将类的非静态成员函数暴露给chaiscript

Question

我有一个项目，试图实现键盘宏脚本与chaiscript。我正在编写一个基于xlib的类来包装xlib代码。由于xlib的怪癖，我有一个成员函数将修改键添加到一个被忽略的列表中。我怎么能做下面这个最小的例子呢？

#include <chaiscript/chaiscript.hpp>
#include <functional>

class MacroEngine{
public:
    MacroEngine() = default;
    //...
    void addIgnoredMod(int modifier){
        ignoredMods |= modifier;
    }
    //...
private:
    int ignoredMods;
};

int main(int argc, char *argv[]){
    MacroEngine me;
    chaiscript::ChaiScript chai;
    //...
    chai.add(chaiscript::fun(std::bind(&MacroEngine::addIgnoredMod, me, std::placeholders::_1)), "setIgnoredMods");
    //...
    return 0;
}

我尝试绑定，但失败了，并显示以下错误消息：

In file included from ../deps/ChaiScript/include/chaiscript/dispatchkit/proxy_functions_detail.hpp:24:0,
                 from ../deps/ChaiScript/include/chaiscript/dispatchkit/proxy_functions.hpp:27,
                 from ../deps/ChaiScript/include/chaiscript/dispatchkit/proxy_constructors.hpp:14,
                 from ../deps/ChaiScript/include/chaiscript/dispatchkit/dispatchkit.hpp:34,
                 from ../deps/ChaiScript/include/chaiscript/chaiscript_basic.hpp:12,
                 from ../deps/ChaiScript/include/chaiscript/chaiscript.hpp:823,
                 from ../src/main.cpp:2:
../deps/ChaiScript/include/chaiscript/dispatchkit/callable_traits.hpp: In instantiation of ‘struct chaiscript::dispatch::detail::Callable_Traits<std::_Bind<void (MacroEngine::*(MacroEngine, std::_Placeholder<1>))(unsigned int)> >’:
../deps/ChaiScript/include/chaiscript/language/../dispatchkit/register_function.hpp:45:72:   required from ‘chaiscript::Proxy_Function chaiscript::fun(const T&) [with T = std::_Bind<void (MacroEngine::*(MacroEngine, std::_Placeholder<1>))(unsigned int)>; chaiscript::Proxy_Function = std::shared_ptr<chaiscript::dispatch::Proxy_Function_Base>]’
../src/main.cpp:21:95:   required from here
../deps/ChaiScript/include/chaiscript/dispatchkit/callable_traits.hpp:99:84: error: decltype cannot resolve address of overloaded function
           typedef typename Function_Signature<decltype(&T::operator())>::Signature Signature;
                                                                                    ^~~~~~~~~
../deps/ChaiScript/include/chaiscript/dispatchkit/callable_traits.hpp:100:86: error: decltype cannot resolve address of overloaded function
           typedef typename Function_Signature<decltype(&T::operator())>::Return_Type  Return_Type;
                                                                                       ^~~~~~~~~~~

我还试图让变量static起作用，但如果我试图让它可以忽略每个热键上的修饰符，它就不会起作用。

我做错了什么？我怎么才能修复它呢？

Answer 1

您可以这样做：

chai.add(chaiscript::fun(&MacroEngine::addIgnoredMod, &me), "addIgnoredMod");

或者使用lambda：

chai.add(chaiscript::fun([&me](int modifier){ me.addIgnoredMod(modifier); }), "addIgnoredMod");

Chaiscript的创建者Jason Turner在这里发表了评论：http://discourse.chaiscript.com/t/may-i-use-std-bind/244/4

“使用std::bind真的没有任何好的理由。我更好的解决方案是使用lambda (更好，我的意思是更好。std::bind增加了编译大小、编译时间和运行时)。”