Lua 学习 chapter27

lua堆栈操作

针对于lua堆栈的操作。

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static void stackDump(lua_State* L) {
	int i;
	int top = lua_gettop(L);
	for (int i = 0; i <= top; i++)
	{
		int t = lua_type(L, i);
		switch (t)
		{
		case LUA_TSTRING: {
			printf("%s", lua_tostring(L, i));
			break;
		}
		case LUA_TBOOLEAN: {
			printf(lua_toboolean(L, i) ? "true" : "false");
			break;
		}
		case LUA_TNUMBER: {
			printf("%g", lua_tonumber(L, i));
			break;
		}
		default:
			printf("%s", lua_typename(L, t));
			break;
		}
		printf(" ");
	}
	printf("n");
}
static void test() {

lua_State* L = luaL_newstate();
<span class="n">lua_pushboolean</span><span class="p">(</span><span class="n">L</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span>
<span class="n">lua_pushnumber</span><span class="p">(</span><span class="n">L</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
<span class="n">lua_pushnil</span><span class="p">(</span><span class="n">L</span><span class="p">);</span>
<span class="n">lua_pushstring</span><span class="p">(</span><span class="n">L</span><span class="p">,</span> <span class="s">&#34;hello&#34;</span><span class="p">);</span>
<span class="n">stackDump</span><span class="p">(</span><span class="n">L</span><span class="p">);</span><span class="c1">//true 10 nil hello

	lua_pushvalue(L, -4);//将指定索引的值压到栈顶

	stackDump(L); //true 10 nil hello true

	lua_replace(L, 3);//pop栈顶元素，并将pop的值设置到指定索引

	stackDump(L);// true 10 true hello

	lua_settop(L, 6);//设置栈中元素个数,0的话清空栈，大于原来个数补nil

	stackDump(L);//true 10 true hello nil nil

	lua_rotate(L, 3, 1);//旋转指定位置的值，并把栈顶元素补充过来

	stackDump(L);//true 10 nil true hello nil

	lua_remove(L, -3);//移除指定位置的值

	stackDump(L);//true 10 nil hello nil

	lua_close(L);

}

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Lua 学习 chapter27

目录

lua堆栈操作