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🆕 [mp_unique_if] Support for mp_unique with a predicate

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Problem:
- `mp_unique` doesn't support custom predicates.

Solution:
- Add `mp_unique_if` and `mp_unique_if_q` which allow to remove duplicates elements with a predicate.
This commit is contained in:
Kris Jusiak
2019-12-03 13:08:32 -07:00
parent f64bc319c0
commit aa11577812
5 changed files with 135 additions and 0 deletions
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include/boost/mp11/algorithm.hpp
+16
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@@ -950,6 +950,22 @@ template<template<class...> class L, class... T> struct mp_unique_impl<L<T...>>
template<class L> using mp_unique = typename detail::mp_unique_impl<L>::type;
namespace detail {
template <template<class...> class P> struct mp_unique_if_push_back {
template<class...> struct impl;
template <template<class...> class L, class... Ts, class T>
struct impl<L<Ts...>, T> {
using type = mp_if<mp_any<P<Ts, T>...>, L<Ts...>, L<Ts..., T>>;
};
template <class... T> using fn = typename impl<T...>::type;
};
} // namespace detail
// mp_unique_if<L, P>
template <class L, template<class...> class P>
using mp_unique_if = mp_fold_q<L, mp_clear<L>, detail::mp_unique_if_push_back<P>>;
template<class L, class Q> using mp_unique_if_q = mp_unique_if<L, Q::template fn>;
// mp_all_of<L, P>
template<class L, template<class...> class P> using mp_all_of = mp_bool< mp_count_if<L, P>::value == mp_size<L>::value >;
template<class L, class Q> using mp_all_of_q = mp_all_of<L, Q::template fn>;