Thread: Predicate definition

Does the C++ standard define an interface for a predicate?

The reason I am asking is that I have an template class (see below) where I would like to accept a predicate as an input to the constructor. How do I specify a predicate as an input argument to the constructor? I have read online that the unary_function<> base class in the standard is not intended to be an interface.

Code:

template<typename T> 
Class Myfoo
{
  Myfoo();
  ...	
}

One example I have seen online somewhere is this;

Code:

template<typename T, typename Pred>
Class Myfoo
{
  Myfoo(Pred p);
  ...	
}

but I dont really need another generic type, I want a more specific type, a predicate.

Any suggestions?