(C++) IsKeyInMap

 

IsKeyInMap is a std::map check code snippet to find out if a certain key is in a std::map.

 

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#include <cassert> #include <map> #include <string> const std::map<int,std::string> GetNumberMap() {   std::map<int,std::string> numberMap;   numberMap[0] = "Zero";   numberMap[1] = "One";   numberMap[2] = "Two";   //Etcetera   return numberMap; } template <class KeyType, class ValueType> bool IsKeyInMap(const std::map<KeyType,ValueType>& anyMap, const KeyType& key) {   return anyMap.find(key) != anyMap.end(); } int main() {   const std::map<int,std::string> myMap(GetNumberMap());   assert(!IsKeyInMap(myMap,-2));   assert(!IsKeyInMap(myMap,-1));   assert( IsKeyInMap(myMap,0));   assert( IsKeyInMap(myMap,1));   assert( IsKeyInMap(myMap,2)); }