mirror of
https://github.com/boostorg/hana.git
synced 2026-02-01 20:42:13 +00:00
553 lines
12 KiB
C++
553 lines
12 KiB
C++
/*
|
|
@copyright Louis Dionne 2015
|
|
Distributed under the Boost Software License, Version 1.0.
|
|
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
|
|
*/
|
|
|
|
#include <boost/hana/assert.hpp>
|
|
#include <boost/hana/config.hpp>
|
|
#include <boost/hana/ext/std/integral_constant.hpp>
|
|
#include <boost/hana/ext/std/tuple.hpp>
|
|
#include <boost/hana/functional.hpp>
|
|
#include <boost/hana/integral_constant.hpp>
|
|
#include <boost/hana/maybe.hpp>
|
|
#include <boost/hana/pair.hpp>
|
|
#include <boost/hana/tuple.hpp>
|
|
#include <boost/hana/type.hpp>
|
|
|
|
#include <sstream>
|
|
#include <string>
|
|
#include <type_traits>
|
|
using namespace boost::hana;
|
|
|
|
|
|
int main() {
|
|
|
|
{
|
|
|
|
//! [comparable]
|
|
BOOST_HANA_CONSTEXPR_CHECK(make<Tuple>(1, 2, 3) == make<Tuple>(1, 2, 3));
|
|
BOOST_HANA_CONSTEXPR_CHECK(make<Tuple>(1, 2, 3) != make<Tuple>(1, 2, 3, 4));
|
|
//! [comparable]
|
|
|
|
}{
|
|
|
|
//! [orderable]
|
|
BOOST_HANA_CONSTEXPR_CHECK(make<Tuple>(1, 2, 3) < make<Tuple>(2, 3, 4));
|
|
BOOST_HANA_CONSTEXPR_CHECK(make<Tuple>(1, 2, 3) < make<Tuple>(1, 2, 3, 4));
|
|
//! [orderable]
|
|
|
|
}{
|
|
|
|
//! [foldable]
|
|
auto to_string = [](auto x) {
|
|
return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
|
|
};
|
|
|
|
auto show = [=](auto x, auto y) {
|
|
return "(" + to_string(x) + " + " + to_string(y) + ")";
|
|
};
|
|
|
|
BOOST_HANA_RUNTIME_CHECK(foldl(make<Tuple>(2, "3", '4'), "1", show) == "(((1 + 2) + 3) + 4)");
|
|
//! [foldable]
|
|
|
|
}{
|
|
|
|
//! [iterable]
|
|
BOOST_HANA_CONSTEXPR_CHECK(head(make<Tuple>(1, '2', 3.3)) == 1);
|
|
BOOST_HANA_CONSTEXPR_CHECK(tail(make<Tuple>(1, '2', 3.3)) == make<Tuple>('2', 3.3));
|
|
BOOST_HANA_CONSTANT_CHECK(!is_empty(make<Tuple>(1, '2', 3.3)));
|
|
BOOST_HANA_CONSTANT_CHECK(is_empty(make<Tuple>()));
|
|
//! [iterable]
|
|
|
|
}{
|
|
|
|
//! [searchable]
|
|
using namespace std::string_literals;
|
|
|
|
BOOST_HANA_RUNTIME_CHECK(
|
|
find_if(make<Tuple>(1, '2', 3.3, "abc"s), is_a<std::string>) == just("abc"s)
|
|
);
|
|
|
|
BOOST_HANA_RUNTIME_CHECK(
|
|
"abc"s ^in^ make<Tuple>(1, '2', 3.3, "abc"s)
|
|
);
|
|
//! [searchable]
|
|
|
|
}{
|
|
|
|
//! [functor]
|
|
auto to_string = [](auto x) {
|
|
return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
|
|
};
|
|
|
|
BOOST_HANA_RUNTIME_CHECK(
|
|
transform(make<Tuple>(1, '2', "345", std::string{"67"}), to_string) ==
|
|
make<Tuple>("1", "2", "345", "67")
|
|
);
|
|
//! [functor]
|
|
|
|
}{
|
|
|
|
//! [applicative]
|
|
BOOST_HANA_CONSTEXPR_CHECK(lift<Tuple>('x') == make<Tuple>('x'));
|
|
BOOST_HANA_CONSTEXPR_CHECK(equal(lift<ext::std::Tuple>('x'), std::make_tuple('x')));
|
|
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto f = pair;
