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chaiscript - 将类的非静态成员函数暴露给 chaiscript

问题描述

我有一个项目试图用 chaiscript 实现键盘宏脚本。我正在编写一个基于 xlib 的类来包装 xlib 代码。由于 xlib 怪癖，我有一个成员函数可以将修饰键添加到忽略的列表中。我怎么能做类似以下最小示例的事情。

#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;
}

我尝试绑定并失败，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;
                                                                                       ^~~~~~~~~~~

我还尝试使变量 static 起作用，但是如果我尝试使在每个热键的基础上忽略修饰符成为可能，它将不起作用。

我究竟做错了什么？我该如何解决？

标签： chaiscript

解决方案

你可以这样做：

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

或使用 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

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

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