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luaL_optnumber

luaL_optnumber[-0, +0, v]

lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number d);

If the function argument arg is a number, returns this number. If this argument is absent or is nil, returns d. Otherwise, raises an error.

Links:

https://www.lua.org/manual/5.3/manual.html#luaL_optnumber

doc_lua

2017-02-21 04:12:29

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