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  1. #include <iostream>
  2. #include <map>
  3. using namespace std;
  4.  
  5. template <typename T>
  6. T default_value() { return {}; }
  7. template <>
  8. const char* default_value<const char*>() { return "default"; }
  9. template <typename T1, typename T2>
  10. T2 mapGetByKey(std::map<T1, T2>& map, T1 key, T2 defaultValue=default_value<T2>())
  11. {
  12.     auto it = map.find(key);
  13.  
  14.     if (it != map.end())
  15.     {
  16.         return it->second;
  17.     }
  18.  
  19.     return defaultValue;
  20.  
  21. };
  22. int main() {
  23.   	std::map<int, float> m1;
  24.    	std::map<int, const char*> m2;
  25.    	cout << mapGetByKey(m1, 0) << endl;
  26.    	cout << mapGetByKey(m2, 0) << endl;
  27.    	return 0;
  28. }
Success #stdin #stdout 0s 3412KB
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https://ideone.com/5R578S
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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