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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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27
include/boost/algorithm/cxx11/one_of.hpp
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@@ -12,7 +12,6 @@
#ifndef BOOST_ALGORITHM_ONE_OF_HPP
#define BOOST_ALGORITHM_ONE_OF_HPP
#include <algorithm> // for std::find and std::find_if
#include <boost/algorithm/cxx11/none_of.hpp>
#include <boost/range/begin.hpp>
@@ -30,10 +29,14 @@ namespace boost { namespace algorithm {
template<typename InputIterator, typename Predicate>
BOOST_CXX14_CONSTEXPR bool one_of ( InputIterator first, InputIterator last, Predicate p )
{
InputIterator i = std::find_if (first, last, p);
if (i == last)
// find_if
for (; first != last; ++first)
if (p(*first))
break;
if (first == last)
return false; // Didn't occur at all
return boost::algorithm::none_of (++i, last, p);
return boost::algorithm::none_of (++first, last, p);
}
/// \fn one_of ( const Range &r, Predicate p )
@@ -43,7 +46,7 @@ BOOST_CXX14_CONSTEXPR bool one_of ( InputIterator first, InputIterator last, Pre
/// \param p A predicate for testing the elements of the range
///
template<typename Range, typename Predicate>
BOOST_CXX14_CONSTEXPR bool one_of ( const Range &r, Predicate p )
BOOST_CXX14_CONSTEXPR bool one_of ( const Range &r, Predicate p )
{
return boost::algorithm::one_of ( boost::begin (r), boost::end (r), p );
}
@@ -57,12 +60,16 @@ BOOST_CXX14_CONSTEXPR bool one_of ( const Range &r, Predicate p )
/// \param val A value to compare against
///
template<typename InputIterator, typename V>
bool one_of_equal ( InputIterator first, InputIterator last, const V &val )
BOOST_CXX14_CONSTEXPR bool one_of_equal ( InputIterator first, InputIterator last, const V &val )
{
InputIterator i = std::find (first, last, val); // find first occurrence of 'val'
if (i == last)
// find
for (; first != last; ++first)
if (*first == val)
break;
if (first == last)
return false; // Didn't occur at all
return boost::algorithm::none_of_equal (++i, last, val);
return boost::algorithm::none_of_equal (++first, last, val);
}
/// \fn one_of_equal ( const Range &r, const V &val )
@@ -72,7 +79,7 @@ bool one_of_equal ( InputIterator first, InputIterator last, const V &val )
/// \param val A value to compare against
///
template<typename Range, typename V>
bool one_of_equal ( const Range &r, const V &val )
BOOST_CXX14_CONSTEXPR bool one_of_equal ( const Range &r, const V &val )
{
return boost::algorithm::one_of_equal ( boost::begin (r), boost::end (r), val );
}

20
include/boost/algorithm/cxx14/equal.hpp
View File

@@ -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 )