Consolidate C++14 compatibility into new headers

beast/cxx14/algorithm.h

@@ -0,0 +1,90 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of Beast: https://github.com/vinniefalco/Beast
+    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef BEAST_CXX14_ALGORITHM_H_INCLUDED
+#define BEAST_CXX14_ALGORITHM_H_INCLUDED
+
+#include "config.h"
+#include "functional.h"
+
+#include <algorithm>
+
+namespace std {
+
+namespace detail {
+
+template <class Pred, class FwdIt1, class FwdIt2>
+bool equal (FwdIt1 first1, FwdIt1 last1,
+    FwdIt2 first2, FwdIt2 last2, Pred pred,
+        std::input_iterator_tag, std::input_iterator_tag)
+{
+    for (; first1 != last1 && first2 != last2; ++first1, ++first2)
+        if (! pred (*first1, *first2))
+            return false;
+    return first1 == last1 && first2 == last2;
+}
+
+template <class Pred, class RanIt1, class RanIt2>
+bool equal (RanIt1 first1, RanIt1 last1,
+    RanIt2 first2, RanIt2 last2, Pred pred,
+        random_access_iterator_tag,
+            random_access_iterator_tag )
+{
+    if (std::distance (first1, last1) !=
+            std::distance (first2, last2))
+        return false;
+    for (; first1 != last1; ++first1, ++first2)
+        if (! pred (*first1, *first2))
+            return false;
+    return true;
+}
+
+}
+
+/** C++14 implementation of std::equal. */
+/** @{ */
+template <class FwdIt1, class FwdIt2>
+bool equal (FwdIt1 first1, FwdIt1 last1,
+    FwdIt2 first2, FwdIt2 last2)
+{
+    return std::detail::equal (first1, last1,
+        first2, last2, std::equal_to <void>(),
+            typename std::iterator_traits <
+                FwdIt1>::iterator_category(),
+                    typename std::iterator_traits <
+                        FwdIt2>::iterator_category());
+}
+
+template <class FwdIt1, class FwdIt2, class Pred>
+bool equal (FwdIt1 first1, FwdIt1 last1,
+    FwdIt2 first2, FwdIt2 last2, Pred pred)
+{
+    return std::detail::equal <
+        typename std::add_lvalue_reference <Pred>::type> (
+            first1, last1, first2, last2, pred,
+                typename std::iterator_traits <
+                    FwdIt1>::iterator_category(),
+                        typename std::iterator_traits <
+                            FwdIt2>::iterator_category());
+}
+/** @} */
+
+}
+
+#endif