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Add mp_split (refs #59)

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This commit is contained in:
Peter Dimov
2021-03-12 06:18:45 +02:00
parent 4a1f343dbc
commit 0837acfde1
3 changed files with 75 additions and 0 deletions
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23
include/boost/mp11/algorithm.hpp
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@ -1240,6 +1240,7 @@ template<class L, class Q> using mp_pairwise_fold_impl = mp_transform_q<Q, mp_po
template<class L, class Q> using mp_pairwise_fold_q = mp_eval_if<mp_empty<L>, mp_clear<L>, detail::mp_pairwise_fold_impl, L, Q>;
template<class L, template<class...> class F> using mp_pairwise_fold = mp_pairwise_fold_q<L, mp_quote<F>>;
// mp_intersperse<L, S>
namespace detail
{
@ -1273,6 +1274,28 @@ template<template<class...> class L, class T1, class... T, class S> struct mp_in
template<class L, class S> using mp_intersperse = typename detail::mp_intersperse_impl<L, S>::type;
// mp_split<L, S>
namespace detail
{
template<class L, class S, class J> struct mp_split_impl;
} // namespace detail
template<class L, class S> using mp_split = typename detail::mp_split_impl<L, S, mp_find<L, S>>::type;
namespace detail
{
template<class L, class S, class J> using mp_split_impl_ = mp_push_front<mp_split<mp_drop_c<L, J::value + 1>, S>, mp_take<L, J>>;
template<class L, class S, class J> struct mp_split_impl
{
using type = mp_eval_if_c<mp_size<L>::value == J::value, mp_push_back<mp_clear<L>, L>, mp_split_impl_, L, S, J>;
};
} // namespace detail
} // namespace mp11
} // namespace boost

1
test/Jamfile
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@ -125,6 +125,7 @@ run mp_iterate.cpp ;
run mp_pairwise_fold.cpp ;
run mp_pairwise_fold_q.cpp ;
run mp_intersperse.cpp ;
run mp_split.cpp ;
# integral
run integral.cpp ;

51
test/mp_split.cpp Normal file
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@ -0,0 +1,51 @@
// Copyright 2021 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>
#include <utility>
struct X1 {};
struct X2 {};
struct X3 {};
struct X4 {};
struct S {};
int main()
{
using boost::mp11::mp_list;
using boost::mp11::mp_split;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<mp_list<>, void>, mp_list<mp_list<>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<mp_list<X1>, void>, mp_list<mp_list<X1>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<mp_list<X1, X2>, void>, mp_list<mp_list<X1, X2>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<mp_list<X1, X2, X3>, void>, mp_list<mp_list<X1, X2, X3>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<mp_list<S>, S>, mp_list<mp_list<>, mp_list<>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<mp_list<S, S>, S>, mp_list<mp_list<>, mp_list<>, mp_list<>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<mp_list<S, S, S>, S>, mp_list<mp_list<>, mp_list<>, mp_list<>, mp_list<>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<mp_list<X1, S, X2>, S>, mp_list<mp_list<X1>, mp_list<X2>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<mp_list<X1, X2, S, X3, X4>, S>, mp_list<mp_list<X1, X2>, mp_list<X3, X4>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<mp_list<S, X1, X2, S, S, X3, X4, S>, S>, mp_list<mp_list<>, mp_list<X1, X2>, mp_list<>, mp_list<X3, X4>, mp_list<>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<std::tuple<>, void>, std::tuple<std::tuple<>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<std::tuple<X1>, void>, std::tuple<std::tuple<X1>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<std::tuple<X1, X2>, void>, std::tuple<std::tuple<X1, X2>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<std::tuple<X1, X2, X3>, void>, std::tuple<std::tuple<X1, X2, X3>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<std::tuple<S>, S>, std::tuple<std::tuple<>, std::tuple<>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<std::tuple<S, S>, S>, std::tuple<std::tuple<>, std::tuple<>, std::tuple<>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<std::tuple<S, S, S>, S>, std::tuple<std::tuple<>, std::tuple<>, std::tuple<>, std::tuple<>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<std::tuple<X1, S, X2>, S>, std::tuple<std::tuple<X1>, std::tuple<X2>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<std::tuple<X1, X2, S, X3, X4>, S>, std::tuple<std::tuple<X1, X2>, std::tuple<X3, X4>>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_split<std::tuple<S, X1, X2, S, S, X3, X4, S>, S>, std::tuple<std::tuple<>, std::tuple<X1, X2>, std::tuple<>, std::tuple<X3, X4>, std::tuple<>>>));
return boost::report_errors();
}