lua table操作实例详解

lua table操作实例详解

lua_gettable
lua_getglobal(L, "mytable") <== push mytable
lua_pushnumber(L, 1)        <== push key 1
lua_gettable(L, -2)         <== pop key 1, push mytable[1]

lua_settable
lua_getglobal(L, "mytable") <== push mytable
lua_pushnumber(L, 1)        <== push key 1
lua_pushstring(L, "abc")    <== push value "abc"
lua_settable(L, -3)         <== mytable[1] = "abc", pop key & value

lua_rawget:
用法同lua_gettable,但更快(因为当key不存在时不用访问元方法__index)

lua_rawset:
用法同lua_settable,但更快(因为当key不存在时不用访问元方法__newindex)

lua_rawgeti必须为数值键
lua_getglobal(L, "mytable") <== push mytable
lua_rawgeti(L, -1, 1)       <== push mytable[1]，作用同下面两行调用
--lua_pushnumber(L, 1)      <== push key 1
--lua_rawget(L,-2)          <== pop key 1, push mytable[1]

lua_rawseti必须为数值键
lua_getglobal(L, "mytable") <== push mytable
lua_pushstring(L, "abc")    <== push value "abc"
lua_rawseti(L, -2, 1)       <== mytable[1] = "abc", pop value "abc"

lua_getfield必须为字符串键
lua_getglobal(L, "mytable") <== push mytable
lua_getfield(L, -1, "x")    <== push mytable["x"]，作用同下面两行调用
--lua_pushstring(L, "x")    <== push key "x"
--lua_gettable(L,-2)        <== pop key "x", push mytable["x"]

lua_setfield必须为字符串键
lua_getglobal(L, "mytable") <== push mytable
lua_pushstring(L, "abc")    <== push value "abc"
lua_setfield(L, -2, "x")    <== mytable["x"] = "abc", pop value "abc"