Precise floating-point<->string conversion

Question

I am looking for a library function to convert floating point numbers to strings, and back again, in C++. The properties I want are that str2num(num2str(x)) == x and that nu

Answer 1

I am still unable to find a library that supplies the necessary code, but I did find some code that does work:

http://svn.python.org/view/python/branches/py3k/Python/dtoa.c?view=markup

By supplying a fairly small number of defines it's easy to abstract away the Python integration. This code does indeed meet all the properties I outline.