Method IsUserData

lua.go:703–706

IsUserData verifies that the value at index is a userdata. http://www.lua.org/manual/5.2/manual.html#lua_isuserdata

(index int)

//
// http://www.lua.org/manual/5.2/manual.html#lua_isuserdata
func (l *State) IsUserData(index int) bool {
	_, ok := l.indexToValue(index).(*userData)
	return ok
}

// Arith performs an arithmetic operation over the two values (or one, in
// case of negation) at the top of the stack, with the value at the top being