mirror of
https://github.com/boostorg/hana.git
synced 2026-01-31 20:22:10 +00:00
89 lines
1.9 KiB
C++
89 lines
1.9 KiB
C++
/*
|
|
@copyright Louis Dionne 2014
|
|
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/array.hpp>
|
|
#include <boost/hana/ext/std/tuple.hpp>
|
|
#include <boost/hana/foldable.hpp>
|
|
#include <boost/hana/integral_constant.hpp>
|
|
#include <boost/hana/logical.hpp>
|
|
#include <boost/hana/range.hpp>
|
|
#include <boost/hana/sequence.hpp>
|
|
#include <boost/hana/tuple.hpp>
|
|
|
|
#include <array>
|
|
#include <string>
|
|
#include <tuple>
|
|
using namespace boost::hana;
|
|
|
|
|
|
int main() {
|
|
|
|
{
|
|
|
|
//! [make<Tuple>]
|
|
auto xs = make<Tuple>(1, 2, '3', std::string{"456"});
|
|
|
|
constexpr auto ys = make<Tuple>(1, '2', 3.456);
|
|
//! [make<Tuple>]
|
|
(void)xs; (void)ys;
|
|
|
|
}{
|
|
|
|
//! [tuple_t]
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
to<Tuple>(tuple_t<int, char, void, int(float)>)
|
|
==
|
|
make<Tuple>(type<int>, type<char>, type<void>, type<int(float)>)
|
|
);
|
|
//! [tuple_t]
|
|
|
|
}{
|
|
|
|
//! [tuple_c]
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
to<Tuple>(tuple_c<int, 0, 1, 2>)
|
|
==
|
|
make<Tuple>(int_<0>, int_<1>, int_<2>)
|
|
);
|
|
BOOST_HANA_CONSTANT_CHECK(head(tuple_c<int, 0, 1, 2>) == int_<0>);
|
|
//! [tuple_c]
|
|
|
|
}{
|
|
|
|
//! [Foldable]
|
|
using namespace literals;
|
|
|
|
constexpr auto numbers = tuple_c<int, 5, -1, 0, -7, -2, 0, -5, 4>;
|
|
constexpr auto negatives = tuple_c<int, -1, -7, -2, -5>;
|
|
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto keep_negatives = [](auto n, auto acc) {
|
|
return if_(n < 0_c, prepend(n, acc), acc);
|
|
};
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(foldr(numbers, tuple_c<int>, keep_negatives) == negatives);
|
|
//! [Foldable]
|
|
|
|
}{
|
|
|
|
//! [Tuple_interop]
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
to<Tuple>(std::make_tuple(1, '2', 3.3)) == make<Tuple>(1, '2', 3.3)
|
|
);
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
to<Tuple>(range(int_<1>, int_<4>)) == make<Tuple>(int_<1>, int_<2>, int_<3>)
|
|
);
|
|
|
|
BOOST_HANA_CONSTEXPR_CHECK(
|
|
to<Tuple>(std::array<int, 3>{{1, 2, 3}}) == make<Tuple>(1, 2, 3)
|
|
);
|
|
//! [Tuple_interop]
|
|
|
|
}
|
|
|
|
} |