Ichthyostega
b8cf274de6
due to switching from ADL extension points to member functions, we now need to detect a "state core" type in a different fashion. The specific twist is that we can not spell out the full signature in all cases, since the result type will be formed as a consequence of this type detection. Thus there are now additional detectors to probe for the presence of a specific function name only, and the distinction between members and member functions has been sharpened.
98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
/*
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DuckDetector(Test) - detecting properties of a type at compile time
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Copyright (C) Lumiera.org
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2010, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file duck-detector-test.cpp
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** unit test \ref DuckDetector_test:
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** duck typing through metaprogramming
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*/
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#include "lib/test/run.hpp"
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#include "lib/meta/duck-detector.hpp"
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#include "lib/format-cout.hpp"
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#include "lib/util.hpp"
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namespace lib {
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namespace meta{
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namespace test{
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namespace { // some test ducks....
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struct PropperGander
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{
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class Core;
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PropperGander& honk (long,long);
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};
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struct Propaganda
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{
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void honk(float);
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};
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}//(End) with test ducks
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#define SHOW_CHECK(_EXPR_) cout << STRINGIFY(_EXPR_) << "\t : " << (_EXPR_::value? "Yes":"No") << endl;
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/*******************************************************************************//**
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* @test verify building predicates to detect properties of a type at compile time.
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* Especially, this allows us to detect if a type in question
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* - has a nested type with a specific name
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* - has a member with a specific name
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* - defines a function with a specific signature
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*/
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class DuckDetector_test : public Test
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{
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META_DETECT_NESTED(Core);
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META_DETECT_MEMBER(honk);
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META_DETECT_FUNCTION(PropperGander&, honk, (long,long));
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void
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run (Arg)
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{
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SHOW_CHECK( HasNested_Core<PropperGander> );
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SHOW_CHECK( HasNested_Core<Propaganda> );
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SHOW_CHECK( HasMember_honk<PropperGander> );
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SHOW_CHECK( HasMember_honk<Propaganda> );
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SHOW_CHECK( HasFunSig_honk<PropperGander> );
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SHOW_CHECK( HasFunSig_honk<Propaganda> );
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}
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};
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/** Register this test class... */
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LAUNCHER (DuckDetector_test, "unit meta");
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}}} // namespace lib::meta::test
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