Re: [Boost-Users] Query about boost type traits

From: John Maddock (john_maddock_at_[hidden])
Date: 2002-05-03 06:58:44

> I know how to use type traits to enable compile time seperate procedures,
> but not how to use it to define a procedure for some type and not others.

One way (for member functions) is to use inheritance: add an "implementation
layer" that includes the member function or not depending on whether a trait
is true or not:

template <class T, bool b>
struct mybase
{
// details
T operator*();
};

template <class T, true>
struct mybase
{
// details
};

template <class T>
struct mine : public mybase<T, ::boost::is_arithmetic<T>::value>
{
// details
};