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Add mp_power_set

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This commit is contained in:
Peter Dimov
2020-03-19 15:04:52 +02:00
parent 0851643af5
commit 64b9c1f874
3 changed files with 65 additions and 0 deletions
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31
include/boost/mp11/algorithm.hpp
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@@ -1127,6 +1127,37 @@ template<class L, class N> using mp_rotate_right = mp_rotate_right_c<L, std::siz
// mp_max_element<L, P>
// in detail/mp_min_element.hpp
// mp_power_set<L>
namespace detail
{
template<class L> struct mp_power_set_impl;
} // namespace detail
template<class L> using mp_power_set = typename detail::mp_power_set_impl<L>::type;
namespace detail
{
template<template<class...> class L> struct mp_power_set_impl< L<> >
{
using type = L< L<> >;
};
template<template<class...> class L, class T1, class... T> struct mp_power_set_impl< L<T1, T...> >
{
using S1 = mp_power_set< L<T...> >;
template<class L2> using _f = mp_push_front<L2, T1>;
using S2 = mp_transform<_f, S1>;
using type = mp_append< S1, S2 >;
};
} // namespace detail
} // namespace mp11
} // namespace boost

1
test/Jamfile
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@@ -119,6 +119,7 @@ run mp_pop_back.cpp ;
run mp_flatten.cpp ;
run mp_rotate_left.cpp ;
run mp_rotate_right.cpp ;
run mp_power_set.cpp ;
# integral
run integral.cpp ;

33
test/mp_power_set.cpp Normal file
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@@ -0,0 +1,33 @@
// Copyright 2020 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/algorithm.hpp>
#include <boost/mp11/list.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
#include <tuple>
struct X1 {};
struct X2 {};
struct X3 {};
int main()
{
using boost::mp11::mp_list;
using boost::mp11::mp_power_set;
BOOST_TEST_TRAIT_TRUE((std::is_same< mp_power_set< mp_list<> >, mp_list<mp_list<>> >));
BOOST_TEST_TRAIT_TRUE((std::is_same< mp_power_set< mp_list<X1> >, mp_list< mp_list<>, mp_list<X1> > >));
BOOST_TEST_TRAIT_TRUE((std::is_same< mp_power_set< mp_list<X2, X1> >, mp_list< mp_list<>, mp_list<X1>, mp_list<X2>, mp_list<X2, X1> > >));
BOOST_TEST_TRAIT_TRUE((std::is_same< mp_power_set< mp_list<X1, X1> >, mp_list< mp_list<>, mp_list<X1>, mp_list<X1>, mp_list<X1, X1> > >));
BOOST_TEST_TRAIT_TRUE((std::is_same< mp_power_set< mp_list<X3, X2, X1> >, mp_list< mp_list<>, mp_list<X1>, mp_list<X2>, mp_list<X2, X1>, mp_list<X3>, mp_list<X3, X1>, mp_list<X3, X2>, mp_list<X3, X2, X1> > >));
BOOST_TEST_TRAIT_TRUE((std::is_same< mp_power_set< std::tuple<> >, std::tuple<std::tuple<>> >));
BOOST_TEST_TRAIT_TRUE((std::is_same< mp_power_set< std::tuple<X1> >, std::tuple< std::tuple<>, std::tuple<X1> > >));
BOOST_TEST_TRAIT_TRUE((std::is_same< mp_power_set< std::tuple<X2, X1> >, std::tuple< std::tuple<>, std::tuple<X1>, std::tuple<X2>, std::tuple<X2, X1> > >));
BOOST_TEST_TRAIT_TRUE((std::is_same< mp_power_set< std::tuple<X1, X1> >, std::tuple< std::tuple<>, std::tuple<X1>, std::tuple<X1>, std::tuple<X1, X1> > >));
BOOST_TEST_TRAIT_TRUE((std::is_same< mp_power_set< std::tuple<X3, X2, X1> >, std::tuple< std::tuple<>, std::tuple<X1>, std::tuple<X2>, std::tuple<X2, X1>, std::tuple<X3>, std::tuple<X3, X1>, std::tuple<X3, X2>, std::tuple<X3, X2, X1> > >));
return boost::report_errors();
}