C++: what is the optimal way to convert a double to a string?

Question

What is the most optimal way to achieve the same as this?

void foo(double floatValue, char* stringResult)
{
    sprintf(stringResult, \"%f\", floatV         


        

Answer 1

http://www.cplusplus.com/reference/iostream/stringstream/

double d=123.456;
stringstream s;
s << d; // insert d into s