src/libjin-lua/common/je_lua_reference.cpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

#include "common/je_lua.h"

#include "je_lua_reference.h"

namespace JinEngine
{
    namespace Lua
    {

        LuaRef::LuaRef(lua_State* L, int i)
            : mL(L)
        {
            // Get value.
            luax_pushvalue(mL, i);
            // Set reference.
            luax_getreferencestable(L);
            luax_pushvalue(mL, -2);
            mIndex = luax_ref(mL, -2);
            luax_pop(L, 3);
        }

        LuaRef::~LuaRef()
        {
            unref();
        }

        void LuaRef::unref()
        {
            luax_getreferencestable(mL);
            luax_unref(mL, -1, mIndex);
            luax_pop(mL, 1);
        }

        void LuaRef::push()
        {
            luax_getreferencestable(mL);
            luax_rawgeti(mL, -1, mIndex);
            luax_remove(mL, -2);
        }

    }
}