CPP
CPP
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std::stod

std::stof, std::stod, std::stold

Defined in header <string> 
float       stof( const std::string& str, std::size_t* pos = 0 );
float       stof( const std::wstring& str, std::size_t* pos = 0 );
 (1) (since C++11) 
double      stod( const std::string& str, std::size_t* pos = 0 );
double      stod( const std::wstring& str, std::size_t* pos = 0 );
 (2) (since C++11) 
long double stol