eic-opticks/sysrap/SSortKV.hh

0001 /*
0002  * Copyright (c) 2019 Opticks Team. All Rights Reserved.
0003  *
0004  * This file is part of Opticks
0005  * (see https://bitbucket.org/simoncblyth/opticks).
0006  *
0007  * Licensed under the Apache License, Version 2.0 (the "License");
0008  * you may not use this file except in compliance with the License.
0009  * You may obtain a copy of the License at
0010  *
0011  *   http://www.apache.org/licenses/LICENSE-2.0
0012  *
0013  * Unless required by applicable law or agreed to in writing, software
0014  * distributed under the License is distributed on an "AS IS" BASIS,
0015  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0016  * See the License for the specific language governing permissions and
0017  * limitations under the License.
0018  */
0019
0020 #pragma once
0021
0022 /**
0023 SSortKV
0024 ==========
0025
0026 Utility struct for reordering a vector of string float pairs.
0027
0028 **/
0029
0030
0031 #include <map>
0032 #include <string>
0033 #include <vector>
0034 #include <algorithm>
0035 #include "SYSRAP_API_EXPORT.hh"
0036
0037 struct SYSRAP_API SSortKV
0038 {
0039     typedef std::pair<std::string, float> KV ;
0040     typedef std::vector<KV> VKV ;
0041
0042     SSortKV(bool descending_) : descending(descending_) {}
0043
0044     void add(const char* k, float v)
0045     {
0046         vkv.push_back(KV(k, v));
0047     }
0048     void sort()
0049     {
0050         std::sort(vkv.begin(), vkv.end(), *this );
0051     }
0052     void dump(const char* msg="SSortKV::dump") const ;
0053
0054     bool operator()( const KV& a, const KV& b) const
0055     {
0056         return descending ? a.second > b.second : a.second < b.second ;
0057     }
0058     unsigned getNum() const
0059     {
0060         return vkv.size();
0061     }
0062     const std::string& getKey(unsigned i) const
0063     {
0064         return vkv[i].first ;
0065     }
0066     float getVal(unsigned i) const
0067     {
0068         return vkv[i].second ;
0069     }
0070
0071     VKV   vkv ;
0072     bool  descending ;
0073
0074 };
0075