Why doesnt lua_newlib work in this example?
c, lua
Solution
luaL_newlib creates a new table and populates it from a list of functions. Your function mysin is inside this table and is not a global function. If you want it to be a global function, use lua_register.
Problem
I tried to call from a lua script the c method my_sin. I'm using lua 5.2.2 and wanted to test to use luaL_newlib instead of lua_register. Unfortunately, the lua script doesn't find mysin. ``` extern "C" { #include "lua.h" #include "lauxlib.h" #include "lualib.h" } #include <cmath> static int my_sin (lua_State *L) { lua_pushnumber(L, sin(luaL_checknumber(L, 1))); return 1; } static const luaL_Reg my_lib[] = { {"mysin", my_sin}, {NULL, NULL} }; int my_open(lua_State *L) { luaL_newlib(L, my_lib); return 1; } int main() { lua_State* L = luaL_newstate(); luaL_openlibs(L); my_open(L); luaL_dostring(L, "print(mysin(2))"); lua_close(L); return 0; } ```