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto g = flip(pair);
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
ap(make<Tuple>(f, g), make<Tuple>(1, 2, 3), make<Tuple>('a', 'b'))
|
|
==
|
|
make<Tuple>(
|
|
f(1, 'a'), f(1, 'b'), f(2, 'a'), f(2, 'b'), f(3, 'a'), f(3, 'b'),
|
|
g(1, 'a'), g(1, 'b'), g(2, 'a'), g(2, 'b'), g(3, 'a'), g(3, 'b')
|
|
)
|
|
);
|
|
//! [applicative]
|
|
|
|
}{
|
|
|
|
//! [monad]
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto x) {
|
|
return make<Tuple>(x, -x);
|
|
};
|
|
|
|
BOOST_HANA_CONSTEXPR_CHECK((make<Tuple>(1, 2, 3) | f) == make<Tuple>(1, -1, 2, -2, 3, -3));
|
|
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
flatten(make<Tuple>(make<Tuple>(1, 2), make<Tuple>(3, 4), make<Tuple>(make<Tuple>(5, 6))))
|
|
==
|
|
make<Tuple>(1, 2, 3, 4, make<Tuple>(5, 6))
|
|
);
|
|
//! [monad]
|
|
|
|
}{
|
|
|
|
//! [monad_plus]
|
|
using namespace std::string_literals;
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(empty<Tuple>() == make<Tuple>());
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
append(make<Tuple>(1, '2', 3.3), nullptr) == make<Tuple>(1, '2', 3.3, nullptr)
|
|
);
|
|
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
concat(make<Tuple>(1, '2', 3.3), make<Tuple>("abcdef"s)) ==
|
|
make<Tuple>(1, '2', 3.3, "abcdef"s)
|
|
);
|
|
//! [monad_plus]
|
|
|
|
}{
|
|
|
|
//! [traversable]
|
|
using namespace std::string_literals;
|
|
|
|
BOOST_HANA_RUNTIME_CHECK(
|
|
sequence<Tuple>(
|
|
make<Tuple>(make<Tuple>("a1"s, "a2"s),
|
|
make<Tuple>("b1"s),
|
|
make<Tuple>("c1"s, "c2"s, "c3"s))
|
|
)
|
|
==
|
|
make<Tuple>(
|
|
make<Tuple>("a1"s, "b1"s, "c1"s),
|
|
make<Tuple>("a1"s, "b1"s, "c2"s),
|
|
make<Tuple>("a1"s, "b1"s, "c3"s),
|
|
|
|
make<Tuple>("a2"s, "b1"s, "c1"s),
|
|
make<Tuple>("a2"s, "b1"s, "c2"s),
|
|
make<Tuple>("a2"s, "b1"s, "c3"s)
|
|
)
|
|
);
|
|
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto half = [](auto x) {
|
|
return if_(x % int_<2> == int_<0>,
|
|
just(x / int_<2>),
|
|
nothing
|
|
);
|
|
};
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
traverse<Maybe>(make<Tuple>(int_<2>, int_<4>, int_<6>), half)
|
|
==
|
|
just(make<Tuple>(int_<1>, int_<2>, int_<3>))
|
|
);
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
traverse<Maybe>(make<Tuple>(int_<2>, int_<3>, int_<6>), half)
|
|
==
|
|
nothing
|
|
);
|
|
//! [traversable]
|
|
|
|
}{
|
|
|
|
//! [make]
|
|
BOOST_HANA_CONSTANT_CHECK(make<Tuple>() == make<Tuple>());
|
|
BOOST_HANA_CONSTEXPR_CHECK(make<Tuple>(1, '2', 3.3) == make<Tuple>(1, '2', 3.3));
|
|
//! [make]
|
|
|
|
}{
|
|
|
|
//! [init]
|
|
using namespace literals;
|
|
BOOST_HANA_CONSTANT_CHECK(init(make<Tuple>(1)) == make<Tuple>());
|
|
BOOST_HANA_CONSTEXPR_CHECK(init(make<Tuple>(1, '2', 3.3, 4_c)) == make<Tuple>(1, '2', 3.3));
|
|
//! [init]
|
|
|
|
}{
|
|
|
|
//! [intersperse]
