Get rid of unnecessary string copies in the the keys() method #800
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Two small performance fixes for query_string class methods:
std::vector<std::string> keys()Removed unnecessary string copies in the the keys() method
according to the results of benchmarks, the performance of the method increased by 3x+ times
Constructor:
query_string(std::string params, bool url = true)Added deallocation of excessive allocated memory
vector<T>::resize()- keeps vector capacityCouple of unit-tests has been added