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YOMM11 IS DEPRECATED
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In 2017 I learned the D language, and I implemented an open method library for D. In the process I had a few fresh ideas, some of which are applicable to C++. Also, my colleague David Goffredo educated me on the power of modern preprocessor macros.
I will no longer actively develop Yomm11 but I will consider PRs. I strongly recommend switching to Yomm2 though.
This library implements open multi-methods for C++11.
Salient features are:
syntax: is relatively uncluttered. There are no limitations on the number of virtual arguments. Virtual and non-virtual arguments can be arbitrarily mixed. Virtual and multiple inheritance are supported.
speed: close to a virtual function call when the hierarchies involved in the virtual arguments collaborate with the library. Calling a method that does nothing, with a single virtual argument in a single inheritance hierarchy is 33% slower than the equivalent virtual function call. The difference becomes unnoticeable if the functions perform a few simple maths operations. See tests/benchmarks.cpp.
size: dispatch tables are constructed in terms of class groups. This results in a tables devoid of redundancies.
support for "foreign" class hierarchies: the library can be used without modifications to existing classes, at the cost of lower performance. Collaborating and foreign arguments can be freely mixed. Performance is still quite good, see the benchmarks.
next: a pointer to the next most specialized method is available inside method specializations - see examples/next.cpp. Alternatively, it is possible to call a specialization directly.
Support and discussions: yomm11 on Google Groups (https://groups.google.com/forum/#!forum/yomm11)
Author: Jean-Louis Leroy - firstname.lastname@example.org