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irange: introduce one-parameter variant of irange

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this simplifies the use of boost::irange, as boost::irange( 0, foo );
may compile or not depending on the platform-specific integer type of
foo, requiring an explicit cast of 0 to decltype(foo).
This commit is contained in:
Tim Blechmann
2016-01-17 11:40:55 +01:00
parent 5a37aa4e98
commit bb43887430
3 changed files with 59 additions and 11 deletions
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test/irange.cpp
+45 -7
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@@ -18,6 +18,23 @@
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)
@@ -34,36 +51,52 @@ namespace boost
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;
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.
@@ -102,6 +135,11 @@ namespace boost
// 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);
@@ -124,14 +162,14 @@ namespace boost
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);