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
intersperse(make<Tuple>(1, '2', 3.3), 'x') == make<Tuple>(1, 'x', '2', 'x', 3.3)
|
|
);
|
|
BOOST_HANA_CONSTANT_CHECK(intersperse(make<Tuple>(), 'x') == make<Tuple>());
|
|
//! [intersperse]
|
|
|
|
}{
|
|
|
|
//! [remove_at]
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
remove_at(int_<2>, make<Tuple>(0, '1', 2.2, 3u)) == make<Tuple>(0, '1', 3u)
|
|
);
|
|
//! [remove_at]
|
|
|
|
}{
|
|
|
|
//! [remove_at_c]
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
remove_at_c<2>(make<Tuple>(0, '1', 2.2, 3u)) == make<Tuple>(0, '1', 3u)
|
|
);
|
|
//! [remove_at_c]
|
|
|
|
}{
|
|
|
|
//! [reverse]
|
|
BOOST_HANA_CONSTEXPR_CHECK(reverse(make<Tuple>(1, '2', 3.3)) == make<Tuple>(3.3, '2', 1));
|
|
//! [reverse]
|
|
|
|
}{
|
|
|
|
//! [group_by]
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
group_by(equal ^on^ decltype_,
|
|
make<Tuple>(1, 2, 3, 'x', 'y', 4.4, 5.5)
|
|
)
|
|
== make<Tuple>(
|
|
make<Tuple>(1, 2, 3),
|
|
make<Tuple>('x', 'y'),
|
|
make<Tuple>(4.4, 5.5)
|
|
)
|
|
);
|
|
//! [group_by]
|
|
|
|
}{
|
|
|
|
//! [group]
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
group(make<Tuple>(int_<1>, long_<1>, type<int>, char_<'x'>, char_<'x'>))
|
|
==
|
|
make<Tuple>(
|
|
make<Tuple>(int_<1>, long_<1>),
|
|
make<Tuple>(type<int>),
|
|
make<Tuple>(char_<'x'>, char_<'x'>)
|
|
)
|
|
);
|
|
//! [group]
|
|
|
|
}{
|
|
|
|
//! [zip]
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
zip(make<Tuple>(1, 'a'), make<Tuple>(2, 3.3))
|
|
==
|
|
make<Tuple>(make<Tuple>(1, 2), make<Tuple>('a', 3.3))
|
|
);
|
|
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
zip(make<Tuple>(1, 'a'), make<Tuple>(2, 3.3), make<Tuple>(3, 'c', "ignored"))
|
|
==
|
|
make<Tuple>(make<Tuple>(1, 2, 3), make<Tuple>('a', 3.3, 'c'))
|
|
);
|
|
//! [zip]
|
|
|
|
}{
|
|
|
|
//! [zip_with]
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
zip.with(_ * _, make<Tuple>(1, 2, 3, 4), make<Tuple>(5, 6, 7, 8, "ignored"))
|
|
==
|
|
make<Tuple>(5, 12, 21, 32)
|
|
);
|
|
//! [zip_with]
|
|
|
|
}{
|
|
|
|
//! [unzip]
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
unzip(make<Tuple>(make<Tuple>(1, '2', 3.3), make<Tuple>('4', 5.5, 6)))
|
|
==
|
|
make<Tuple>(make<Tuple>(1, '4'), make<Tuple>('2', 5.5), make<Tuple>(3.3, 6))
|
|
);
|
|
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
unzip(make<Tuple>(make<Tuple>(1, '2', 3.3), make<Tuple>('4', 5.5, 6, "ignored")))
|
|
==
|
|
make<Tuple>(make<Tuple>(1, '4'), make<Tuple>('2', 5.5), make<Tuple>(3.3, 6))
|
|
);
|
|
//! [unzip]
|
|
|
|
}{
|
|
|
|
//! [take_while]
|
|
using namespace literals;
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
take_while(tuple_c<int, 0, 1, 2, 3>, _ < 2_c)
|
|
==
|
|
tuple_c<int, 0, 1>
|
|
);
|
|
//! [take_while]
|
|
|
|
}{
|
|
|
|
//! [take_until]
|
|
using namespace literals;
