问题描述
使用C++、lua 5.1、luabind 0.7-0.81
尝试创建一个带有父类的 lua 类并将其存储在 luabind::object 中.
Lua
class 'TestClassParent'函数 TestClassParent:__init()打印('父初始化
')结尾函数 TestClassParent:__finalize()打印('父完成
')结尾类TestClass"(TestClassParent)函数测试类:__init()打印('初始化
')TestClassParent.__init(self)结尾函数 TestClass:__finalize()打印('完成
')结尾C++
{luabind::object obj = luabind::call_function(lua_state, "TestClass");}printf("GC前
");lua_gc(lua, LUA_GCCOLLECT, 0);printf("GC后
");输出:
初始化
父初始化
GC前
GC后
结果: obj 被销毁后，'TestClass' 实例在垃圾回收周期后仍然活着(__finalize 方法未被调用，内存未被释放).它仅在程序退出时销毁.
Moresome 如果我在没有父级的情况下使用类，则会正确收集垃圾.
如果我尝试使用采用策略(获取创建对象的所有权)
luabind::object obj = luabind::call_function(lua_state, "TestClass")[luabind::adopt(luabind::result)];我明白了:
- 在 luabind 0.7 中 - 与不采用策略的结果相同
- 在 luabind 0.81 中 - 崩溃并显示消息您正在尝试使用未注册类型"
我怎样才能正确在 C++ 中创建一个 lua 对象并取得它的所有权?
这是 0.8.1 中的已知错误；对最后构造对象的引用保留在超级"函数 upvalue 中.它已在 0.9-rc1 中修复:
http://github.com/luabind/luabind/commit/2c99f0475afea7c282c2e432499fd22aa17744e3" rel="noreferrer">http://github.com/luabind/luabind/commit/2c99f0475c283c27fc9fd275243c77fd27524ac70/p> Using C++, lua 5.1, luabind 0.7-0.81 Trying to create a lua class with parent and store it in a luabind::object. Lua C++ Output: Result: After obj is destroyed, 'TestClass' instance is still alive after garbage collection cycle (__finalize method is not called and memory is not freed). It's destroying only on program exit. If I try to use adopt policy (to take ownership of created object) I get: How can I correctly create a lua object in C++ and take it's ownership? This is a known bug in 0.8.1; a reference to the last constructed object is left in the "super" function upvalue. It has been fixed in 0.9-rc1: http://github.com/luabind/luabind/commit/2c99f0475afea7c282c2e432499fd22aa17744e3 这篇关于在 luabind::object 中存储带有父级的 lua 类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！class 'TestClassParent'
function TestClassParent:__init()
print('parent init
')
end
function TestClassParent:__finalize()
print('parent finalize
')
end
class 'TestClass' (TestClassParent)
function TestClass:__init()
print('init
')
TestClassParent.__init(self)
end
function TestClass:__finalize()
print('finalize
')
end
{
luabind::object obj = luabind::call_function<luabind::object>(lua_state, "TestClass");
}
printf("before GC
");
lua_gc(lua, LUA_GCCOLLECT, 0);
printf("after GC
");
init
parent init
before GC
after GC
Moresome if I use class without parent, garbage is collected correctly.luabind::object obj = luabind::call_function<luabind::object>(lua_state, "TestClass")[luabind::adopt(luabind::result)];