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Implement min_element and max_element and sever algorithm dependency

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This commit is contained in:
Glen Fernandes
2019-04-22 17:59:19 -04:00
parent cecebeea51
commit 4ec46acdf5
3 changed files with 88 additions and 18 deletions
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40
include/boost/range/algorithm/max_element.hpp
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@ -3,17 +3,18 @@
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Copyright 2019 Glen Joseph Fernandes (glenjofe@gmail.com)
//
// For more information, see http://www.boost.org/libs/range/
//
#ifndef BOOST_RANGE_ALGORITHM_MAX_ELEMENT_HPP_INCLUDED
#define BOOST_RANGE_ALGORITHM_MAX_ELEMENT_HPP_INCLUDED
#include <boost/algorithm/minmax_element.hpp>
#include <boost/concept_check.hpp>
#include <boost/range/begin.hpp>
#include <boost/range/end.hpp>
#include <boost/range/concepts.hpp>
#include <boost/range/detail/less.hpp>
#include <boost/range/detail/range_return.hpp>
namespace boost
@ -21,6 +22,27 @@ namespace boost
namespace range
{
namespace detail
{
template<typename Iterator, class Predicate>
inline Iterator
max_element(Iterator first, Iterator last, Predicate comp)
{
if (first == last) {
return last;
}
Iterator result = first;
while (++first != last) {
if (comp(*result, *first)) {
result = first;
}
}
return result;
}
} // namespace detail
/// \brief template function max_element
///
/// range-based version of the max_element std algorithm
@ -32,7 +54,7 @@ inline BOOST_DEDUCED_TYPENAME range_iterator<ForwardRange>::type
max_element(ForwardRange& rng)
{
BOOST_RANGE_CONCEPT_ASSERT(( ForwardRangeConcept<ForwardRange> ));
return boost::first_max_element(boost::begin(rng), boost::end(rng));
return detail::max_element(boost::begin(rng), boost::end(rng), detail::less());
}
/// \overload
@ -41,7 +63,7 @@ inline BOOST_DEDUCED_TYPENAME range_iterator<const ForwardRange>::type
max_element(const ForwardRange& rng)
{
BOOST_RANGE_CONCEPT_ASSERT(( ForwardRangeConcept<const ForwardRange> ));
return boost::first_max_element(boost::begin(rng), boost::end(rng));
return detail::max_element(boost::begin(rng), boost::end(rng), detail::less());
}
/// \overload
@ -50,7 +72,7 @@ inline BOOST_DEDUCED_TYPENAME range_iterator<ForwardRange>::type
max_element(ForwardRange& rng, BinaryPredicate pred)
{
BOOST_RANGE_CONCEPT_ASSERT(( ForwardRangeConcept<ForwardRange> ));
return boost::first_max_element(boost::begin(rng), boost::end(rng), pred);
return detail::max_element(boost::begin(rng), boost::end(rng), pred);
}
/// \overload
@ -59,7 +81,7 @@ inline BOOST_DEDUCED_TYPENAME range_iterator<const ForwardRange>::type
max_element(const ForwardRange& rng, BinaryPredicate pred)
{
BOOST_RANGE_CONCEPT_ASSERT(( ForwardRangeConcept<const ForwardRange> ));
return boost::first_max_element(boost::begin(rng), boost::end(rng), pred);
return detail::max_element(boost::begin(rng), boost::end(rng), pred);
}
// range_return overloads
@ -71,7 +93,7 @@ max_element(ForwardRange& rng)
{
BOOST_RANGE_CONCEPT_ASSERT(( ForwardRangeConcept<ForwardRange> ));
return range_return<ForwardRange,re>::pack(
boost::first_max_element(boost::begin(rng), boost::end(rng)),
detail::max_element(boost::begin(rng), boost::end(rng), detail::less()),
rng);
}
@ -82,7 +104,7 @@ max_element(const ForwardRange& rng)
{
BOOST_RANGE_CONCEPT_ASSERT(( ForwardRangeConcept<const ForwardRange> ));
return range_return<const ForwardRange,re>::pack(
boost::first_max_element(boost::begin(rng), boost::end(rng)),
detail::max_element(boost::begin(rng), boost::end(rng), detail::less()),
rng);
}
@ -93,7 +115,7 @@ max_element(ForwardRange& rng, BinaryPredicate pred)
{
BOOST_RANGE_CONCEPT_ASSERT(( ForwardRangeConcept<ForwardRange> ));
return range_return<ForwardRange,re>::pack(
boost::first_max_element(boost::begin(rng), boost::end(rng), pred),
detail::max_element(boost::begin(rng), boost::end(rng), pred),
rng);
}
@ -104,7 +126,7 @@ max_element(const ForwardRange& rng, BinaryPredicate pred)
{
BOOST_RANGE_CONCEPT_ASSERT(( ForwardRangeConcept<const ForwardRange> ));
return range_return<const ForwardRange,re>::pack(
boost::first_max_element(boost::begin(rng), boost::end(rng), pred),
detail::max_element(boost::begin(rng), boost::end(rng), pred),
rng);
}