mirror of
https://github.com/boostorg/hana.git
synced 2026-01-31 20:22:10 +00:00
521 lines
10 KiB
C++
521 lines
10 KiB
C++
/*
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@copyright Louis Dionne 2014
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#include <boost/hana/assert.hpp>
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#include <boost/hana/detail/constexpr.hpp>
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#include <boost/hana/ext/std/integral_constant.hpp>
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#include <boost/hana/ext/std/tuple.hpp>
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#include <boost/hana/functional.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include <boost/hana/maybe.hpp>
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#include <boost/hana/pair.hpp>
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#include <boost/hana/tuple.hpp>
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#include <boost/hana/type.hpp>
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#include <sstream>
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#include <string>
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#include <type_traits>
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using namespace boost::hana;
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int main() {
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{
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//! [comparable]
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BOOST_HANA_CONSTEXPR_CHECK(tuple(1, 2, 3) == tuple(1, 2, 3));
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BOOST_HANA_CONSTEXPR_CHECK(tuple(1, 2, 3) != tuple(1, 2, 3, 4));
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//! [comparable]
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}{
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//! [orderable]
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BOOST_HANA_CONSTEXPR_CHECK(tuple(1, 2, 3) < tuple(2, 3, 4));
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BOOST_HANA_CONSTEXPR_CHECK(tuple(1, 2, 3) < tuple(1, 2, 3, 4));
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//! [orderable]
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}{
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//! [foldable]
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auto to_string = [](auto x) {
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return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
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};
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auto show = [=](auto x, auto y) {
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return "(" + to_string(x) + " + " + to_string(y) + ")";
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};
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BOOST_HANA_RUNTIME_CHECK(foldl(tuple(2, "3", '4'), "1", show) == "(((1 + 2) + 3) + 4)");
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//! [foldable]
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}{
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//! [iterable]
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BOOST_HANA_CONSTEXPR_CHECK(head(tuple(1, '2', 3.3)) == 1);
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BOOST_HANA_CONSTEXPR_CHECK(tail(tuple(1, '2', 3.3)) == tuple('2', 3.3));
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BOOST_HANA_CONSTANT_CHECK(!is_empty(tuple(1, '2', 3.3)));
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BOOST_HANA_CONSTANT_CHECK(is_empty(tuple()));
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//! [iterable]
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}{
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//! [functor]
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auto to_string = [](auto x) {
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return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
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};
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BOOST_HANA_RUNTIME_CHECK(
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fmap(tuple(1, '2', "345", std::string{"67"}), to_string) ==
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tuple("1", "2", "345", "67")
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);
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//! [functor]
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}{
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//! [applicative]
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BOOST_HANA_CONSTEXPR_CHECK(lift<Tuple>('x') == tuple('x'));
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BOOST_HANA_CONSTEXPR_CHECK(equal(lift<ext::std::Tuple>('x'), std::make_tuple('x')));
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BOOST_HANA_CONSTEXPR_LAMBDA auto f = pair;
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BOOST_HANA_CONSTEXPR_LAMBDA auto g = flip(pair);
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BOOST_HANA_CONSTEXPR_CHECK(
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ap(tuple(f, g), tuple(1, 2, 3), tuple('a', 'b'))
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==
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tuple(
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f(1, 'a'), f(1, 'b'), f(2, 'a'), f(2, 'b'), f(3, 'a'), f(3, 'b'),
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g(1, 'a'), g(1, 'b'), g(2, 'a'), g(2, 'b'), g(3, 'a'), g(3, 'b')
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)
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);
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//! [applicative]
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}{
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//! [monad]
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BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto x) {
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return tuple(x, -x);
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};
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BOOST_HANA_CONSTEXPR_CHECK((tuple(1, 2, 3) | f) == tuple(1, -1, 2, -2, 3, -3));
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BOOST_HANA_CONSTEXPR_CHECK(
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flatten(tuple(tuple(1, 2), tuple(3, 4), tuple(tuple(5, 6))))
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==
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tuple(1, 2, 3, 4, tuple(5, 6))
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);
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//! [monad]
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}{
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//! [traversable]
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using namespace std::string_literals;
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BOOST_HANA_RUNTIME_CHECK(
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sequence<Tuple>(
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tuple(tuple("a1"s, "a2"s), tuple("b1"s), tuple("c1"s, "c2"s, "c3"s))
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)
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==
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tuple(
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tuple("a1"s, "b1"s, "c1"s),
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tuple("a1"s, "b1"s, "c2"s),
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tuple("a1"s, "b1"s, "c3"s),
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tuple("a2"s, "b1"s, "c1"s),
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tuple("a2"s, "b1"s, "c2"s),
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tuple("a2"s, "b1"s, "c3"s)
