从结构调用C ++成员函数指针

问题描述

我已经找到关于调用C ++成员函数指针和在结构体中调用指针的信息，但是我需要调用存在于结构体​​中的成员函数指针，并且我还没有得到正确的语法。我在类MyClass的方法中有以下代码片段：

I have found information on calling C++ member function pointers and calling pointers in structs, but I need to call a member function pointer that exists inside of a structure, and I have not been able to get the syntax correct. I have the following snippet inside a method in class MyClass:

void MyClass::run() {
    struct {
        int (MyClass::*command)(int a, int b);
        int id;
    } functionMap[] = {
        {&MyClass::commandRead,  1},
        {&MyClass::commandWrite, 2},
    };

    (functionMap[0].MyClass::*command)(x, y);
}

int MyClass::commandRead(int a, int b) {
    ...
}

int MyClass::commandWrite(int a, int b) {
    ...
}

这给我：

error: expected unqualified-id before '*' token
error: 'command' was not declared in this scope
(referring to the line '(functionMap[0].MyClass::*command)(x, y);')

移动这些括号会导致语法错误，推荐使用。*或 - > *，在这种情况下都不起作用。是否有人知道正确的语法？

Moving those parenthesis around results in syntax errors recommending using .* or ->* neither of which work in this situation. Does anyone know the proper syntax?

推荐答案

使用：

(this->*functionMap[0].command)(x, y);

测试并编译;）

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