forked from boostorg/mp11
Add mp_fold, mp_reverse_fold.
This commit is contained in:
@@ -714,7 +714,70 @@ template<template<class...> class L, class T1, class T2, class T3, class T4, cla
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template<class L> using mp_reverse = typename detail::mp_reverse_impl<L>::type;
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// mp_fold<L, V, F>
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namespace detail
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{
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template<class L, class V, template<class...> class F> struct mp_fold_impl;
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#if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, <= 1800 )
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template<template<class...> class L, class... T, class V, template<class...> class F> struct mp_fold_impl<L<T...>, V, F>
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{
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static_assert( sizeof...(T) == 0, "T... must be empty" );
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using type = V;
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};
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#else
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template<template<class...> class L, class V, template<class...> class F> struct mp_fold_impl<L<>, V, F>
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{
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using type = V;
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};
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#endif
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template<template<class...> class L, class T1, class... T, class V, template<class...> class F> struct mp_fold_impl<L<T1, T...>, V, F>
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{
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using type = typename mp_fold_impl<L<T...>, F<V, T1>, F>::type;
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};
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} // namespace detail
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template<class L, class V, template<class...> class F> using mp_fold = typename detail::mp_fold_impl<L, V, F>::type;
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// mp_reverse_fold<L, V, F>
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namespace detail
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{
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template<class L, class V, template<class...> class F> struct mp_reverse_fold_impl;
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#if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, <= 1800 )
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template<template<class...> class L, class... T, class V, template<class...> class F> struct mp_reverse_fold_impl<L<T...>, V, F>
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{
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static_assert( sizeof...(T) == 0, "T... must be empty" );
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using type = V;
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};
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#else
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template<template<class...> class L, class V, template<class...> class F> struct mp_reverse_fold_impl<L<>, V, F>
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{
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using type = V;
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};
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#endif
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template<template<class...> class L, class T1, class... T, class V, template<class...> class F> struct mp_reverse_fold_impl<L<T1, T...>, V, F>
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{
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using rest = typename mp_reverse_fold_impl<L<T...>, V, F>::type;
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using type = F<T1, rest>;
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};
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} // namespace detail
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template<class L, class V, template<class...> class F> using mp_reverse_fold = typename detail::mp_reverse_fold_impl<L, V, F>::type;
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// mp_unique<L>
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} // namespace boost
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@@ -50,6 +50,8 @@ run mp_find_index_if.cpp : : : $(REQ) ;
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run mp_find.cpp : : : $(REQ) ;
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run mp_find_if.cpp : : : $(REQ) ;
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run mp_reverse.cpp : : : $(REQ) ;
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run mp_fold.cpp : : : $(REQ) ;
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run mp_reverse_fold.cpp : : : $(REQ) ;
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# integral
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run integral.cpp : : : $(REQ) ;
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57
test/mp_fold.cpp
Normal file
57
test/mp_fold.cpp
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@@ -0,0 +1,57 @@
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// Copyright 2015 Peter Dimov.
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//
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// Distributed under the Boost Software License, Version 1.0.
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//
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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#include <boost/mp11/algorithm.hpp>
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#include <boost/mp11/list.hpp>
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#include <boost/core/lightweight_test_trait.hpp>
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#include <type_traits>
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#include <tuple>
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struct X1 {};
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struct X2 {};
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struct X3 {};
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struct X4 {};
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template<class T1, class T2> struct F {};
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int main()
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{
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using boost::mp_list;
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using boost::mp_fold;
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{
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<>, void, F>, void>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1>, void, F>, F<void, X1>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1, X2>, void, F>, F<F<void, X1>, X2>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1, X2, X3>, void, F>, F<F<F<void, X1>, X2>, X3>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1, X2, X3, X4>, void, F>, F<F<F<F<void, X1>, X2>, X3>, X4>>));
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}
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{
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<>, void, F>, void>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1>, void, F>, F<void, X1>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2>, void, F>, F<F<void, X1>, X2>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3>, void, F>, F<F<F<void, X1>, X2>, X3>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3, X4>, void, F>, F<F<F<F<void, X1>, X2>, X3>, X4>>));
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}
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using boost::mp_push_back;
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{
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3, X4>, mp_list<>, mp_push_back>, mp_list<X1, X2, X3, X4>>));
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}
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using boost::mp_push_front;
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{
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3, X4>, mp_list<>, mp_push_front>, mp_list<X4, X3, X2, X1>>));
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}
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return boost::report_errors();
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}
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56
test/mp_reverse_fold.cpp
Normal file
56
test/mp_reverse_fold.cpp
Normal file
@@ -0,0 +1,56 @@
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// Copyright 2015 Peter Dimov.
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//
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// Distributed under the Boost Software License, Version 1.0.
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//
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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#include <boost/mp11/algorithm.hpp>
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#include <boost/mp11/list.hpp>
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#include <boost/core/lightweight_test_trait.hpp>
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#include <type_traits>
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#include <tuple>
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struct X1 {};
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struct X2 {};
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struct X3 {};
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struct X4 {};
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template<class T1, class T2> struct F {};
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template<class T, class L> using rev_push_back = boost::mp_push_back<L, T>;
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template<class T, class L> using rev_push_front = boost::mp_push_front<L, T>;
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int main()
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{
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using boost::mp_list;
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using boost::mp_reverse_fold;
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{
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<mp_list<>, void, F>, void>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<mp_list<X1>, void, F>, F<X1, void>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<mp_list<X1, X2>, void, F>, F<X1, F<X2, void>>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<mp_list<X1, X2, X3>, void, F>, F<X1, F<X2, F<X3, void>>>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<mp_list<X1, X2, X3, X4>, void, F>, F<X1, F<X2, F<X3, F<X4, void>>>>>));
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}
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{
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<std::tuple<>, void, F>, void>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<std::tuple<X1>, void, F>, F<X1, void>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<std::tuple<X1, X2>, void, F>, F<X1, F<X2, void>>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<std::tuple<X1, X2, X3>, void, F>, F<X1, F<X2, F<X3, void>>>>));
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<std::tuple<X1, X2, X3, X4>, void, F>, F<X1, F<X2, F<X3, F<X4, void>>>>>));
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}
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{
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<std::tuple<X1, X2, X3, X4>, mp_list<>, rev_push_back>, mp_list<X4, X3, X2, X1>>));
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}
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{
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BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<std::tuple<X1, X2, X3, X4>, mp_list<>, rev_push_front>, mp_list<X1, X2, X3, X4>>));
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}
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return boost::report_errors();
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}
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