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
take_until(tuple_c<int, 3, 2, 1, 0>, _ < 2_c)
|
|
==
|
|
tuple_c<int, 3, 2>
|
|
);
|
|
//! [take_until]
|
|
|
|
}{
|
|
|
|
//! [take]
|
|
using namespace literals;
|
|
BOOST_HANA_CONSTANT_CHECK(take(0_c, make<Tuple>(1, '2', 3.3)) == make<Tuple>());
|
|
BOOST_HANA_CONSTEXPR_CHECK(take(1_c, make<Tuple>(1, '2', 3.3)) == make<Tuple>(1));
|
|
BOOST_HANA_CONSTEXPR_CHECK(take(2_c, make<Tuple>(1, '2', 3.3)) == make<Tuple>(1, '2'));
|
|
BOOST_HANA_CONSTEXPR_CHECK(take(3_c, make<Tuple>(1, '2', 3.3)) == make<Tuple>(1, '2', 3.3));
|
|
BOOST_HANA_CONSTEXPR_CHECK(take(4_c, make<Tuple>(1, '2', 3.3)) == make<Tuple>(1, '2', 3.3));
|
|
//! [take]
|
|
|
|
}{
|
|
|
|
//! [take_c]
|
|
BOOST_HANA_CONSTEXPR_CHECK(take_c<2>(make<Tuple>(1, '2', 3.3)) == make<Tuple>(1, '2'));
|
|
//! [take_c]
|
|
|
|
}{
|
|
|
|
//! [span]
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto xs = make<Tuple>(int_<1>, int_<2>, int_<3>, int_<4>);
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
span(xs, _ < int_<3>)
|
|
==
|
|
pair(make<Tuple>(int_<1>, int_<2>), make<Tuple>(int_<3>, int_<4>))
|
|
);
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
span(xs, _ < int_<0>)
|
|
==
|
|
pair(make<Tuple>(), xs)
|
|
);
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
span(xs, _ < int_<5>)
|
|
==
|
|
pair(xs, make<Tuple>())
|
|
);
|
|
//! [span]
|
|
|
|
}{
|
|
|
|
//! [sort]
|
|
using namespace literals;
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
sort(make<Tuple>(1_c, -2_c, 3_c, 0_c)) == make<Tuple>(-2_c, 0_c, 1_c, 3_c)
|
|
);
|
|
//! [sort]
|
|
|
|
}{
|
|
|
|
//! [sort_by]
|
|
using namespace literals;
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
sort_by(_>_, make<Tuple>(1_c, -2_c, 3_c, 0_c))
|
|
==
|
|
make<Tuple>(3_c, 1_c, 0_c, -2_c)
|
|
);
|
|
//! [sort_by]
|
|
|
|
}{
|
|
|
|
//! [slice]
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
slice(make<Tuple>(1, '2', 3.3, type<float>), int_<1>, int_<3>)
|
|
==
|
|
make<Tuple>('2', 3.3)
|
|
);
|
|
//! [slice]
|
|
|
|
}{
|
|
|
|
//! [slice_c]
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
slice_c<1, 3>(make<Tuple>(1, '2', 3.3, type<float>))
|
|
==
|
|
make<Tuple>('2', 3.3)
|
|
);
|
|
//! [slice_c]
|
|
|
|
}{
|
|
|
|
//! [permutations]
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto is_permutation_of = curry<2>([](auto xs, auto perm) {
|
|
return elem(permutations(xs), perm);
|
|
});
|
|
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
all_of(
|
|
make<Tuple>(
|
|
make<Tuple>('1', 2, 3.0),
|
|
make<Tuple>('1', 3.0, 2),
|
|
make<Tuple>(2, '1', 3.0),
|
|
make<Tuple>(2, 3.0, '1'),
|
|
make<Tuple>(3.0, '1', 2),
|
|
make<Tuple>(3.0, 2, '1')
|
|
),
|
|
is_permutation_of(make<Tuple>('1', 2, 3.0))
|
|
)
|
|
);
|
|
//! [permutations]
|
|
|
|
}{
|
|
|
|
//! [unfoldl]
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto x) {
