lua_settable

int func_return_table(lua_State *L)
{
 lua_newtable(L);//创建一个表格，放在栈顶
 lua_pushstring(L, "mydata");//压入key
 lua_pushnumber(L,66);//压入value
 lua_settable(L,-3);//弹出key,value，并设置到table里面去

 lua_pushstring(L, "subdata");//压入key
 lua_newtable(L);//压入value,也是一个table
 lua_pushstring(L, "mydata");//压入subtable的key
 lua_pushnumber(L,53);//value
 lua_settable(L,-3);//弹出key,value,并设置到subtable

 lua_settable(L,-3);//这时候父table的位置还是-3,弹出key,value(subtable),并设置到table里去
 lua_pushstring(L, "mydata2");//同上
 lua_pushnumber(L,77);
 lua_settable(L,-3);
 return 1;//堆栈里现在就一个table.其他都被弹掉了。
}


返回的表结构是:

{
 "mydata" = 66,
 "mydate2" = 77,
 "subdata" = 
 {
  "mydata" = 53
 }
}

[-2, +0, e]

void lua_settable (lua_State *L, int index);

Does the equivalent to t[k] = v, where t is the value at the given index, v is the value at the top of the stack, and k is the value just below the top.

This function pops both the key and the value from the stack. As in Lua, this function may trigger a metamethod for the "newindex" event