C++如何实现回调？

Question

我正在尝试用 C++ 实现 Button class。到目前为止的进展情况如下：

button.h:

class Button {
    private:
        unsigned short x;
        unsigned short y;
        std::string text;
        std::function<void()> onClickFunction;
    
    public:
        Button(unsigned short x, unsigned short y, std::string text, std::function<void()> onClickFunction);
        void onClick();

button.cpp:

Button::Button(unsigned short x, unsigned short y, std::string text, std::function<void()> onClickFunction)
{
    this->x = x;
    this->y = y
    this->text = text;
    this->onClickFunction = onClickFunction;
}

void Button::onClick()
{
    this->onClickFunction();
}

但是，当我尝试创建一个按钮时，例如：

this->toggleGridButton = Button(x, y, "Toggle Grid", &Engine::toggleGrid);

我收到以下错误：

no instance of constructor "Button::Button" matches the argument list -- argument types are: (int, int, const char [12], void (Engine::*)())

如何回调成员函数？

Answer 1

你可能想要：

this->toggleGridButton = Button(x, y, "Toggle Grid", [this]() { this->toggleGrid(););

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