Function MakeFieldMetatable

library/LuaTypes.cpp:1579–1604

* Make a struct-style object metatable. */

 * Make a struct-style object metatable.
 */
static void MakeFieldMetatable(lua_State *state, const struct_identity *pstruct,
                               lua_CFunction reader, lua_CFunction writer,
                               lua_CFunction iterator, bool globals = false)
{
    int base = lua_gettop(state);

    MakeMetatable(state, pstruct, "struct"); // meta, fields

    // Index the fields
    lua_newtable(state);
    IndexFields(state, base, pstruct, globals ? IndexFieldsFlags::GLOBALS : 0);

    // Add the iteration metamethods
    PushStructMethod(state, base+1, base+3, iterator);
    SetPairsMethod(state, base+1, "__pairs");
    lua_pushnil(state);
    SetPairsMethod(state, base+1, "__ipairs");

    lua_setfield(state, base+1, "_index_table");

    // Add the indexing metamethods
    SetStructMethod(state, base+1, base+2, reader, "__index");
    SetStructMethod(state, base+1, base+2, writer, "__newindex");

    // returns: [metatable readfields writefields];
}

/**
 * Make a primitive-style metatable