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fix constexpr-ness of a couple of algorithhms - and tests. Based on Pull Request #44 by Flast - thanks!

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This commit is contained in:
Marshall Clow
2018-04-04 11:18:38 -07:00
parent 509201f29f
commit 3af7acabc7
7 changed files with 52 additions and 47 deletions
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20
include/boost/algorithm/cxx14/equal.hpp
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@ -12,16 +12,8 @@
#ifndef BOOST_ALGORITHM_EQUAL_HPP
#define BOOST_ALGORITHM_EQUAL_HPP
#include <algorithm> // for std::equal
#include <iterator>
#ifdef __cpp_lib_array_constexpr // or cpp17 compiler
// if compiled according to C++17 standard or std functions are constexpr
#define BOOST_CONSTEXPR_IF_STD_CONSTEXPR constexpr
#else
#define BOOST_CONSTEXPR_IF_STD_CONSTEXPR
#endif
namespace boost { namespace algorithm {
namespace detail {
@ -32,7 +24,7 @@ namespace detail {
};
template <class RandomAccessIterator1, class RandomAccessIterator2, class BinaryPredicate>
BOOST_CONSTEXPR_IF_STD_CONSTEXPR
BOOST_CXX14_CONSTEXPR
bool equal ( RandomAccessIterator1 first1, RandomAccessIterator1 last1,
RandomAccessIterator2 first2, RandomAccessIterator2 last2, BinaryPredicate pred,
std::random_access_iterator_tag, std::random_access_iterator_tag )
@ -40,12 +32,16 @@ namespace detail {
// Random-access iterators let is check the sizes in constant time
if ( std::distance ( first1, last1 ) != std::distance ( first2, last2 ))
return false;
// If we know that the sequences are the same size, the original version is fine
return std::equal ( first1, last1, first2, pred );
// std::equal
for (; first1 != last1; ++first1, ++first2)
if (!pred(*first1, *first2))
return false;
return true;
}
template <class InputIterator1, class InputIterator2, class BinaryPredicate>
BOOST_CXX14_CONSTEXPR
BOOST_CXX14_CONSTEXPR
bool equal ( InputIterator1 first1, InputIterator1 last1,
InputIterator2 first2, InputIterator2 last2, BinaryPredicate pred,
std::input_iterator_tag, std::input_iterator_tag )