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Add mp_eval_or

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Peter Dimov
2019-02-14 21:03:13 +02:00
parent ca7e140827
commit fc8bfcf601
3 changed files with 56 additions and 0 deletions
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4
include/boost/mp11/utility.hpp
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@@ -153,6 +153,10 @@ template<class C, class T, class Q, class... U> using mp_eval_if_q = typename de
template<class C, class T, template<class...> class F, class... U> using mp_eval_if_not = mp_eval_if<mp_not<C>, T, F, U...>;
template<class C, class T, class Q, class... U> using mp_eval_if_not_q = mp_eval_if<mp_not<C>, T, Q::template fn, U...>;
// mp_eval_or
template<class T, template<class...> class F, class... U> using mp_eval_or = mp_eval_if_not<mp_valid<F, U...>, T, F, U...>;
template<class T, class Q, class... U> using mp_eval_or_q = mp_eval_or<T, Q::template fn, U...>;
// mp_cond
// so elegant; so doesn't work