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      1 /*
      2  * Copyright (C) 2018 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 // Generic utils similar to those from the C++ header <algorithm>.
     18 
     19 #ifndef NLP_SAFT_COMPONENTS_COMMON_MOBILE_MATH_ALGORITHM_H_
     20 #define NLP_SAFT_COMPONENTS_COMMON_MOBILE_MATH_ALGORITHM_H_
     21 
     22 #include <algorithm>
     23 #include <vector>
     24 
     25 namespace libtextclassifier3 {
     26 namespace mobile {
     27 
     28 // Returns index of max element from the vector |elements|.  Returns 0 if
     29 // |elements| is empty.  T should be a type that can be compared by operator<.
     30 template<typename T>
     31 inline int GetArgMax(const std::vector<T> &elements) {
     32   return std::distance(
     33       elements.begin(),
     34       std::max_element(elements.begin(), elements.end()));
     35 }
     36 
     37 // Returns index of min element from the vector |elements|.  Returns 0 if
     38 // |elements| is empty.  T should be a type that can be compared by operator<.
     39 template<typename T>
     40 inline int GetArgMin(const std::vector<T> &elements) {
     41   return std::distance(
     42       elements.begin(),
     43       std::min_element(elements.begin(), elements.end()));
     44 }
     45 
     46 }  // namespace mobile
     47 }  // namespace nlp_saft
     48 
     49 #endif  // NLP_SAFT_COMPONENTS_COMMON_MOBILE_MATH_ALGORITHM_H_
     50