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)
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);
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BOOST_HANA_CONSTEXPR_LAMBDA auto half = [](auto x) {
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return if_(x % int_<2> == int_<0>,
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just(x / int_<2>),
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nothing
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);
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};
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BOOST_HANA_CONSTANT_CHECK(
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traverse<Maybe>(tuple(int_<2>, int_<4>, int_<6>), half)
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==
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just(tuple(int_<1>, int_<2>, int_<3>))
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);
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BOOST_HANA_CONSTANT_CHECK(
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traverse<Maybe>(tuple(int_<2>, int_<3>, int_<6>), half)
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==
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nothing
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);
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//! [traversable]
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}{
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//! [make]
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BOOST_HANA_CONSTANT_CHECK(make<Tuple>() == tuple());
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BOOST_HANA_CONSTEXPR_CHECK(make<Tuple>(1, '2', 3.3) == tuple(1, '2', 3.3));
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//! [make]
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}{
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//! [init]
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using namespace literals;
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BOOST_HANA_CONSTANT_CHECK(init(tuple(1)) == tuple());
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BOOST_HANA_CONSTEXPR_CHECK(init(tuple(1, '2', 3.3, 4_c)) == tuple(1, '2', 3.3));
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//! [init]
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}{
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//! [intersperse]
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BOOST_HANA_CONSTEXPR_CHECK(
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intersperse(tuple(1, '2', 3.3), 'x') == tuple(1, 'x', '2', 'x', 3.3)
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);
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BOOST_HANA_CONSTANT_CHECK(intersperse(tuple(), 'x') == tuple());
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//! [intersperse]
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}{
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//! [remove_at]
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BOOST_HANA_CONSTEXPR_CHECK(
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remove_at(int_<2>, tuple(0, '1', 2.2, 3u)) == tuple(0, '1', 3u)
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);
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//! [remove_at]
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}{
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//! [remove_at_c]
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BOOST_HANA_CONSTEXPR_CHECK(
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remove_at_c<2>(tuple(0, '1', 2.2, 3u)) == tuple(0, '1', 3u)
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);
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//! [remove_at_c]
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}{
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//! [reverse]
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BOOST_HANA_CONSTEXPR_CHECK(reverse(tuple(1, '2', 3.3)) == tuple(3.3, '2', 1));
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//! [reverse]
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}{
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//! [group_by]
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BOOST_HANA_CONSTEXPR_CHECK(
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group_by(equal ^on^ decltype_,
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tuple(1, 2, 3, 'x', 'y', 4.4, 5.5)
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)
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== tuple(
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tuple(1, 2, 3),
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tuple('x', 'y'),
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tuple(4.4, 5.5)
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)
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);
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//! [group_by]
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}{
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//! [group]
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BOOST_HANA_CONSTANT_CHECK(
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group(tuple(int_<1>, long_<1>, type<int>, char_<'x'>, char_<'x'>))
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==
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tuple(
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tuple(int_<1>, long_<1>),
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tuple(type<int>),
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tuple(char_<'x'>, char_<'x'>)
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)
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);
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//! [group]
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}{
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//! [zip]
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BOOST_HANA_CONSTEXPR_CHECK(
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zip(tuple(1, 'a'), tuple(2, 3.3))
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==
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tuple(tuple(1, 2), tuple('a', 3.3))
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);
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BOOST_HANA_CONSTEXPR_CHECK(
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zip(tuple(1, 'a'), tuple(2, 3.3), tuple(3, 'c', "ignored"))
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==
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tuple(tuple(1, 2, 3), tuple('a', 3.3, 'c'))
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);
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//! [zip]
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}{
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//! [zip_with]
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BOOST_HANA_CONSTEXPR_CHECK(
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zip_with(_ * _, tuple(1, 2, 3, 4), tuple(5, 6, 7, 8, "ignored"))
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==
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tuple(5, 12, 21, 32)
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);
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//! [zip_with]
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}{
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//! [unzip]
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BOOST_HANA_CONSTEXPR_CHECK(
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unzip(tuple(tuple(1, '2', 3.3), tuple('4', 5.5, 6)))
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==
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tuple(tuple(1, '4'), tuple('2', 5.5), tuple(3.3, 6))
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);
