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Merge pull request #71 from grisumbras/feature/mp_valid_and_true

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implement mp_valid_and_true
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Peter Dimov
2022-02-17 00:12:05 +02:00
committed by GitHub
parent 28036d0bdb 1336c4f9c3
commit 7bc4e1ae9b
4 changed files with 67 additions and 0 deletions
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include/boost/mp11/utility.hpp
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@@ -161,6 +161,10 @@ template<class C, class T, class Q, class... U> using mp_eval_if_not_q = mp_eval
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_valid_and_true
template<template<class...> class F, class... T> using mp_valid_and_true = mp_eval_or<mp_false, F, T...>;
template<class Q, class... T> using mp_valid_and_true_q = mp_valid_and_true<Q::template fn, T...>;
// mp_cond
// so elegant; so doesn't work