Ichthyostega
8c12e88fd3
the reason for the failure, as it turned out, is that 'noexcept' is part of the function signature since C++17 And, since typically a STL container has const and non-const variants of the begin() and end() function, the match to a member function pointer became ambuguous, when probing with a signature without 'noexcept' However, we deliberately want to support "any STL container like" types, and this IMHO should include types with a possibly throwing iterator. The rationale is, sometimes we want to expose some element *generator* behind a container-like interface. At this point I did an investigation if we can emulate something in the way of a Concept -- i.e. rather than checking for the presence of some functions on the interface, better try to cover the necessary behaviour, like in a type class. Unfortunately, while doable, this turns out to become quite technical; and this highlights why the C++20 concepts are such an important addition to the language. So for the time being, we'll amend the existing solution and look ahead to C++20
137 lines
3.3 KiB
C++
137 lines
3.3 KiB
C++
/*
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UtilCollection(Test) - helpers and shortcuts for working with collections
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Copyright (C) Lumiera.org
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2012, 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 util-collection-test.cpp
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** unit test \ref UtilCollection_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/itertools.hpp"
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#include "lib/util-coll.hpp"
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#include "lib/iter-adapter.hpp"
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#include "lib/meta/trait.hpp"
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#include <boost/lexical_cast.hpp>
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#include <vector>
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using ::Test;
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using util::first;
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using util::last;
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using lib::meta::can_STL_ForEach;
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using lib::meta::can_IterForEach;
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using lib::meta::can_STL_backIteration;
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using boost::lexical_cast;
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namespace util {
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namespace test {
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typedef std::vector<uint> VecI;
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typedef lib::RangeIter<VecI::iterator> RangeI;
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namespace{ // Test data and operations
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uint NUM_ELMS = 20;
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VecI
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someNumberz (uint count)
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{
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VecI numbers;
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numbers.reserve(count);
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while (count)
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numbers.push_back(count--);
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return numbers;
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}
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} // (End) test data and operations
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/*****************************************************************//**
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* @test verify some convenience shortcuts and helpers dealing
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* with Collections and sequences (Iterators).
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* - metafunctions to distinguish STL containers and Lumiera Iterators
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* - get the first element
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* - get the last element
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*/
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class UtilCollection_test : public Test
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{
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void
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run (Arg arg)
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{
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verify_typeDetectors();
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if (0 < arg.size()) NUM_ELMS = lexical_cast<uint> (arg[0]);
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VecI container = someNumberz (NUM_ELMS);
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RangeI iterator(container.begin(), container.end());
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verify_accessFirstLast (container, NUM_ELMS);
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verify_accessFirstLast (iterator, NUM_ELMS);
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}
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template<class COL>
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void
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verify_accessFirstLast (COL const& col, uint lim)
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{
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uint theFirst = lim;
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uint theLast = 1;
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CHECK (first(col) == theFirst);
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CHECK (last(col) == theLast);
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}
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void
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verify_typeDetectors()
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{
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CHECK ( can_STL_ForEach<VecI>::value);
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CHECK ( can_STL_backIteration<VecI>::value);
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CHECK (!can_STL_ForEach<RangeI>::value);
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CHECK (!can_STL_backIteration<RangeI>::value);
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CHECK (!can_IterForEach<VecI>::value);
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CHECK ( can_IterForEach<RangeI>::value);
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}
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};
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LAUNCHER (UtilCollection_test, "unit common");
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}} // namespace util::test
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