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  1. #include <iostream>
  2. #include <map>
  3.  
  4. template <typename MapType>
  5. class map_add_values {
  6. private:
  7.     MapType mMap;
  8. public:
  9.     typedef typename MapType::key_type KeyType;
  10.     typedef typename MapType::mapped_type MappedType;
  11.  
  12.     map_add_values(const KeyType& key, const MappedType& val)
  13.     {
  14.         mMap[key] = val;
  15.     }
  16.  
  17.     map_add_values& operator()(const KeyType& key, const MappedType& val) {
  18.         mMap[key] = val;
  19.         return *this;
  20.     }
  21.  
  22.     void to (MapType& map) {
  23.         map.insert(mMap.begin(), mMap.end());
  24.     }
  25. };
  26.  
  27. typedef std::map<int, int> Int2IntMap;
  28.  
  29. void printMap(const Int2IntMap& map) {
  30.     std::cout << "Contents of Map" << std::endl;
  31.     std::cout << "===============" << std::endl;
  32.     Int2IntMap::const_iterator mapIterator = map.begin(),
  33.         mapIteratorEnd = map.end();
  34.     while (mapIterator != mapIteratorEnd) {
  35.         std::cout << "(" << mapIterator->first << ", " << mapIterator->second << ")" << std::endl;
  36.         ++mapIterator;
  37.     }
  38.     std::cout << std::endl;
  39. }
  40.  
  41. int main() {
  42.     Int2IntMap testMap;
  43.     map_add_values<Int2IntMap>(1,2)(3,4)(5,6).to(testMap);
  44.     printMap(testMap);
  45.     map_add_values<Int2IntMap>(10,20)(30,40)(50,60).to(testMap);
  46.     printMap(testMap);
  47. }
Success #stdin #stdout 0s 3032KB
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stdin
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Standard input is empty
stdout
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Contents of Map
===============
(1, 2)
(3, 4)
(5, 6)

Contents of Map
===============
(1, 2)
(3, 4)
(5, 6)
(10, 20)
(30, 40)
(50, 60)
https://ideone.com/3uYJiH
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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