Bl4ckSh4rk

/* GSAcrypt - Gameboy Advance AR Crypto Program
 *
 * Copyright notice for this file:
 *  Copyright (C) 2001-2003 Parasyte
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *

chaitanyagupta

Reader Macros in Common Lisp

This post also appears on lisper.in.

Reader macros are perhaps not as famous as ordinary macros. While macros are a great way to create your own DSL, reader macros provide even greater flexibility by allowing you to create entirely new syntax on top of Lisp.

Paul Graham explains them very well in [On Lisp][] (Chapter 17, Read-Macros):

The three big moments in a Lisp expression's life are read-time, compile-time, and runtime. Functions are in control at runtime. Macros give us a chance to perform transformations on programs at compile-time. ...read-macros... do their work at read-time.

chendo

Application
Browser
BusyIndicator
Button
Cell
CheckBox
ColorWell
Column
ComboBox
DisclosureTriangle

RobBlackwell

(ql:quickload :cffi)

(cffi:load-foreign-library "user32.dll")

(cffi:defctype hwnd :unsigned-int)

(cffi:defcfun ("MessageBoxA" message-box) :int
  (wnd     hwnd)
  (text    :string)
  (caption :string)