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Add mp_intersperse

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Peter Dimov
2021-03-12 04:27:50 +02:00
parent 0dea2f1a2b
commit 080c3437ed
3 changed files with 60 additions and 0 deletions
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21
include/boost/mp11/algorithm.hpp
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@@ -1240,6 +1240,27 @@ 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>>;
namespace detail
{
template<class L, class S> struct mp_intersperse_impl
{
};
template<template<class...> class L, class S> struct mp_intersperse_impl<L<>, S>
{
using type = L<>;
};
template<template<class...> class L, class T1, class... T, class S> struct mp_intersperse_impl<L<T1, T...>, S>
{
using type = mp_append<L<T1>, L<S, T>...>;
};
} // namespace detail
template<class L, class S> using mp_intersperse = typename detail::mp_intersperse_impl<L, S>::type;
} // namespace mp11
} // namespace boost

1
test/Jamfile
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@@ -124,6 +124,7 @@ run mp_partial_sum.cpp ;
run mp_iterate.cpp ;
run mp_pairwise_fold.cpp ;
run mp_pairwise_fold_q.cpp ;
run mp_intersperse.cpp ;
# integral
run integral.cpp ;

38
test/mp_intersperse.cpp Normal file
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@@ -0,0 +1,38 @@
// 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 X5 {};
int main()
{
using boost::mp11::mp_list;
using boost::mp11::mp_intersperse;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<mp_list<>, void>, mp_list<>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<mp_list<X1>, void>, mp_list<X1>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<mp_list<X1, X2>, void>, mp_list<X1, void, X2>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<mp_list<X1, X2, X3>, void>, mp_list<X1, void, X2, void, X3>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<mp_list<X1, X2, X3, X4>, void>, mp_list<X1, void, X2, void, X3, void, X4>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<mp_list<X1, X2, X3, X4, X5>, void>, mp_list<X1, void, X2, void, X3, void, X4, void, X5>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<std::tuple<>, void>, std::tuple<>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<std::tuple<X1>, void>, std::tuple<X1>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<std::tuple<X1, X2>, void>, std::tuple<X1, void, X2>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<std::tuple<X1, X2, X3>, void>, std::tuple<X1, void, X2, void, X3>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<std::tuple<X1, X2, X3, X4>, void>, std::tuple<X1, void, X2, void, X3, void, X4>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_intersperse<std::tuple<X1, X2, X3, X4, X5>, void>, std::tuple<X1, void, X2, void, X3, void, X4, void, X5>>));
return boost::report_errors();
}