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Fix function application in mp_map_update

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This commit is contained in:
Peter Dimov
2017-03-14 22:40:47 +02:00
parent 6fb4cee7b2
commit 5a4fb7f832
2 changed files with 3 additions and 7 deletions
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8
include/boost/mp11/map.hpp
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@@ -53,12 +53,8 @@ template<class M, class T, template<class...> class F> struct mp_map_update_impl
{
template<class U> using _f = std::is_same<mp_first<T>, mp_first<U>>;
// _f2<L<X, Y...>> -> F<Y...>
// _f2<pair<X, Y>> -> F<Y>
template<class L> using _f2 = mp_rename<mp_rest<mp_rename<L, mp_list>>, F>;
// _f3<L<X, Y...>> -> L<X, F<Y...>>
template<class L> using _f3 = mp_assign<L, mp_list<mp_first<L>, _f2<L>>>;
// _f3<L<X, Y...>> -> L<X, F<X, Y...>>
template<class L> using _f3 = mp_assign<L, mp_list<mp_first<L>, mp_rename<L, F>>>;
using type = mp_if< mp_map_contains<M, mp_first<T>>, mp_transform_if<_f, _f3, M>, mp_push_back<M, T> >;
};

2
test/mp_map_update.cpp
View File

@@ -17,7 +17,7 @@
using boost::mp_int;
template<class T> using inc = mp_int<T::value + 1>;
template<class T, class U> using inc = mp_int<U::value + 1>;
int main()
{