irange.cpp
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// Boost.Range library
//
// Copyright Neil Groves 2010. 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/irange.hpp>
#include <boost/range/algorithm_ext.hpp>
#include <boost/range/begin.hpp>
#include <boost/range/end.hpp>
#include <boost/test/test_tools.hpp>
#include <boost/test/unit_test.hpp>
#include <vector>
namespace boost
{
// Test an integer range with a step size of 1.
template<typename Integer>
void test_irange_impl(Integer last)
{
std::vector<Integer> reference;
for (Integer i = static_cast<Integer>(0); i < last; ++i)
{
reference.push_back(i);
}
std::vector<Integer> test;
boost::push_back(test, boost::irange(last));
BOOST_CHECK_EQUAL_COLLECTIONS( test.begin(), test.end(),
reference.begin(), reference.end() );
}
// Test an integer range with a step size of 1.
template<typename Integer>
void test_irange_impl(Integer first, Integer last)
{
std::vector<Integer> reference;
for (Integer i = first; i < last; ++i)
{
reference.push_back(i);
}
std::vector<Integer> test;
boost::push_back(test, boost::irange(first, last));
BOOST_CHECK_EQUAL_COLLECTIONS( test.begin(), test.end(),
reference.begin(), reference.end() );
}
// Test an integer range with a runtime specified step size.
template<typename Integer, typename IntegerInput>
void test_irange_impl(IntegerInput first, IntegerInput last, int step)
{
BOOST_ASSERT( step != 0 );
// Skip tests that have negative values if the type is
// unsigned
if ((static_cast<IntegerInput>(static_cast<Integer>(first)) != first)
|| (static_cast<IntegerInput>(static_cast<Integer>(last)) != last))
return;
std::vector<Integer> reference;
const std::ptrdiff_t first_p = static_cast<std::ptrdiff_t>(first);
const std::ptrdiff_t last_p = static_cast<std::ptrdiff_t>(last);
const std::ptrdiff_t step_p = static_cast<std::ptrdiff_t>(step);
for (std::ptrdiff_t current_value = first_p;
step_p >= 0 ? current_value < last_p : current_value > last_p;
current_value += step_p)
reference.push_back(current_value);
std::vector<Integer> test;
boost::push_back(test, boost::irange(first, last, step));
BOOST_CHECK_EQUAL_COLLECTIONS( test.begin(), test.end(),
reference.begin(), reference.end() );
}
// Test driver function that for an integer range [first, last)
// drives the test implementation through various integer
// types.
void test_irange(int last)
{
test_irange_impl<signed char>(last);
test_irange_impl<unsigned char>(last);
test_irange_impl<signed short>(last);
test_irange_impl<unsigned short>(last);
test_irange_impl<signed int>(last);
test_irange_impl<unsigned int>(last);
test_irange_impl<signed long>(last);
test_irange_impl<unsigned long>(last);
}
// Test driver function that for an integer range [first, last)
// drives the test implementation through various integer
// types.
void test_irange(int first, int last)
{
test_irange_impl<signed char>(first,last);
test_irange_impl<unsigned char>(first, last);
test_irange_impl<signed short>(first, last);
test_irange_impl<unsigned short>(first, last);
test_irange_impl<signed int>(first, last);
test_irange_impl<unsigned int>(first, last);
test_irange_impl<signed long>(first, last);
test_irange_impl<unsigned long>(first, last);
}
// Test driver function that for an integer range [first, last)
// drives the test implementation through various integer
// types step_size items at a time.
void test_irange(int first, int last, int step_size)
{
BOOST_ASSERT( step_size != 0 );
test_irange_impl<signed char>(first, last, step_size);
test_irange_impl<unsigned char>(first, last, step_size);
test_irange_impl<signed short>(first, last, step_size);
test_irange_impl<unsigned short>(first, last, step_size);
test_irange_impl<signed int>(first, last, step_size);
test_irange_impl<unsigned int>(first, last, step_size);
test_irange_impl<signed long>(first, last, step_size);
test_irange_impl<unsigned long>(first, last, step_size);
}
// Implementation of the unit test for the integer range
// function.
// This starts the test drivers to drive a set of integer types
// for a combination of range values chosen to exercise a large
// number of implementation branches.
void irange_unit_test()
{
// Test the single-step version of irange(last)
test_irange(0);
test_irange(1);
test_irange(10);
// Test the single-step version of irange(first, last)
test_irange(0, 0);
test_irange(0, 1);
test_irange(0, 10);
test_irange(1, 1);
test_irange(1, 2);
test_irange(1, 11);
// Test the n-step version of irange(first, last, step-size)
test_irange(0, 0, 1);
test_irange(0, 0, -1);
test_irange(0, 10, 1);
test_irange(10, 0, -1);
test_irange(0, 2, 2);
test_irange(2, 0, -2);
test_irange(0, 9, 2);
test_irange(9, 0, -2);
test_irange(-9, 0, 2);
test_irange(-9, 9, 2);
test_irange(9, -9, -2);
test_irange(10, 20, 5);
test_irange(20, 10, -5);
test_irange(0, 0, 3);
test_irange(0, 1, 3);
test_irange(0, 2, 3);
test_irange(0, 3, 3);
test_irange(0, 4, 3);
test_irange(0, 10, 3);
test_irange(0, 0, -3);
test_irange(0, -1, -3);
test_irange(0, -2, -3);
test_irange(0, -3, -3);
test_irange(0, -4, -3);
test_irange(0, -10, -3);
}
} // namespace boost
boost::unit_test::test_suite*
init_unit_test_suite(int argc, char* argv[])
{
boost::unit_test::test_suite* test
= BOOST_TEST_SUITE( "RangeTestSuite.irange" );
test->add(BOOST_TEST_CASE( &boost::irange_unit_test ));
return test;
}