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

I'm sure someone will say boost::lexical_cast, so go for that if you're using boost, but it's basically the same as this anyway:

 #include 
 #include 

 std::string doubleToString(double d)
 {
    std::ostringstream ss;
    ss << d;
    return ss.str();
 }

Note that you could easily make this into a template that works on anything that can be stream-inserted (not just doubles).