Disallow a specific function template instantiation

Question

I would like to define a template function but disallow instantiation with a particular type. Note that in general all types are allowed and the generic template works, I just w

Answer 1

Consider Boost disable_if and Boost TypeTraits

Take a look at How can I write a function template for all types with a particular type trait?

This is an example:

#include 
#include 

template
T convert( char const * in, 
           typename boost::disable_if, T>::type* = 0 )
{ return T(); }


int main()
{
    char const * str = "1234";

    int a = convert( str );
    double b = convert( str );
    return 0;
}

This is the compilation error for the string

double b = convert( str );

1>.\simple_no_stlport.cpp(14) : error C2770: invalid explicit template argument(s) for 'T convert(const char *,boost::disable_if,T>::type *)' 1> .\simple_no_stlport.cpp(5) : see declaration of 'convert'