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Which is the function to make the current buffer?
The most basic function for designating a current buffer is set-buffer . This function returns the current buffer. This function makes buffer-or-name the current buffer. buffer-or-name must be an existing buffer or the name of an existing buffer. The return value is the buffer made current.
How to save the identity of the current buffer?
Macro: with-current-buffer buffer-or-name body… The with-current-buffer macro saves the identity of the current buffer, makes buffer-or-name current, evaluates the body forms, and finally restores the current buffer. buffer-or-name must specify an existing buffer or the name of an existing buffer.
How does the current buffer in Lisp work?
Normally, the buffer displayed in the selected window is the current buffer, but this is not always so: a Lisp program can temporarily designate any buffer as current in order to operate on its contents, without changing what is displayed on the screen. The most basic function for designating a current buffer is set-buffer .
How does the with temp buffer macro work?
The with-temp-buffer macro evaluates the body forms with a temporary buffer as the current buffer. It saves the identity of the current buffer, creates a temporary buffer and makes it current, evaluates the body forms, and finally restores the previous current buffer while killing the temporary buffer.
What is the return value of save current buffer?
The save-current-buffer special form saves the identity of the current buffer, evaluates the body forms, and finally restores that buffer as current. The return value is the value of the last form in body. The current buffer is restored even in case of an abnormal exit via throw or error (see Nonlocal Exits ).
What does the current buffer do in Emacs?
There are, in general, many buffers in an Emacs session. At any time, one of them is designated the current buffer—the buffer in which most editing takes place. Most of the primitives for examining or changing text operate implicitly on the current buffer (see Text).
How to create a buffer around a point?
The one-mile buffer around the point crosses 30% of a polygon with a population of 100, and 40% of a second polygon with a population of 10; therefore, the total population within the 1 mile buffer is 34: (30%(100))+(40%(10))= 34 Note: This procedure assumes that attribute data is spread evenly across a polygon feature.
Where does the overwrite go in a buffer?
A buffer where the data will wrap. When the data being added reaches the limit of the buffer size, the overwrite will be placed back at the start of the buffer, and further writing will continue from that point. This is a special “stripped down” buffer that is extremely fast to read/write to.
How to calculate the offset of a buffer?
So, if your byte alignment is set to, say, 4 bytes and you write a single piece of data which is 1 byte in size then do a buffer tell (a tell gets the current position for reading/writing for the buffer), you’ll get an offset of 1 (the offset in this case is the number of bytes from the start of the buffer to the current read/write position).
How to remove all active buffers in Vim?
With this set, vim will prompt you to save file changes on close. :bufdo is a useful command that performs another command on all active buffers. Combining the :bufdo command with the :bw/:bd command lets you remove all active buffers at once.
How is a buffer amplifier used in a Second Circuit?
Typically a current buffer amplifier is used to transfer a current from a first circuit, having a low output impedance level, to a second circuit with a high input impedance level. The interposed buffer amplifier prevents the second circuit from loading the first circuit’s current unacceptably and interfering with its desired operation.