Re: attempt to concatenate field 'value' (a function value)

Hello,

Your Lua code should not be working at all, since no libraries are 
loaded and print isn't even defined.
After adding luaL_openlibs(L); after creating the Lua state, it works 
fine for me:

$ ./lua
value : 4

Regards,
Andreas


Am 01.11.2014 um 18:45 schrieb [email protected]:
> Can anybody explain this for me? It used to work on an older system with
> lua5.1.
>
> i'm now using lua5.2, luabind version us 0.9.1 (on both systems)
>
> g++ -o lua lua.cpp -lluabind -llua5.2 -ldl -I /usr/include/lua5.2
> ./lua
> lua runtime error
> [string "function test(t)..."]:2: attempt to concatenate field 'value' (a
> function value)
>
> extern "C" {
> #include "lua.h"
> #include "lualib.h"
> #include "lauxlib.h"
> }
>
> #include <luabind/luabind.hpp>
> #include <iostream>
>
> struct Test
> {
>    Test(int v) : value(v) {};
>    ~Test() {};
>    int value;
> };
>
>
> int DebuggerFunc(lua_State* L)
> {
> 	luabind::object error_msg(luabind::from_stack(L, -1));
> 	std::cerr << error_msg << std::endl;
> 	return 0;
> }
>
> int main() {
>    lua_State *L = luaL_newstate();
>    luabind::open(L);
>
>    luabind::module(L)
>    [
>      luabind::class_<Test>("Test")
>      .def(luabind::constructor<int>())
>      .def_readonly("value",&Test::value)
>    ];
>
>    luaL_dostring(
>      L,
>      "function test(t)\n"
>      "  print(\"value : \" .. t.value)\n"
>      "end\n"
>    );
>
>    Test t(4);
>
>    try {
>      luabind::call_function<int>(L, "test", &t);
>    }
>    catch (const luabind::error &er)
>    {
>      std::cerr << er.what() << std::endl;
>      lua_State* Ler=er.state();
>      DebuggerFunc(Ler);
>    }
>    catch (...)
>    {
>      std::cerr << "Unknown error!" << std::endl;
>    }
>    lua_close(L);
> }
>
>
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