Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from http://www.lispworks.com/documentation/lw71/LW/html/lw-1463.htm below:

typed-aref

The function typed-aref allows efficient access to a typed aref vector.

The following values of type are accepted:

• double-float
• float
• single-float
• sys:int32
• (unsigned-byte 32)
• (signed-byte 32)
• (unsigned-byte 16)
• (signed-byte 16)
• (unsigned-byte 8)
• (signed-byte 8)

Additionally in 64-bit LispWorks only, the following values of type are also accepted:

• sys:int64
• (unsigned-byte 64)
• (signed-byte 64)

vector must be an object returned by make-typed-aref-vector.

byte-index specifies the index in 8-bit bytes from the start of the data in the vector. It must be a non-negative fixnum which is less than the byte-length argument passed to make-typed-aref-vector.

typed-aref and (setf typed-aref) will be inlined to code which is as efficient as possible when compiled with (optimize (safety 0)) and a constant type. As usual, you need to add (optimize (float 0)) to remove boxing for the float types.

(defun double-float-typed-aref-incf (x y z)

  (declare (optimize (float 0) (safety 0)))

  (incf (sys:typed-aref 'double-float x y)

        (the double-float z))

  x)

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4