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BOOST_HANA_CONSTEXPR_CHECK(
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unzip(tuple(tuple(1, '2', 3.3), tuple('4', 5.5, 6, "ignored")))
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==
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tuple(tuple(1, '4'), tuple('2', 5.5), tuple(3.3, 6))
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);
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//! [unzip]
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}{
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//! [take_while]
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using namespace literals;
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BOOST_HANA_CONSTANT_CHECK(
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take_while(tuple_c<int, 0, 1, 2, 3>, _ < 2_c)
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==
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tuple_c<int, 0, 1>
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);
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//! [take_while]
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}{
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//! [take_until]
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using namespace literals;
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BOOST_HANA_CONSTANT_CHECK(
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take_until(tuple_c<int, 3, 2, 1, 0>, _ < 2_c)
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==
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tuple_c<int, 3, 2>
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);
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//! [take_until]
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}{
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//! [take]
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using namespace literals;
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BOOST_HANA_CONSTANT_CHECK(take(0_c, tuple(1, '2', 3.3)) == tuple());
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BOOST_HANA_CONSTEXPR_CHECK(take(1_c, tuple(1, '2', 3.3)) == tuple(1));
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BOOST_HANA_CONSTEXPR_CHECK(take(2_c, tuple(1, '2', 3.3)) == tuple(1, '2'));
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BOOST_HANA_CONSTEXPR_CHECK(take(3_c, tuple(1, '2', 3.3)) == tuple(1, '2', 3.3));
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BOOST_HANA_CONSTEXPR_CHECK(take(4_c, tuple(1, '2', 3.3)) == tuple(1, '2', 3.3));
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//! [take]
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}{
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//! [take_c]
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BOOST_HANA_CONSTEXPR_CHECK(take_c<2>(tuple(1, '2', 3.3)) == tuple(1, '2'));
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//! [take_c]
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}{
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//! [span]
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BOOST_HANA_CONSTEXPR_LAMBDA auto xs = tuple(int_<1>, int_<2>, int_<3>, int_<4>);
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BOOST_HANA_CONSTANT_CHECK(
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span(xs, _ < int_<3>)
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==
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pair(tuple(int_<1>, int_<2>), tuple(int_<3>, int_<4>))
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);
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BOOST_HANA_CONSTANT_CHECK(
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span(xs, _ < int_<0>)
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==
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pair(tuple(), xs)
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);
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BOOST_HANA_CONSTANT_CHECK(
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span(xs, _ < int_<5>)
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==
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pair(xs, tuple())
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);
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//! [span]
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}{
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//! [sort]
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using namespace literals;
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BOOST_HANA_CONSTANT_CHECK(
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sort(tuple(1_c, -2_c, 3_c, 0_c)) == tuple(-2_c, 0_c, 1_c, 3_c)
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);
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//! [sort]
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}{
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//! [sort_by]
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using namespace literals;
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BOOST_HANA_CONSTANT_CHECK(
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sort_by(_>_, tuple(1_c, -2_c, 3_c, 0_c))
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==
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tuple(3_c, 1_c, 0_c, -2_c)
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);
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//! [sort_by]
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}{
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//! [slice]
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BOOST_HANA_CONSTEXPR_CHECK(
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slice(tuple(1, '2', 3.3, type<float>), int_<1>, int_<3>)
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==
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tuple('2', 3.3)
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);
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//! [slice]
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}{
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//! [slice_c]
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BOOST_HANA_CONSTEXPR_CHECK(
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slice_c<1, 3>(tuple(1, '2', 3.3, type<float>))
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==
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tuple('2', 3.3)
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);
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//! [slice_c]
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}{
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//! [permutations]
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BOOST_HANA_CONSTEXPR_LAMBDA auto is_permutation_of = curry<2>([](auto xs, auto perm) {
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return elem(permutations(xs), perm);
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});
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BOOST_HANA_CONSTEXPR_CHECK(
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all(
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tuple(
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tuple('1', 2, 3.0),
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tuple('1', 3.0, 2),
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tuple(2, '1', 3.0),
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tuple(2, 3.0, '1'),
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tuple(3.0, '1', 2),
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tuple(3.0, 2, '1')
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),
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is_permutation_of(tuple('1', 2, 3.0))
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)
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);
