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- /*=============================================================================
- Copyright (c) 2017 Paul Fultz II
- tuple_transform.cpp
- 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)
- ==============================================================================*/
- #include <boost/hof/proj.hpp>
- #include <boost/hof/construct.hpp>
- #include <boost/hof/unpack.hpp>
- #include <boost/hof/function.hpp>
- #include <boost/hof/placeholders.hpp>
- #include <boost/hof/compose.hpp>
- // Disable static checks for gcc 4.7
- #ifndef BOOST_HOF_HAS_STATIC_TEST_CHECK
- #if (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 8)
- #define BOOST_HOF_HAS_STATIC_TEST_CHECK 0
- #endif
- #endif
- #include "test.hpp"
- struct tuple_transform_f
- {
- template<class Sequence, class F>
- constexpr auto operator()(Sequence&& s, F f) const BOOST_HOF_RETURNS
- (
- boost::hof::unpack(boost::hof::proj(f, boost::hof::construct<std::tuple>()))(boost::hof::forward<Sequence>(s))
- );
- };
- struct pack_transform_f
- {
- template<class Sequence, class F>
- constexpr auto operator()(Sequence&& s, F f) const BOOST_HOF_RETURNS
- (
- boost::hof::unpack(boost::hof::proj(f, boost::hof::pack()))(boost::hof::forward<Sequence>(s))
- );
- };
- BOOST_HOF_STATIC_FUNCTION(tuple_transform) = tuple_transform_f{};
- // BOOST_HOF_STATIC_FUNCTION(pack_transform) = pack_transform_f{};
- #if !BOOST_HOF_HAS_CONSTEXPR_TUPLE
- #define TUPLE_TRANSFORM_STATIC_CHECK(...)
- #else
- #define TUPLE_TRANSFORM_STATIC_CHECK BOOST_HOF_STATIC_TEST_CHECK
- #endif
- BOOST_HOF_TEST_CASE()
- {
- auto t = std::make_tuple(1, 2);
- auto r = tuple_transform(t, [](int i) { return i*i; });
- BOOST_HOF_TEST_CHECK(r == std::make_tuple(1, 4));
- }
- BOOST_HOF_TEST_CASE()
- {
- TUPLE_TRANSFORM_STATIC_CHECK(tuple_transform(std::make_tuple(1, 2), boost::hof::_1 * boost::hof::_1) == std::make_tuple(1, 4));
- }
- #define TUPLE_TRANSFORM_CHECK_ID(x) \
- BOOST_HOF_TEST_CHECK(tuple_transform(x, boost::hof::identity) == x); \
- TUPLE_TRANSFORM_STATIC_CHECK(tuple_transform(x, boost::hof::identity) == x);
- BOOST_HOF_TEST_CASE()
- {
- TUPLE_TRANSFORM_CHECK_ID(std::make_tuple(1, 2));
- TUPLE_TRANSFORM_CHECK_ID(std::make_tuple(1));
- TUPLE_TRANSFORM_CHECK_ID(std::make_tuple());
- }
- BOOST_HOF_TEST_CASE()
- {
- auto x = tuple_transform(std::make_tuple(std::unique_ptr<int>(new int(3))), boost::hof::identity);
- auto y = std::make_tuple(std::unique_ptr<int>(new int(3)));
- BOOST_HOF_TEST_CHECK(x != y);
- BOOST_HOF_TEST_CHECK(tuple_transform(x, *boost::hof::_1) == tuple_transform(y, *boost::hof::_1));
- }
- #define TUPLE_TRANSFORM_CHECK_COMPOSE(x, f, g) \
- BOOST_HOF_TEST_CHECK(tuple_transform(x, boost::hof::compose(f, g)) == tuple_transform(tuple_transform(x, g), f)); \
- TUPLE_TRANSFORM_STATIC_CHECK(tuple_transform(x, boost::hof::compose(f, g)) == tuple_transform(tuple_transform(x, g), f));
- BOOST_HOF_TEST_CASE()
- {
- TUPLE_TRANSFORM_CHECK_COMPOSE(std::make_tuple(1, 2, 3, 4), boost::hof::_1 * boost::hof::_1, boost::hof::_1 + boost::hof::_1);
- TUPLE_TRANSFORM_CHECK_COMPOSE(std::make_tuple(1, 2, 3), boost::hof::_1 * boost::hof::_1, boost::hof::_1 + boost::hof::_1);
- TUPLE_TRANSFORM_CHECK_COMPOSE(std::make_tuple(1), boost::hof::_1 * boost::hof::_1, boost::hof::_1 + boost::hof::_1);
- TUPLE_TRANSFORM_CHECK_COMPOSE(std::make_tuple(), boost::hof::_1 * boost::hof::_1, boost::hof::_1 + boost::hof::_1);
- }
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