Is it possible to write a template that changes behavior depending on if a certain member function is defined on a class?
Here’s a simple example of what I would want to write:
template<class T>
std::string optionalToString(T* obj)
{
if (FUNCTION_EXISTS(T->toString))
return obj->toString();
else
return "toString not defined";
}
So, if class T
has toString()
defined, then it uses it; otherwise, it doesn’t. The magical part that I don’t know how to do is the “FUNCTION_EXISTS” part.