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//! [permutations]
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}{
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//! [unfoldl]
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BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto x) {
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return if_(x == int_<0>, nothing, just(pair(x - int_<1>, x)));
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};
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BOOST_HANA_CONSTANT_CHECK(
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unfoldl<Tuple>(f, int_<10>)
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==
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tuple_c<int, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10>
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);
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//! [unfoldl]
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}{
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//! [unfoldr]
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BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto x) {
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return if_(x == int_<0>, nothing, just(pair(x, x - int_<1>)));
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};
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BOOST_HANA_CONSTANT_CHECK(
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unfoldr<Tuple>(f, int_<10>)
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==
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tuple_c<int, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1>
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);
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//! [unfoldr]
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}{
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//! [scanl]
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auto to_string = [](auto x) {
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return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
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};
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auto show = [=](auto x, auto y) {
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return "(" + to_string(x) + " + " + to_string(y) + ")";
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};
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BOOST_HANA_RUNTIME_CHECK(scanl(tuple(2, "3", '4'), 1, show) == tuple(
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1,
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"(1 + 2)",
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"((1 + 2) + 3)",
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"(((1 + 2) + 3) + 4)"
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));
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//! [scanl]
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}{
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//! [scanl1]
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auto to_string = [](auto x) {
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return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
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};
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auto show = [=](auto x, auto y) {
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return "(" + to_string(x) + " + " + to_string(y) + ")";
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};
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BOOST_HANA_RUNTIME_CHECK(scanl1(tuple(1, "2", '3'), show) == tuple(
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1,
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"(1 + 2)",
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"((1 + 2) + 3)"
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));
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//! [scanl1]
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}{
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//! [scanr]
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auto to_string = [](auto x) {
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return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
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};
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auto show = [=](auto x, auto y) {
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return "(" + to_string(x) + " + " + to_string(y) + ")";
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};
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BOOST_HANA_RUNTIME_CHECK(scanr(tuple(1, "2", '3'), 4, show) == tuple(
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"(1 + (2 + (3 + 4)))",
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"(2 + (3 + 4))",
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"(3 + 4)",
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4
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));
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//! [scanr]
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}{
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//! [scanr1]
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auto to_string = [](auto x) {
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return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
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};
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auto show = [=](auto x, auto y) {
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return "(" + to_string(x) + " + " + to_string(y) + ")";
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};
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BOOST_HANA_RUNTIME_CHECK(scanr1(tuple(1, "2", '3'), show) == tuple(
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"(1 + (2 + 3))",
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"(2 + 3)",
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'3'
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));
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//! [scanr1]
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}{
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//! [partition]
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BOOST_HANA_CONSTANT_CHECK(
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partition(tuple_c<int, 1, 2, 3, 4, 5, 6, 7>, [](auto x) {
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return x % int_<2> != int_<0>;
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})
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==
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pair(
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tuple_c<int, 1, 3, 5, 7>,
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tuple_c<int, 2, 4, 6>
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)
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);
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BOOST_HANA_CONSTANT_CHECK(
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partition(tuple_t<void, int, float, char, double>, trait<std::is_floating_point>)
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==
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pair(
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tuple_t<float, double>,
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tuple_t<void, int, char>
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)
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);
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//! [partition]
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}
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}
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