Ichthyostega
806db414dd
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106 lines
2.5 KiB
C++
106 lines
2.5 KiB
C++
/*
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UtilTuple(Test) - helpers and shortcuts for working with tuples
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Copyright (C)
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2023, 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 util-tuple-test.cpp
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** unit test \ref UtilTuple_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/util-tuple.hpp"
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#include "lib/iter-adapter.hpp"
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#include "lib/util.hpp"
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#include <vector>
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using ::Test;
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using util::isnil;
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using std::tuple_size_v;
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namespace util {
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namespace test {
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using VecI = std::vector<uint>;
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using RangeI = lib::RangeIter<VecI::iterator>;
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namespace{ // Test data and operations
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VecI
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someNumbz (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 for interplay
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* of tuples and iterable sequences:.
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* - unpack a sequence into a tuple of references
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*/
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class UtilTuple_test : public Test
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{
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void
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run (Arg)
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{
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verify_unpackIterator();
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}
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/**
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* @test unpack a sequence into a tuple of references,
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* usable for structural binding.
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*/
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void
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verify_unpackIterator()
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{
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VecI container = someNumbz (5);
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RangeI iterator(container.begin(), container.end());
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CHECK (not isnil (iterator));
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auto tup = seqTuple<5> (iterator);
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CHECK ( isnil (iterator)); // iterator was exhausted on unpacking...
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CHECK (5 == tuple_size_v<decltype(tup)>);
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auto& [g,f,e,d,c] = tup;
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CHECK (c == 1);
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CHECK (d == 2);
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CHECK (e == 3);
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CHECK (f == 4);
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CHECK (g == 5);
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g = 55; // we indeed got references...
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CHECK (55 == std::get<0> (tup));
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CHECK (55 == container.front());
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}
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};
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LAUNCHER (UtilTuple_test, "unit common");
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}} // namespace util::test
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