The Racket repository
7ab8aca79b
Specifically, implementations for the #:defaults keyword in define-generics can now use define/generic to get at the generic implementation of a method for which a specific implementation is defined locally. Also, unimplemented methods are handled properly now in #:defaults. Previously, an unimplemented method in a #:defaults specification would go into an infinite loop if applied, because the implementation for the specific type wound up referring to the generic implementation of the method. A lot of the back-end implementation of generics changes in this commit: - The new module racket/private/generic-methods provides a uniform mechanism for defining method tables and recording static information about generics groups. Both #:methods in [define-]struct and #:defaults in define-generics use this framework now. In addition, generics based on existing properties such as gen:stream, gen:equal+hash, and gen:custom-write now use the struct from this module to store the names associated with the generics groups. - Generic methods now expand directly into functions with the appropriate arity, and refer directly to the appropriate argument to perform generic method dispatch. The previous implementation used procedure-reduce-keyword-arity to restrict the arity dynamically, and used list-ref to find the generic argument. - Some error messages have changed slightly; hopefully for the better, but this change did require some changes to tests for specific error messages. |
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This is the source code for the main Racket distribution. See "INSTALL.txt" for information on building Racket. License ------- Racket Copyright (c) 2010-2013 PLT Design Inc. Racket is distributed under the GNU Lesser General Public License (LGPL). This means that you can link Racket into proprietary applications, provided you follow the rules stated in the LGPL. You can also modify Racket; if you distribute a modified version, you must distribute it under the terms of the LGPL, which in particular means that you must release the source code for the modified software. See doc/release-notes/COPYING_LESSER.txt for more information.