成员函数traits [英] Member function traits

问题描述

我编写一个模板类来封装成员函数以减少一些调用 - 如果一些条件为真，则不需要调用成员函数。签名将类似这样

I am writing a template class that wraps around member functions to reduce some calls - if some condition is true, the member function doesn't need to be called. The signature would look something like this

template <typename MemFuncType, MemFuncType> class MemberWrapper;

我可以专门研究：

template <typename R, typename T, R T::* MemFunc> class MemberWrapper<R T::*, MemFunc>{};

我也想限制 RT :: * 。

我可以想到的唯一解决方案是通过提供基于返回类型，函数类型，参数列表的部分特化来实现成员函数traits类和cv限定符。这将导致一个繁琐的实现，如当前 std :: mem_fn overloads 。是否有更好的方法？

The only solution I can think of is to implement a member functions traits class by providing partial specializations based on return type, function type, arguments list and cv-qualifiers. This would lead to a cumbersome implementation like the current std::mem_fn overloads. Is there a way of doing it better?

编辑：更改 Ret 到 / code>。

EDIT : Changed Ret to R. As pointed out in the comments, it isn't really the return type and the specialization was invalid.

推荐答案

Boost函数类型提供了一个伟大的函数traits集合。此外，此 SO post 显示示例。

Boost Function Types provides a great collection of function traits. Also, this SO post shows examples.

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