91 lines
3.4 KiB
C++
91 lines
3.4 KiB
C++
/*=============================================================================
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Copyright (c) 2017 Paul Fultz II
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tuple_transform.cpp
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#include <boost/hof/proj.hpp>
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#include <boost/hof/construct.hpp>
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#include <boost/hof/unpack.hpp>
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#include <boost/hof/function.hpp>
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#include <boost/hof/placeholders.hpp>
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#include <boost/hof/compose.hpp>
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// Disable static checks for gcc 4.7
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#ifndef BOOST_HOF_HAS_STATIC_TEST_CHECK
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#if (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 8)
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#define BOOST_HOF_HAS_STATIC_TEST_CHECK 0
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#endif
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#endif
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#include "test.hpp"
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struct tuple_transform_f
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{
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template<class Sequence, class F>
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constexpr auto operator()(Sequence&& s, F f) const BOOST_HOF_RETURNS
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(
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boost::hof::unpack(boost::hof::proj(f, boost::hof::construct<std::tuple>()))(boost::hof::forward<Sequence>(s))
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);
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};
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struct pack_transform_f
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{
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template<class Sequence, class F>
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constexpr auto operator()(Sequence&& s, F f) const BOOST_HOF_RETURNS
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(
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boost::hof::unpack(boost::hof::proj(f, boost::hof::pack()))(boost::hof::forward<Sequence>(s))
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);
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};
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BOOST_HOF_STATIC_FUNCTION(tuple_transform) = tuple_transform_f{};
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// BOOST_HOF_STATIC_FUNCTION(pack_transform) = pack_transform_f{};
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#if !BOOST_HOF_HAS_CONSTEXPR_TUPLE
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#define TUPLE_TRANSFORM_STATIC_CHECK(...)
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#else
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#define TUPLE_TRANSFORM_STATIC_CHECK BOOST_HOF_STATIC_TEST_CHECK
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#endif
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BOOST_HOF_TEST_CASE()
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{
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auto t = std::make_tuple(1, 2);
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auto r = tuple_transform(t, [](int i) { return i*i; });
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BOOST_HOF_TEST_CHECK(r == std::make_tuple(1, 4));
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}
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BOOST_HOF_TEST_CASE()
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{
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TUPLE_TRANSFORM_STATIC_CHECK(tuple_transform(std::make_tuple(1, 2), boost::hof::_1 * boost::hof::_1) == std::make_tuple(1, 4));
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}
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#define TUPLE_TRANSFORM_CHECK_ID(x) \
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BOOST_HOF_TEST_CHECK(tuple_transform(x, boost::hof::identity) == x); \
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TUPLE_TRANSFORM_STATIC_CHECK(tuple_transform(x, boost::hof::identity) == x);
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BOOST_HOF_TEST_CASE()
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{
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TUPLE_TRANSFORM_CHECK_ID(std::make_tuple(1, 2));
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TUPLE_TRANSFORM_CHECK_ID(std::make_tuple(1));
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TUPLE_TRANSFORM_CHECK_ID(std::make_tuple());
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}
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BOOST_HOF_TEST_CASE()
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{
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auto x = tuple_transform(std::make_tuple(std::unique_ptr<int>(new int(3))), boost::hof::identity);
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auto y = std::make_tuple(std::unique_ptr<int>(new int(3)));
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BOOST_HOF_TEST_CHECK(x != y);
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BOOST_HOF_TEST_CHECK(tuple_transform(x, *boost::hof::_1) == tuple_transform(y, *boost::hof::_1));
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}
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#define TUPLE_TRANSFORM_CHECK_COMPOSE(x, f, g) \
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BOOST_HOF_TEST_CHECK(tuple_transform(x, boost::hof::compose(f, g)) == tuple_transform(tuple_transform(x, g), f)); \
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TUPLE_TRANSFORM_STATIC_CHECK(tuple_transform(x, boost::hof::compose(f, g)) == tuple_transform(tuple_transform(x, g), f));
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BOOST_HOF_TEST_CASE()
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{
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TUPLE_TRANSFORM_CHECK_COMPOSE(std::make_tuple(1, 2, 3, 4), boost::hof::_1 * boost::hof::_1, boost::hof::_1 + boost::hof::_1);
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TUPLE_TRANSFORM_CHECK_COMPOSE(std::make_tuple(1, 2, 3), boost::hof::_1 * boost::hof::_1, boost::hof::_1 + boost::hof::_1);
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TUPLE_TRANSFORM_CHECK_COMPOSE(std::make_tuple(1), boost::hof::_1 * boost::hof::_1, boost::hof::_1 + boost::hof::_1);
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TUPLE_TRANSFORM_CHECK_COMPOSE(std::make_tuple(), boost::hof::_1 * boost::hof::_1, boost::hof::_1 + boost::hof::_1);
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}
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