|
|
return if_(x == int_<0>, nothing, just(pair(x - int_<1>, x)));
|
|
};
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
unfoldl<Tuple>(f, int_<10>)
|
|
==
|
|
tuple_c<int, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10>
|
|
);
|
|
//! [unfoldl]
|
|
|
|
}{
|
|
|
|
//! [unfoldr]
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto x) {
|
|
return if_(x == int_<0>, nothing, just(pair(x, x - int_<1>)));
|
|
};
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
unfoldr<Tuple>(f, int_<10>)
|
|
==
|
|
tuple_c<int, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1>
|
|
);
|
|
//! [unfoldr]
|
|
|
|
}{
|
|
|
|
//! [scanl]
|
|
auto to_string = [](auto x) {
|
|
return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
|
|
};
|
|
|
|
auto show = [=](auto x, auto y) {
|
|
return "(" + to_string(x) + " + " + to_string(y) + ")";
|
|
};
|
|
|
|
BOOST_HANA_RUNTIME_CHECK(scanl(make<Tuple>(2, "3", '4'), 1, show) == make<Tuple>(
|
|
1,
|
|
"(1 + 2)",
|
|
"((1 + 2) + 3)",
|
|
"(((1 + 2) + 3) + 4)"
|
|
));
|
|
//! [scanl]
|
|
|
|
}{
|
|
|
|
//! [scanl1]
|
|
auto to_string = [](auto x) {
|
|
return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
|
|
};
|
|
|
|
auto show = [=](auto x, auto y) {
|
|
return "(" + to_string(x) + " + " + to_string(y) + ")";
|
|
};
|
|
|
|
BOOST_HANA_RUNTIME_CHECK(scanl1(make<Tuple>(1, "2", '3'), show) == make<Tuple>(
|
|
1,
|
|
"(1 + 2)",
|
|
"((1 + 2) + 3)"
|
|
));
|
|
//! [scanl1]
|
|
|
|
}{
|
|
|
|
//! [scanr]
|
|
auto to_string = [](auto x) {
|
|
return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
|
|
};
|
|
|
|
auto show = [=](auto x, auto y) {
|
|
return "(" + to_string(x) + " + " + to_string(y) + ")";
|
|
};
|
|
|
|
BOOST_HANA_RUNTIME_CHECK(scanr(make<Tuple>(1, "2", '3'), 4, show) == make<Tuple>(
|
|
"(1 + (2 + (3 + 4)))",
|
|
"(2 + (3 + 4))",
|
|
"(3 + 4)",
|
|
4
|
|
));
|
|
//! [scanr]
|
|
|
|
}{
|
|
|
|
//! [scanr1]
|
|
auto to_string = [](auto x) {
|
|
return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
|
|
};
|
|
|
|
auto show = [=](auto x, auto y) {
|
|
return "(" + to_string(x) + " + " + to_string(y) + ")";
|
|
};
|
|
|
|
BOOST_HANA_RUNTIME_CHECK(scanr1(make<Tuple>(1, "2", '3'), show) == make<Tuple>(
|
|
"(1 + (2 + 3))",
|
|
"(2 + 3)",
|
|
'3'
|
|
));
|
|
//! [scanr1]
|
|
|
|
}{
|
|
|
|
//! [partition]
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
partition(tuple_c<int, 1, 2, 3, 4, 5, 6, 7>, [](auto x) {
|
|
return x % int_<2> != int_<0>;
|
|
})
|
|
==
|
|
pair(
|
|
tuple_c<int, 1, 3, 5, 7>,
|
|
tuple_c<int, 2, 4, 6>
|
|
)
|
|
);
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
partition(tuple_t<void, int, float, char, double>, trait<std::is_floating_point>)
|
|
==
|
|
pair(
|
|
tuple_t<float, double>,
|
|
tuple_t<void, int, char>
|
|
)
|
|
);
|
|
//! [partition]
|
|
|
|
}
|
|
|
|
}
|