libs/gil/test/core/test_fixture.hpp
//
// Copyright 2019 Mateusz Loskot <mateusz at loskot dot net>
//
// Distributed under 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
//
#ifndef BOOST_GIL_TEST_CORE_TEST_FIXTURE_HPP
#define BOOST_GIL_TEST_CORE_TEST_FIXTURE_HPP
#include <boost/assert.hpp>
#include <boost/gil/promote_integral.hpp>
#include <cstdint>
#include <initializer_list>
#include <limits>
#include <random>
#include <tuple>
#include <type_traits>
namespace boost { namespace gil { namespace test { namespace fixture {
template <typename T>
struct consecutive_value
{
consecutive_value(T start) : current_(start)
{
BOOST_ASSERT(static_cast<int>(current_) >= 0);
}
T operator()()
{
BOOST_ASSERT(static_cast<int>(current_) + 1 > 0);
current_++;
return current_;
}
T current_;
};
template <typename T>
struct reverse_consecutive_value
{
reverse_consecutive_value(T start) : current_(start)
{
BOOST_ASSERT(static_cast<int>(current_) > 0);
}
T operator()()
{
BOOST_ASSERT(static_cast<int>(current_) + 1 >= 0);
current_--;
return current_;
}
T current_;
};
template <typename T>
struct random_value
{
static_assert(std::is_integral<T>::value, "T must be integral type");
random_value(T range_min = std::numeric_limits<T>::min(),
T range_max = std::numeric_limits<T>::max())
: uid_(range_min, range_max)
{}
random_value(std::uint32_t seed, T minimum, T maximum) : rng_(seed), uid_(minimum, maximum)
{}
T operator()()
{
return uid_(rng_);
}
T range_min() const noexcept
{
return uid_.a();
}
T range_max() const noexcept
{
return uid_.b();
}
std::mt19937 rng_;
std::uniform_int_distribution<typename gil::promote_integral<T>::type> uid_;
};
}}}} // namespace boost::gil::test::fixture
#endif