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

The best thing to do would be to build a simple templatized function to convert any streamable type into a string. Here's the way I do it:

#include 
#include 

template 
const std::string to_string(const T& data)
{
   std::ostringstream conv;
   conv << data;
   return conv.str();
}

If you want a const char* representation, simply substitute conv.str().c_str() in the above.