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cexcept: README 2.0.1 (2008-Jul-23-Wed) http://www.nicemice.net/cexcept/ Adam M. Costello http://www.nicemice.net/amc/ cexcept (pronounced "see except" in English) is a package providing a Try/Catch/Throw exception handling interface for ANSI C (C89 and subsequent ISO standards). It does not attempt to handle system exceptions like floating-point exceptions or addressing exceptions, nor compiler-generated exceptions like C++ exceptions; it is intended as an enhanced user-friendly alternative to setjmp() and longjmp(). The package consists of the following files: name version ---------- ------- README 2.0.1 cexcept.h 2.0.1 example1.c 2.0.0 example2.c 2.0.0 rationale 2.0.0 The package is both free-as-in-speech and free-as-in-beer: Copyright (c) 2000-2008 Adam M. Costello and Cosmin Truta. This package may be modified only if its author and version information is updated accurately, and may be redistributed only if accompanied by this unaltered notice. Subject to those restrictions, permission is granted to anyone to do anything with this package. The copyright holders make no guarantees regarding this package, and are not responsible for any damage resulting from its use. The version number of this README file can be considered the version number of the whole package. The file cexcept.h contains the documentation and implementation of the interface. The other files are supporting documents. The project web page is: http://www.nicemice.net/cexcept/ Here is another place to obtain the package, not guaranteed to always have the very latest version, but probably more highly available: http://cexcept.sourceforge.net/ The remainder of this file is a log of changes. 2008-Jul-23-Wed cexcept.h 2.0.0 --> 2.0.1 * Clarified the license. * Reworded the introductory comments. * Bug fix: The statement following Try could not be an if-statement (without else); the Catch would then be parsed wrong. * Quieted a new warning in gcc 4.2. README 2.0.0 --> 2.0.1 * Reworded the license to agree with cexcept.h. * Updated the URLs. 2001-Jul-12-Thu cexcept.h 1.0.0 --> 2.0.0 * The documentation had neglected to mention that the Catch expression was evaluated before the Try clause was executed. Rather than document this unintuitive behavior, we have changed the interface so that the Catch expression is not evaluated unless and until an exception is caught. This change will not affect applications that never used Catch expressions with side effects. * The implementation had been technically incorrect because it modified the object named by the Catch expression between the setjmp and longjmp calls, even though it might be a non-volatile automatic object (which it was in example.c). The problem (which affected no known compilers) has been corrected by performing two copies: first into volatile temporary storage before the longjmp, then into the Catch expression after the longjmp. * The requirement that the Catch expression have the "exact same type" that was passed to define_exception_type() has been slightly relaxed to disregard type qualifiers. * In the license, "no guarantees about the correctness of this file" has been changed to "no guarantees regarding this file". * Notes have been added that "real" exceptions are not supported, and the size of the exception type has performance implications. rationale 1.0.0 --> 2.0.0 * Removed the obsolete question about why the Catch expression is always evaluated. * Updated the answer to the question about the type of the Catch expression, to correspond to the new implementation. * Added a question about why two copies are necessary. * Added a question about why "real" exceptions cannot be caught. example.c 1.0.0 --> example1.c 2.0.0 example2.c 1.0.0 --> 2.0.0 * Renamed example.c to example1.c. * Changed the version number to agree with cexcept.h in the first two places (2.0.*). README 1.0.0 --> 2.0.0 * Reworded the license to agree with cexcept.h. * Changed the version number to agree with cexcept.h in the first two places (2.0.*). 2000-Jun-21-Wed cexcept.h 0.6.1 --> 1.0.0 * Changed the version number to indicate stability. * Changed "an lvalue" to "a modifiable lvalue" to agree with the language in the ISO C Standard. * Added hints about dealing with the inability to return from a Try clause, and with automatic variables modified within a Try clause. * Clarified the restriction on Throw'ing a comma-expression. example.c 0.6.0 --> 1.0.0 * Changed the version number to agree with cexcept.h in the first two places (1.0.*). example2.c 0.6.0 --> 1.0.0 * Changed the version number to agree with cexcept.h in the first two places (1.0.*). rationale 0.6.1 --> 1.0.0 * Changed the version number to agree with cexcept.h in the first two places (1.0.*). README 0.6.3 --> 1.0.0 * Changed the version number to agree with cexcept.h in the first two places (1.0.*). 2000-Apr-22-Sat cexcept.h 0.6.0 --> 0.6.1 * Clarified that the wrapper .h file is needed only when there are multiple .c files. 2000-Apr-08-Sat rationale 0.6.0 --> 0.6.1 * Added rationale for disallowing jumping in/out of Try clauses. * Expanded the discussion of finally clauses. * Added rationale for the lack of expressionless Throw. 2000-Apr-07-Fri Created README, which incorporates changelog. cexcept.h amc.0.5.3 --> 0.6.0 * The expression passed to Catch must now have exactly the same type passed to define_exception_type(), and it is always evaluated exactly once, regardless of whether an exception is caught. * Added Catch_anonymous. * Changed init_exception_context() to take an argument, and to be optional for statically allocated contexts. * Clarified allowable exception types, added examples. * Clarified the restrictions on jumping in Try/Catch statements. * Reworded some other parts of the documentation. cexcept-example.c amc.0.5.0 --> example.c 0.6.0 * Now uses the 0.6.* interface, and demonstrates Catch_anonymous. cexcept-example2.c amc.0.5.0 --> example2.c 0.6.0 * Now uses the 0.6.* interface. cexcept-rationale amc.0.5.1 --> rationale 0.6.0 * Added rationale for the new Catch expression semantics. 2000-Apr-01-Fri cexcept.h amc.0.5.2 --> amc.0.5.3 * Eliminated a compiler warning about an uninitialized variable. * Improved the documentation of allowable exception types. * Added advice about using a macro for the_exception_context, and changed the example accordingly. * Improved the documentation regarding jumping out of Try and Catch. Earlier changes were not logged.