Sliwa, Przemyslaw (London) wrote:
I would like to write a template which depending on the argument type
does different things.
For example the pseudo code:
template
foo(T& nT, C& nC)
{
// common code;
if(T==C)
// specific code;
.....
// again common code;
}
Can the template meta programming help me in this case?
It may. It depends on whether "specific code" compiles when T!=C. If it
does, you could do this:
template
void foo(T& nT, C& nC)
{
// common code
if(boost::is_same::value)
{ /* specific code */ }
// again common code
}
where is is_same<> is defined in boost/type_traits/is_same.hpp. If
"specific code" doesn't compile when T!=C, you need to get fancier. An
overloaded helper function is the way to go:
template
void specific_code(T&, C&) {}
template<class T>
void specific_code(T&, T&)
{
// specific code here
}
template
void foo(T& nT, C& nC)
{
// common code
specific_code(nT, nC);
// again common code
}
HTH,
--
Eric Niebler
Boost Consulting
www.boost-consulting.com
