使用C ++自动进行Lua绑定 [英] Automated Lua Binding using C++

问题描述

我正在构建一个简单的2D游戏引擎，并且它变得越来越大，因此无法公开Lua中的所有功能:因此，我正在尝试使该过程自动化一些， 无论如何，是否有一次从堆栈中获取所有n个参数(具有不同类型)并将它们直接注入C ++函数中. 我已经自动执行了args检查功能.功能绑定仍然有些棘手

I'm building a simple 2D game engine, and its getting bigger and bigger, exposing all of the function in Lua will be impossible: so I'm trying to automate a little bit the process, Is there anyway to get all the n arguments (with different types) from the stack at once and inject them directly into the C++ function. I already automated functions args checking. still the function binding which is a little bit tricky

例如: 我有更改子画面位置的普通代码:

For E.g: I have normal code for changing sprite position:

int LuaSprite::SetSpritePosition(lua_State* L)
{
    Drawable* sprt = (Drawable*)lua_touserdata(L, 1);
    int x = (int)lua_tonumber(L, 2);
    int y = (int)lua_tonumber(L, 3);
    sprt->setPosition(Vec2i(x, y));
    return 0;
}

我想要实现的概念更像这样:

The concept that i want achieve is more less like this:

int LuaSprite::SetSpritePosition(lua_State* L)
{   
    LOAD_ARGS(Sprite*, int, int)
    GET_ARG(1)->setPosition(Vec2i(GET_ARGS_FROM(1)));
    LOAD_RETURN(true, x, y, 3);
    return 3;
}

所以

• LOAD_ARGS将分别从堆栈中获得给定类型.
  
• GET_ARG(i)将在索引i处获得arg.
  
• GET_ARGS_FROM(i)将执行类似x，y，z，type
  

我并没有要求不可能做到的相同行为，但是至少有类似的事情
而且我敢肯定，仅使用普通" C ++不能实现这一点，并且我还需要一些魔术"宏.
我没有使用现成的自动Lua绑定库"，因为有自定义结构，并且某些函数正在使用复杂的结构和类 我做了很多搜索，感到很迷茫.

I'm not requesting same behavior as it could be impossible to do, but something similar at least
And I'm sure that this isn't achievable only using 'plain' C++ and that I need also some 'magic' macros.
I'm not using the ready auto Lua binding "libraries" because there is custom structs and some functions are using complex structures and classes I have done a lot of searching and I feel really lost.

推荐答案

尝试Luaaa( https://github. com/gengyong/luaaa )，它更轻巧，仅在一个头文件中实现.

try Luaaa(https://github.com/gengyong/luaaa), that's more lightweight, implement in only one single header file.

它完全满足您的要求.

It satisfied your requirements perfectly.

示例代码:

    // include luaaa file
    #include "luaaa.hpp"
    using namespace luaaa;  

    // Your exists class
    class Cat
    {
    public:
        Cat();
        virtual ~Cat();
    public:
        void setName(const std::string&);
        const std::string& getName() const;
        void eat(const std::list<std::string>& foods);
        //...
    private:
        //...
    };

    lua_State * state; // create and init lua

    // To export it:
    LuaClass<Cat>(state, "AwesomeCat")
    .ctor<std::string>();
    .fun("setName", &Cat::setName);
    .fun("getName", &Cat::getName);
    .fun("eat", &Cat::eat);
    .def("tag", "Cat");

---

您可以在此处找到更多详细信息( https://github.com/gengyong/luaaa )

我是该库的作者，强烈建议您尝试一下.如果有任何疑问，请随时提问.

I'm the author of this lib, I strongly recommend you have a try for it, if you have any questions, please feel free to ask.

这篇关于使用C ++自动进行Lua绑定的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！