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SFINAE-fail mp_transform on lists of different sizes

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This commit is contained in:
Peter Dimov
2017-05-18 16:13:55 +03:00
parent 611ea810bd
commit 02385ac83d
3 changed files with 64 additions and 6 deletions
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27
include/boost/mp11/algorithm.hpp
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@@ -12,6 +12,7 @@
#include <boost/mp11/set.hpp>
#include <boost/mp11/integral.hpp>
#include <boost/mp11/utility.hpp>
#include <boost/mp11/function.hpp>
#include <boost/mp11/detail/mp_count.hpp>
#include <boost/mp11/detail/mp_plus.hpp>
#include <boost/mp11/detail/mp_map_find.hpp>
@@ -59,7 +60,9 @@ template<class L, class V, template<class...> class F> using mp_fold = typename
namespace detail
{
template<template<class...> class F, class... L> struct mp_transform_impl;
template<template<class...> class F, class... L> struct mp_transform_impl
{
};
template<template<class...> class F, template<class...> class L, class... T> struct mp_transform_impl<F, L<T...>>
{
@@ -68,19 +71,33 @@ template<template<class...> class F, template<class...> class L, class... T> str
template<template<class...> class F, template<class...> class L1, class... T1, template<class...> class L2, class... T2> struct mp_transform_impl<F, L1<T1...>, L2<T2...>>
{
static_assert( sizeof...(T1) == sizeof...(T2), "The arguments of mp_transform should be of the same size" );
using type = L1<F<T1,T2>...>;
};
template<template<class...> class F, template<class...> class L1, class... T1, template<class...> class L2, class... T2, template<class...> class L3, class... T3> struct mp_transform_impl<F, L1<T1...>, L2<T2...>, L3<T3...>>
{
static_assert( sizeof...(T1) == sizeof...(T2) && sizeof...(T1) == sizeof...(T3), "The arguments of mp_transform should be of the same size" );
using type = L1<F<T1,T2,T3>...>;
};
#if BOOST_WORKAROUND( BOOST_MSVC, == 1900 )
template<class... L> using mp_same_size_1 = mp_same<mp_size<L>...>;
template<class... L> struct mp_same_size_2: mp_defer<mp_same_size_1, L...> {};
#endif
} // namespace detail
template<template<class...> class F, class... L> using mp_transform = typename detail::mp_transform_impl<F, L...>::type;
#if BOOST_WORKAROUND( BOOST_MSVC, == 1900 )
template<template<class...> class F, class... L> using mp_transform = typename mp_if<typename detail::mp_same_size_2<L...>::type, detail::mp_transform_impl<F, L...>>::type;
#else
template<template<class...> class F, class... L> using mp_transform = typename mp_if<mp_same<mp_size<L>...>, detail::mp_transform_impl<F, L...>>::type;
#endif
template<class Q, class... L> using mp_transform_q = mp_transform<Q::template fn, L...>;
namespace detail
@@ -88,8 +105,6 @@ namespace detail
template<template<class...> class F, template<class...> class L1, class... T1, template<class...> class L2, class... T2, template<class...> class L3, class... T3, template<class...> class L4, class... T4, class... L> struct mp_transform_impl<F, L1<T1...>, L2<T2...>, L3<T3...>, L4<T4...>, L...>
{
static_assert( sizeof...(T1) == sizeof...(T2) && sizeof...(T1) == sizeof...(T3) && sizeof...(T1) == sizeof...(T4), "The arguments of mp_transform should be of the same size" );
using A1 = L1<mp_list<T1, T2, T3, T4>...>;
template<class V, class T> using _f = mp_transform<mp_push_back, V, T>;

1
test/Jamfile.v2
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@@ -35,6 +35,7 @@ run mp_apply_q.cpp : : : $(REQ) ;
run mp_assign.cpp : : : $(REQ) ;
run mp_clear.cpp : : : $(REQ) ;
run mp_transform.cpp : : : $(REQ) ;
run mp_transform_sf.cpp : : : $(REQ) ;
run mp_transform_if.cpp : : : $(REQ) ;
run mp_fill.cpp : : : $(REQ) ;
run mp_count.cpp : : : $(REQ) ;

42
test/mp_transform_sf.cpp Normal file
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@@ -0,0 +1,42 @@
// Copyright 2017 Peter Dimov.
//
// Distributed under the Boost Software License, Version 1.0.
//
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/algorithm.hpp>
#include <boost/mp11/utility.hpp>
#include <boost/mp11/list.hpp>
#include <boost/core/lightweight_test_trait.hpp>
using boost::mp11::mp_transform;
using boost::mp11::mp_list;
using boost::mp11::mp_valid;
template<class...> using F = void;
template<class... L> using transform = mp_transform<F, L...>;
int main()
{
BOOST_TEST_TRAIT_FALSE((mp_valid<transform>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, void, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, void, void, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, void, void, void, void, void>));
#if !BOOST_WORKAROUND( BOOST_MSVC, <= 1800 )
BOOST_TEST_TRAIT_TRUE((mp_valid<transform, mp_list<>>));
#endif
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, mp_list<>, mp_list<void>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, mp_list<>, mp_list<>, mp_list<void>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, mp_list<>, mp_list<>, mp_list<>, mp_list<void>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, mp_list<>, mp_list<>, mp_list<>, mp_list<>, mp_list<void>>));
return boost::report_errors();
}