LuaScriptEngine_impl.tcc

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#pragma once
 
#include <string>
 
#include "BAREErrors.hpp"
 
namespace BARE2D {
    
    template<class T>
    void LuaScriptEngine::addValueToRegistry(lua_State* L, T* value, std::string key) {
        // Push the key
        lua_pushstring(L, key.c_str());
        // Push the data (as a void*)
        lua_pushlightuserdata(L, static_cast<void*>(value));
        // Combine name and key in the registry.
        lua_settable(L, LUA_REGISTRYINDEX);
    }
    
    template<class T>
    T* LuaScriptEngine::getValueFromRegistry(lua_State* L, std::string key) {
        // Put the key on the stack
        lua_pushstring(L, key.c_str());
        // Get the element at key in tge registry table
        lua_gettable(L, LUA_REGISTRYINDEX);
        // Turn the element into a void*
        void* ret = lua_touserdata(L, -1);
        lua_pop(L, 1);
        // convert to whatever type
        return static_cast<T*>(ret);
    }
    
}