std::vector<T>& v) // NOLINT(runtime/explicit) 30 : begin_(v.begin()), end_(v.end()) {} VectorSpan(typename std::vector<T>::const_iterator begin,typename std::vector<T>::const_iterator end)31 VectorSpan(typename std::vector<T>::const_iterator begin, 32 typename std::vector<T>::const_iterator end) 33 : begin_(begin), end_(end) {} 34 35 const T& operator[](typename std::vector<T>::size_type i) const { 36 return *(begin_ + i); 37 } 38 size()39 int size() const { return end_ - begin_; } begin()40 typename std::vector<T>::const_iterator begin() const { return begin_; } end()41 typename std::vector<T>::const_iterator end() const { return end_; } 42 43 private: 44 typename std::vector<T>::const_iterator begin_; 45 typename std::vector<T>::const_iterator end_; 46 }; 47 48 } // namespace libtextclassifier 49 50 #endif // LIBTEXTCLASSIFIER_COMMON_VECTOR_SPAN_H_ 51