成员函数调用decltype [英] Member function call in decltype

问题描述

以下代码：

struct A
{
    int f(int);
    auto g(int x) -> decltype(f(x));
};

无法编译时出现错误：

error: cannot call member function 'int B::f(int)' without object

如果我将其更改为：

struct A
{
    int f(int);
    auto g(int x) -> decltype(this->f(x));
};

我得到另一个错误：

error: invalid use of 'this' at top level

错了这两个？我使用的是gcc 4.6

What is wrong with either of these? I am using gcc 4.6

推荐答案

目前您只能访问this >函数体，但这很可能会很快改变：

Currently you can only access 'this' and members of the class inside the function body, but this is likely to be changed soon:

http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1207

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