指向类成员的模板参数 [英] Pointer to class member as template parameter
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问题描述
有可能有非类型模板参数,实际上是一个类成员的指针?我想要做的是类似下面的:
Is it possible to have non-type template parameter which is actually a pointer to a class member? What I'm looking to do is something like the following:
struct Person {
Dog dog;
};
template <?? ptr>
struct Strange {
// ...
};
typedef Strange<&Person::dog> weird;
到目前为止,我的工作使我相信没有什么是可能的,
My work so far leads me to believe that nothing of the sort is possible, but I'm curious if anyone has can say otherwise.
推荐答案
非类型模板参数必须具有以下类型之一(可选cv-qualaled):
A non-type template-parameter shall have one of the following (optionally cv-qualified) types:
- 整数或枚举类型,
- 指向对象或函数指针的指针,
- 引用对象或函数引用,
- 指向会员的指针。
- integral or enumeration type,
- pointer to object or pointer to function,
- reference to object or reference to function,
- pointer to member.
允许,似乎工作在 g ++
像这样:
So it is allowed, and seems to work on g++
like this:
template <Dog Person::*ptr>
struct Strange { ... };
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