如何检查缓冲区是否为空？

Question

如何检查缓冲区是否为空？我认为，检查count-lines是否为0会导致过度查杀。

更新： 是的，phils的答案应该工作。写出来：

(defun buffer-empty-p (&optional buffer) 
    (= (buffer-size buffer) 0)) 

Answer 1

buffer-size is a built-in function in `C source code'. 

(buffer-size &optional BUFFER) 

Return the number of characters in the current buffer. 
If BUFFER, return the number of characters in that buffer instead.