Question

In C# we can define a generic type that imposes constraints on the types that can be used as the generic parameter. The following example illustrates the usage of generic constraints:

interface IFoo { }   class Foo<T> where T : IFoo { }  class Bar : IFoo { }  class Simpson { }  class Program {     static void Main(string[] args)     {         Foo<Bar> a = new Foo<Bar>();         Foo<Simpson> b = new Foo<Simpson>(); // error CS0309     } } 

Is there a way we can impose constraints for template parameters in C++.

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C++0x has native support for this but I am talking about current standard C++.

Answer 1

As someone else has mentioned, C++0x is getting this built into the language. Until then, I’d recommend Bjarne Stroustrup‘s suggestions for template constraints.

Edit: Boost also has an alternative of its own.

Edit2: Looks like concepts have been removed from C++0x.