尽管字符串和数字可以自动转换,但两者是不同的,像10 == "10"这样的比较永远都是错的。如果需要显式将string转成数字可以使用函数tonumber(),如果string不是正确的数字该函数将返回nil。 line = io.read() -- read a line n = tonumber(line) -- try to convert it to a number if n == nil then ...
nil, boolean, number, string, userdata, function, thread, and table. type()可以获取一个变量的类型, print(type("Hello world")) --> string print(type(10.4*3)) --> number print(type(print)) --> function print(type(type)) --> function print(type(true)) --> boolean print(type(nil)...
这就是为什么我们可以将n传递给上面的ffi.string()。但是其他 Lua 库函数或模块不知道如何处理这个问题。因此,为了获得最大的可移植性,需要在传递它们之前对返回的长结果使用tonumber() 。否则,应用程序可能在某些系统上运行,但在 POSIX/x64 环境中会失败。 为C 类型定义元方法 以下代码解释了如何为 C 类型定义...
}lua_pop(lua,1);/* Consume the Lua error */}else{// 将 Lua 函数执行所得的结果转换成 Redis 回复,然后传给调用者客户端luaReplyToRedisReply(c, run_ctx->c, lua);/* Convert and consume the reply. */}/* Perform some cleanup that we need to do both on error and success. */if(del...
Lua number -> Redis integer reply (the number is converted into an integer) / Lua 数字转换成 Redis 整数 Lua string -> Redis bulk reply / Lua 字符串转换成 Redis bulk 回复 Lua table (array) -> Redis multi bulk reply (truncated to the first nil inside the Lua array if any) / Lua 表...
There is no simple way to have nils inside Lua arrays, this is a result of Lua table semantics, so when Redis converts a Lua array into Redis protocol the conversion is stopped if a nil is encountered.Lua是动态类型语言，所以变量没有类型，仅值有类型。值可以被存储在变量中，作为...
Each thread must not be allowed to access Globals from other threads Metatables for Number, String, Thread, Function, Boolean, and and Nil are shared and therefore should not be mutated once lua code is running in any thread. For an example of loading allocating per-thread Globals and invok...
There are eight basic types in Lua: nil, boolean, number,string, function, userdata, thread, and table. The type nil has one single value, nil, whose main property is to be different from any other value; it often represents the absence of a useful value. The type boolean has two valu...
aTable = {} for i = 1, 10 do aTable[i] = i end io.write("First : ", aTable[1]) io.write("Number of Items: ", #aTable, "\n") table.insert(aTable, 1, 0) io.write("First : ", aTable[1]) -- remove table.remove(aTable, 1) -- convert to string print(table.conca...
*/lctx.lua_scripts=dictCreate(&shaScriptObjectDictType);lctx.lua_scripts_mem=0;/* 注册 redis 的一些 api 到 lua 环境中 */luaRegisterRedisAPI(lua);/* 注册调试命令 */lua_getglobal(lua,"redis");/* redis.breakpoint */lua_pushstring(lua,"breakpoint");lua_pushcfunction(lua,luaRedisBreak...