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This section describes the functions to create, delete and move
overlays, and to examine their contents.
- Function: make-overlay start end &optional buffer
-
This function creates and returns an overlay that belongs to
buffer and ranges from start to end. Both start
and end must specify buffer positions; they may be integers or
markers. If buffer is omitted, the overlay is created in the
current buffer.
- Function: overlay-start overlay
-
This function returns the position at which overlay starts.
- Function: overlay-end overlay
-
This function returns the position at which overlay ends.
- Function: overlay-buffer overlay
-
This function returns the buffer that overlay belongs to.
- Function: delete-overlay overlay
-
This function deletes overlay. The overlay continues to exist as
a Lisp object, but ceases to be part of the buffer it belonged to, and
ceases to have any effect on display.
- Function: move-overlay overlay start end &optional buffer
-
This function moves overlay to buffer, and places its bounds
at start and end. Both arguments start and end
must specify buffer positions; they may be integers or markers. If
buffer is omitted, the overlay stays in the same buffer.
The return value is overlay.
This is the only valid way to change the endpoints of an overlay. Do
not try modifying the markers in the overlay by hand, as that fails to
update other vital data structures and can cause some overlays to be
"lost".
- Function: overlays-at pos
-
This function returns a list of all the overlays that contain position
pos in the current buffer. The list is in no particular order.
An overlay contains position pos if it begins at or before
pos, and ends after pos.
- Function: next-overlay-change pos
-
This function returns the buffer position of the next beginning or end
of an overlay, after pos.
- Function: previous-overlay-change pos
-
This function returns the buffer position of the previous beginning or
end of an overlay, before pos.
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