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314 lines
10 KiB
C++
314 lines
10 KiB
C++
// Boost.Range library
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//
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// Copyright Neil Groves 2009. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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//
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// For more information, see http://www.boost.org/libs/range/
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//
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// The strided_defect_Trac5014 test case is a modified version of a test case
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// contributed by Michel Morin as part of the trac ticket.
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//
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// The deque test case has been removed due to erroneous standard library
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// implementations causing test failures.
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//
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#include <boost/range/adaptor/strided.hpp>
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#include <boost/config.hpp>
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#include <boost/test/test_tools.hpp>
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#include <boost/test/unit_test.hpp>
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#include <boost/assign.hpp>
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#include <boost/range/algorithm_ext.hpp>
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#include <algorithm>
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#include <vector>
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namespace boost
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{
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namespace
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{
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template< class Container >
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void strided_test_impl( Container& c, int stride_size )
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{
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using namespace boost::adaptors;
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// Rationale:
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// This requirement was too restrictive. It makes the use of the
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// strided adaptor too dangerous, and a simple solution existed
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// to make it safe, hence the strided adaptor has been modified
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// and this restriction no longer applies.
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//BOOST_ASSERT( c.size() % STRIDE_SIZE == 0 );
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Container reference;
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{
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typedef BOOST_DEDUCED_TYPENAME Container::const_iterator
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iterator_t BOOST_RANGE_UNUSED;
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typedef BOOST_DEDUCED_TYPENAME Container::difference_type
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diff_t BOOST_RANGE_UNUSED;
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typedef BOOST_DEDUCED_TYPENAME Container::size_type
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size_type BOOST_RANGE_UNUSED;
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iterator_t it = c.begin();
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iterator_t last = c.end();
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for (; it != last; )
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{
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reference.push_back(*it);
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for (int i = 0; (it != last) && (i < stride_size); ++i)
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++it;
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}
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}
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Container test;
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boost::push_back( test, c | strided(stride_size) );
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BOOST_CHECK_EQUAL_COLLECTIONS( test.begin(), test.end(),
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reference.begin(), reference.end() );
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Container test2;
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boost::push_back( test2, adaptors::stride(c, stride_size) );
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BOOST_CHECK_EQUAL_COLLECTIONS( test2.begin(), test2.end(),
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reference.begin(), reference.end() );
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// Test the const versions:
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const Container& cc = c;
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Container test3;
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boost::push_back( test3, cc | strided(stride_size) );
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BOOST_CHECK_EQUAL_COLLECTIONS( test3.begin(), test3.end(),
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reference.begin(), reference.end() );
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Container test4;
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boost::push_back( test4, adaptors::stride(cc, stride_size) );
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BOOST_CHECK_EQUAL_COLLECTIONS( test4.begin(), test4.end(),
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reference.begin(), reference.end() );
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}
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template< class Container >
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void strided_test_impl(int stride_size)
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{
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using namespace boost::assign;
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Container c;
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// Test empty
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strided_test_impl(c, stride_size);
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// Test two elements
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c += 1,2;
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strided_test_impl(c, stride_size);
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// Test many elements
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c += 1,1,1,2,2,3,4,5,6,6,6,7,8,9;
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strided_test_impl(c, stride_size);
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// Test an odd number of elements to determine that the relaxation
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// of the requirements has been successful
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// Test a sequence of length 1 with a stride of 2
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c.clear();
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c += 1;
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strided_test_impl(c, stride_size);
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// Test a sequence of length 2 with a stride of 2
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c.clear();
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c += 1,2;
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strided_test_impl(c, stride_size);
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// Test a sequence of length 3 with a stride of 2
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c.clear();
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c += 1,2,3;
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strided_test_impl(c, stride_size);
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}
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template<typename Container>
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void strided_test_zero_stride()
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{
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Container c;
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c.push_back(1);
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typedef boost::strided_range<Container> strided_range_t;
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strided_range_t rng( boost::adaptors::stride(c, 0) );
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boost::ignore_unused_variable_warning(rng);
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typedef BOOST_DEDUCED_TYPENAME boost::range_iterator<strided_range_t>::type iter_t;
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typedef BOOST_DEDUCED_TYPENAME boost::iterator_traversal<
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BOOST_DEDUCED_TYPENAME Container::const_iterator
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>::type container_traversal_tag;
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iter_t first = boost::range_detail::make_begin_strided_iterator(
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c, 0, container_traversal_tag());
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iter_t last = boost::range_detail::make_end_strided_iterator(
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c, 0, container_traversal_tag());
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iter_t it = first;
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for (int i = 0; i < 10; ++i, ++it)
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{
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BOOST_CHECK(it == first);
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}
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}
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template<typename Container>
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void strided_test_impl()
