Ichthyostega
20392eee1c
This resolves an intricate problem related to metaprogramming with variadic templates and function signatures. Due to exceptional complexity, a direct solution was blocked for several years, and required a better organisation of the support code involved; several workarounds were developed, gradually leading to a transition path, which could now be completed in an focused clean-up effort over the last week. Metaprogramming with sequences of types is organised into three layers: - simple tasks can be solved with the standard facilities of the language, using pattern match with variadic template specialisations - the ''type-sequence'' construct `Types<T...>` takes the centre stage for the explicit definition of collections of types; it can be re-bound to other variadic templates and supports simple direct manipulation - for more elaborate and advanced processing tasks, a ''Loki-style type list'' can be obtained from a type-sequence, allowing to perform recursive list processing task with a technique similar to LISP.
79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
/*
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FormatSupport(Test) - verify the configuration to support a specific format
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Copyright (C)
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2011, Hermann Vosseler <Ichthyostega@web.de>
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**Lumiera** is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version. See the file COPYING for further details.
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* *****************************************************************/
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/** @file format-support-test.cpp
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** unit test \ref FormatSupport_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/time/formats.hpp"
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namespace lib {
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namespace time {
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namespace format{
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namespace test {
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/****************************************************//**
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* @test check how support for a specific timecode format
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* can be enabled and detected. Actually this test
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* verifies a simple metaprogramming facility,
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* which allows to check type support at runtime.
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*/
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class FormatSupport_test : public Test
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{
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virtual void
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run (Arg)
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{
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SupportStandardTimecode just_fine;
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Supported just_smpte = Supported::formats< Types<Smpte> >();
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Supported just_simple = Supported::formats< Types<Frames,Seconds> >();
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Supported& support1 (just_fine);
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Supported& support2 (just_smpte);
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Supported& support3 (just_simple);
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CHECK ( support1.check<Hms>());
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CHECK ( support1.check<Smpte>());
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CHECK ( support1.check<Frames>());
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CHECK ( support1.check<Seconds>());
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CHECK (!support2.check<Hms>());
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CHECK ( support2.check<Smpte>());
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CHECK (!support2.check<Frames>());
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CHECK (!support2.check<Seconds>());
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CHECK (!support3.check<Hms>());
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CHECK (!support3.check<Smpte>());
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CHECK ( support3.check<Frames>());
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CHECK ( support3.check<Seconds>());
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// format support descriptors are assignable
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just_smpte = just_simple;
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CHECK (support2.check<Hms>() == support3.check<Hms>());
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CHECK (support2.check<Smpte>() == support3.check<Smpte>());
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CHECK (support2.check<Frames>() == support3.check<Frames>());
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CHECK (support2.check<Seconds>() == support3.check<Seconds>());
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}
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};
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/** Register this test class... */
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LAUNCHER (FormatSupport_test, "unit common");
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}}}} // namespace lib::time::format::test
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