增量定义? [英] incremented define?

问题描述

无论如何都要在每次使用时定义增量?

Is there anyways to have a define increment every time you use it?

例如

int a = ADEFINE;
int b = ADEFINE;

a 是 1，b 是 2.

a is 1 and b is 2.

推荐答案

如果你不需要编译时常量，你可以这样做来枚举类:

If you don't need compile-time-constants, you could do something like this to enumerate classes:

int counter() {
    static int i = 0;
    return i++;
}

template<class T>
int id() { 
    static int i = counter();
    return i; 
};

class A {};
class B {};

int main()
{
    std::cout << id<A>() << std::endl;
    std::cout << id<B>() << std::endl;
}

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