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{
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strided_test_zero_stride< Container >();
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const int MAX_STRIDE_SIZE = 10;
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for (int stride_size = 1; stride_size <= MAX_STRIDE_SIZE; ++stride_size)
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{
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strided_test_impl< Container >(stride_size);
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}
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}
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void strided_test()
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{
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strided_test_impl< std::vector<int> >();
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strided_test_impl< std::list<int> >();
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}
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void strided_defect_Trac5014()
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{
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using namespace boost::assign;
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std::vector<int> v;
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for (int i = 0; i < 30; ++i)
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v.push_back(i);
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std::vector<int> reference;
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reference += 0,4,8,12,16,20,24,28;
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std::vector<int> output;
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boost::push_back(output, v | boost::adaptors::strided(4));
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BOOST_CHECK_EQUAL_COLLECTIONS( reference.begin(), reference.end(),
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output.begin(), output.end() );
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BOOST_CHECK_EQUAL( output.back(), 28 );
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}
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template<typename BaseIterator, typename Category>
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class strided_mock_iterator
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: public boost::iterator_adaptor<
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strided_mock_iterator<BaseIterator,Category>
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, BaseIterator
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, boost::use_default
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, Category
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>
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{
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typedef boost::iterator_adaptor<
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strided_mock_iterator
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, BaseIterator
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, boost::use_default
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, Category
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> super_t;
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public:
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explicit strided_mock_iterator(BaseIterator it)
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: super_t(it)
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{
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}
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private:
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void increment()
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{
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++(this->base_reference());
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}
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friend class boost::iterator_core_access;
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};
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template<typename Category, typename Range>
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boost::iterator_range<strided_mock_iterator<BOOST_DEDUCED_TYPENAME boost::range_iterator<Range>::type, Category> >
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as_mock_range(Range& rng)
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{
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typedef BOOST_DEDUCED_TYPENAME boost::range_iterator<Range>::type range_iter_t;
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typedef strided_mock_iterator<range_iter_t, Category> mock_iter_t;
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return boost::iterator_range<mock_iter_t>(
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mock_iter_t(boost::begin(rng)),
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mock_iter_t(boost::end(rng)));
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}
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void strided_test_traversal()
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{
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using namespace boost::assign;
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std::vector<int> v;
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for (int i = 0; i < 30; ++i)
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v.push_back(i);
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std::vector<int> reference;
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reference += 0,4,8,12,16,20,24,28;
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std::vector<int> output;
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boost::push_back(output, as_mock_range<boost::forward_traversal_tag>(v) | boost::adaptors::strided(4));
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BOOST_CHECK_EQUAL_COLLECTIONS( reference.begin(), reference.end(),
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output.begin(), output.end() );
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output.clear();
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boost::push_back(output, as_mock_range<boost::bidirectional_traversal_tag>(v) | boost::adaptors::strided(4));
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BOOST_CHECK_EQUAL_COLLECTIONS( reference.begin(), reference.end(),
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output.begin(), output.end() );
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output.clear();
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boost::push_back(output, as_mock_range<boost::random_access_traversal_tag>(v) | boost::adaptors::strided(4));
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BOOST_CHECK_EQUAL_COLLECTIONS( reference.begin(), reference.end(),
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output.begin(), output.end() );
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}
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template<typename Range>
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void strided_test_ticket_5236_check_bidirectional(const Range& rng)
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{
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BOOST_CHECK_EQUAL( boost::distance(rng), 1 );
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BOOST_CHECK_EQUAL( std::distance(boost::begin(rng), boost::prior(boost::end(rng))), 0 );
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}
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template<typename Range>
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void strided_test_ticket_5236_check(const Range& rng)
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{
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strided_test_ticket_5236_check_bidirectional(rng);
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typename boost::range_iterator<const Range>::type it = boost::end(rng);
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it = it - 1;
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BOOST_CHECK_EQUAL( std::distance(boost::begin(rng), it), 0 );
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}
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void strided_test_ticket_5236()
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{
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std::vector<int> v;
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v.push_back(1);
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strided_test_ticket_5236_check( v | boost::adaptors::strided(2) );
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// Ensure that there is consistency between the random-access implementation
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// and the bidirectional.
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std::list<int> l;
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l.push_back(1);
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strided_test_ticket_5236_check_bidirectional( l | boost::adaptors::strided(2) );
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}
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}
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}
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boost::unit_test::test_suite*
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init_unit_test_suite(int argc, char* argv[])
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{
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boost::unit_test::test_suite* test
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= BOOST_TEST_SUITE( "RangeTestSuite.adaptor.strided" );
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test->add( BOOST_TEST_CASE( &boost::strided_test ) );
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test->add( BOOST_TEST_CASE( &boost::strided_defect_Trac5014 ) );
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test->add( BOOST_TEST_CASE( &boost::strided_test_traversal ) );
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test->add( BOOST_TEST_CASE( &boost::strided_test_ticket_5236 ) );
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return test;
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}
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