模板约束C ++ [英] Template Constraints C++

问题描述

在C＃中，我们可以定义一个泛型类型，对可以用作泛型参数的类型强加约束。以下示例说明了通用约束的用法：

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
    }
}

在C ++中模板参数的约束。

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

C ++ 0x本地支持这个，但我说的是当前的标准C ++ 。

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

推荐答案

正如别人已经提到的，C ++ 0x正在将这个内置于语言中。在此之前，我建议您 Bjarne Stroustrup 的模板约束建议。

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.

编辑： Boost 还有一个自己的替代品。

Edit2：看起来像概念已从C ++ 0x删除。

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

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