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Extracted min_category as a variadic metafunction.

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The new min_category is similar to minimum_category but accepts variable
number of iterator categories on input instead of just two, and also does
not depend on Boost.MPL for lambda placeholders. The existing minimum_category
trait has been reimplemented in terms of min_category and deprecated.

We don't yet emit deprecation warnings as there is still code that uses
the old trait which we first need to update. Eventually, minimum_category
will emit warnings and will be removed.
This commit is contained in:
Andrey Semashev
2025-02-05 18:51:37 +03:00
parent b30cbf634c
commit dec7d0f24c
8 changed files with 165 additions and 45 deletions
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test/min_category.cpp
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// Copyright Andrey Semashev 2025.
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
#include <boost/iterator/min_category.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <iterator>
#include <type_traits>
using std::is_same;
using boost::iterators::min_category;
using boost::iterators::min_category_t;
int main(int, char*[])
{
BOOST_TEST_TRAIT_TRUE((is_same<min_category<std::forward_iterator_tag>::type, std::forward_iterator_tag>));
BOOST_TEST_TRAIT_TRUE((is_same<min_category<std::forward_iterator_tag, std::random_access_iterator_tag>::type, std::forward_iterator_tag>));
BOOST_TEST_TRAIT_TRUE((is_same<min_category<std::random_access_iterator_tag, std::forward_iterator_tag>::type, std::forward_iterator_tag>));
BOOST_TEST_TRAIT_TRUE((is_same<min_category<std::random_access_iterator_tag, std::random_access_iterator_tag>::type, std::random_access_iterator_tag>));
BOOST_TEST_TRAIT_TRUE((is_same<min_category<std::forward_iterator_tag, std::bidirectional_iterator_tag, std::random_access_iterator_tag>::type, std::forward_iterator_tag>));
BOOST_TEST_TRAIT_TRUE((is_same<min_category<std::random_access_iterator_tag, std::bidirectional_iterator_tag, std::forward_iterator_tag>::type, std::forward_iterator_tag>));
BOOST_TEST_TRAIT_TRUE((is_same<min_category_t<std::forward_iterator_tag>, std::forward_iterator_tag>));
BOOST_TEST_TRAIT_TRUE((is_same<min_category_t<std::forward_iterator_tag, std::random_access_iterator_tag>, std::forward_iterator_tag>));
BOOST_TEST_TRAIT_TRUE((is_same<min_category_t<std::random_access_iterator_tag, std::forward_iterator_tag>, std::forward_iterator_tag>));
BOOST_TEST_TRAIT_TRUE((is_same<min_category_t<std::random_access_iterator_tag, std::random_access_iterator_tag>, std::random_access_iterator_tag>));
BOOST_TEST_TRAIT_TRUE((is_same<min_category_t<std::forward_iterator_tag, std::bidirectional_iterator_tag, std::random_access_iterator_tag>, std::forward_iterator_tag>));
BOOST_TEST_TRAIT_TRUE((is_same<min_category_t<std::random_access_iterator_tag, std::bidirectional_iterator_tag, std::forward_iterator_tag>, std::forward_iterator_tag>));
return boost::report_errors();
}