D Lua doesn't get metatable

Question

I'm trying to get Lua to work with the new programming language D. Everything works fine (library, lua52.dll, etc.) but luaL_getmetatable crashes. Originally, the function was not defined in dlua, but I added it:

    //C     #define luaL_getmetatable(L,n)  (lua_getfield(L, LUA_REGISTRYINDEX, (n)))
    void luaL_getmetatable(lua_State* L, const(char)* s) {
        lua_getfield(L, LUA_REGISTRYINDEX, s);
    }

But when I run:

    L = lua_open();
    luaL_openlibs(L);
    // prevent script kiddies
    luaL_dostring(L, "os = nil; io = nil");
    // reprogram 'print'
    luaL_newmetatable(L, "vector");
    luaL_getmetatable(L, "vector"); // CRASH

it crashes. Any ideas why this is?

Also, more info pls, how does it crash, which compiler did you use, give a complete test program etc. — Trass3r
– Trass3r, Commented Apr 25, 2012 at 21:45

jA_cOp · Accepted Answer · 2012-04-25 23:20:04Z

8

It sounds like you are using the ancient dlua bindings, not LuaD, which has always had luaL_getmetatable.

However, both these bindings as well as your code are for Lua 5.1, not 5.2; make sure you link to the correct version of Lua. There is no lua_open in Lua 5.2 (and it's deprecated in 5.1).

If you encounter the same problem after linking to the right library, I recommend compiling Lua with the macro LUA_USE_APICHECK set and trying again to see exactly what went wrong.

answered Apr 25, 2012 at 23:20

jA_cOp

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1 Comment

user10F64D4 Over a year ago

Thanks! I was indeed using a wrong version, but only of the dlua head file. I changed them according to their C header equivalents and now everything works!

dav1d · Accepted Answer · 2012-04-25 13:30:27Z

1

Maybe you should take a look at the existing Lua-Bindings for D, LuaD.

answered Apr 25, 2012 at 13:30

dav1d

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2 Comments

user10F64D4 Over a year ago

That's not quite the solution I was looking for. My existing code in C++ is written without LuaD.

Trass3r Over a year ago

N.B.: LuaD is a lot easier to use cause it's not a simple binding but a very clever wrapper that leverages D's capabilities.

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