Cpgf如何实现lua script binding的？.
Lib：
https://github.com/cpgf/cpgf/tree/master
代码
以下是operator的实现函数
int UserData_operator(lua_State * L) { ENTER_LUA() GOperatorGlueDataPointer glueData = static_cast<GGlueDataWrapper *>(lua_touserdata(L, lua_upvalueindex(1)))->getAs<GOperatorGlueData>(); return invokeOperator(glueData->getBindingContext(), glueData->getObjectData(), glueData->getMetaClass(), glueData->getOp()); LEAVE_LUA(L, return 0) }
可见cpgf 设置 一个GGlueDataWrapper *指针作为upvalue，从而可以方便的调用相关实现
而注册函数如下
由于对lua api不很熟悉，这段代码还没有完全搞懂
有时间仔细研究下
void helperBindOperator(const GContextPointer & context, const GObjectGlueDataPointer & objectData, IMetaClass * metaClass, GMetaOpType op)
{
lua_State * L = getLuaState(context);
for(size_t i = 0; i < sizeof(metaOpTypes) / sizeof(metaOpTypes[0]); ++i) {
if(metaOpTypes[i] == op) {
GOperatorGlueDataPointer operatorData(context->newOperatorGlueData(objectData, metaClass, op));
GLuaRefUserData * glueUserData = operatorData->getUserDataAs<GLuaRefUserData>();
if(glueUserData != nullptr) {
glueUserData->get();
if(! lua_isnil(L, -1)) {
return;
}
lua_pop(L, 1);
}
lua_pushstring(L, luaOperators[i]);
void * userData = lua_newuserdata(L, getGlueDataWrapperSize<GOperatorGlueData>());
newGlueDataWrapper(userData, operatorData);
lua_newtable(L);
setMetaTableSignature(L);
setMetaTableGC(L);
lua_setmetatable(L, -2);
lua_pushcclosure(L, &UserData_operator, 1);
lua_rawset(L, -3);
glueUserData = new GLuaRefUserData(L, false);
operatorData->setUserData(glueUserData);
glueUserData->retainAndPop();
glueUserData->get();
return;
}
}
}