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- // Boost.Range library
- //
- // Copyright Neil Groves 2009. Use, modification and
- // distribution is subject to the Boost Software License, Version
- // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- //
- //
- // For more information, see http://www.boost.org/libs/range/
- //
- #include <boost/range/adaptor/filtered.hpp>
- #include <boost/test/test_tools.hpp>
- #include <boost/test/unit_test.hpp>
- #include <boost/assign.hpp>
- #include <boost/range/algorithm_ext.hpp>
- #include <algorithm>
- #include <list>
- #include <set>
- #include <string>
- #include <vector>
- #include <sstream>
- namespace boost
- {
- namespace
- {
- struct always_false_pred
- {
- template< class T1 >
- bool operator()(T1) const { return false; }
- };
- struct always_true_pred
- {
- template< class T1 >
- bool operator()(T1) const { return true; }
- };
- struct is_even
- {
- template< class IntegerT >
- bool operator()( IntegerT x ) const { return x % 2 == 0; }
- };
- struct is_odd
- {
- template< class IntegerT >
- bool operator()( IntegerT x ) const { return x % 2 != 0; }
- };
- struct lambda_init
- {
- };
- struct lambda
- {
- lambda(const lambda_init& init) {}
- lambda(const lambda& rhs) {}
- template< class T1 >
- bool operator()(T1) const { return false; }
- private:
- lambda() {}
- lambda& operator=(const lambda& rhs) { return *this; }
- };
- template< class Container, class Pred >
- void filtered_test_impl( Container& c, Pred pred )
- {
- using namespace boost::adaptors;
- typedef BOOST_DEDUCED_TYPENAME Container::value_type value_t;
- // This is my preferred syntax using the | operator.
- std::vector< value_t > test_result1;
- boost::push_back(test_result1, c | filtered(pred));
- // This is an alternative syntax preferred by some.
- std::vector< value_t > test_result2;
- boost::push_back(test_result2, adaptors::filter(c, pred));
- // Calculate the reference result.
- std::vector< value_t > reference_result;
- typedef BOOST_DEDUCED_TYPENAME Container::const_iterator iter_t;
- for (iter_t it = c.begin(); it != c.end(); ++it)
- {
- if (pred(*it))
- reference_result.push_back(*it);
- }
- BOOST_CHECK_EQUAL_COLLECTIONS( reference_result.begin(),
- reference_result.end(),
- test_result1.begin(),
- test_result1.end() );
- BOOST_CHECK_EQUAL_COLLECTIONS( reference_result.begin(),
- reference_result.end(),
- test_result2.begin(),
- test_result2.end() );
- }
- template< class Rng >
- void check_copy_assign(Rng r)
- {
- Rng r2 = r;
- r2 = r;
- }
- template< class Container, class Pred >
- void filtered_range_copy_assign(Container& c, Pred pred)
- {
- using namespace boost::adaptors;
- check_copy_assign(c | filtered(pred));
- check_copy_assign(adaptors::filter(c, pred));
- }
- template< class Container, class Pred, class PredInit >
- void filtered_test_impl()
- {
- using namespace boost::assign;
- Container c;
- PredInit init;
- Pred pred(init);
- // test empty container
- filtered_test_impl(c, pred);
- // test one element
- c += 1;
- filtered_test_impl(c, pred);
- // test many elements
- c += 1,2,2,2,3,4,4,4,4,5,6,7,8,9,9;
- filtered_test_impl(c, pred);
- // test the range and iterator are copy assignable
- filtered_range_copy_assign(c, pred);
- }
- template< class Container >
- void filtered_test_all_predicates()
- {
- filtered_test_impl< Container, always_false_pred, always_false_pred >();
- filtered_test_impl< Container, always_true_pred, always_true_pred >();
- filtered_test_impl< Container, is_odd, is_odd >();
- filtered_test_impl< Container, is_even, is_even >();
- filtered_test_impl< Container, lambda, lambda_init >();
- }
- void ticket_10988_single_pass()
- {
- std::vector<int> v;
- std::string str("0 1 2 3 4 5");
- std::istringstream in(str);
- boost::push_back(v,
- boost::make_iterator_range(
- std::istream_iterator<int>(in),
- std::istream_iterator<int>())
- | boost::adaptors::filtered(is_even()));
- std::vector<int> reference;
- for (int i = 0; i < 6; i += 2)
- {
- reference.push_back(i);
- }
- BOOST_CHECK_EQUAL_COLLECTIONS(
- reference.begin(), reference.end(),
- v.begin(), v.end());
- }
- void filtered_test()
- {
- filtered_test_all_predicates< std::vector< int > >();
- filtered_test_all_predicates< std::list< int > >();
- filtered_test_all_predicates< std::set< int > >();
- filtered_test_all_predicates< std::multiset< int > >();
- ticket_10988_single_pass();
- }
- }
- }
- boost::unit_test::test_suite*
- init_unit_test_suite(int argc, char* argv[])
- {
- boost::unit_test::test_suite* test
- = BOOST_TEST_SUITE( "RangeTestSuite.adaptor.filtered" );
- test->add( BOOST_TEST_CASE( &boost::filtered_test ) );
- return test;
- }
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