1 files changed, 71 insertions, 0 deletions
diff --git a/test/std/algorithms/alg.nonmodifying/mismatch/mismatch_pred.pass.cpp b/test/std/algorithms/alg.nonmodifying/mismatch/mismatch_pred.pass.cpp
new file mode 100644
index 0000000000000..8d85d993cd612
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+++ b/test/std/algorithms/alg.nonmodifying/mismatch/mismatch_pred.pass.cpp
@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <algorithm>
+
+// template<InputIterator Iter1, InputIterator Iter2,
+//          Predicate<auto, Iter1::value_type, Iter2::value_type> Pred>
+//   requires CopyConstructible<Pred>
+//   pair<Iter1, Iter2>
+//   mismatch(Iter1 first1, Iter1 last1, Iter2 first2, Pred pred);
+
+#include <algorithm>
+#include <functional>
+#include <cassert>
+
+#include "test_iterators.h"
+#include "counting_predicates.hpp"
+
+#if _LIBCPP_STD_VER > 11
+#define HAS_FOUR_ITERATOR_VERSION
+#endif
+
+int main()
+{
+    int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
+    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
+    int ib[] = {0, 1, 2, 3, 0, 1, 2, 3};
+    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
+    
+    typedef input_iterator<const int*> II;
+    typedef random_access_iterator<const int*>  RAI;
+    typedef std::equal_to<int> EQ;
+
+    assert(std::mismatch(II(ia), II(ia + sa), II(ib), EQ())
+            == (std::pair<II, II>(II(ia+3), II(ib+3))));
+    assert(std::mismatch(RAI(ia), RAI(ia + sa), RAI(ib), EQ())
+            == (std::pair<RAI, RAI>(RAI(ia+3), RAI(ib+3))));
+
+    binary_counting_predicate<EQ, int> bcp((EQ()));
+    assert(std::mismatch(RAI(ia), RAI(ia + sa), RAI(ib), std::ref(bcp))
+            == (std::pair<RAI, RAI>(RAI(ia+3), RAI(ib+3))));
+    assert(bcp.count() > 0 && bcp.count() < sa);
+    bcp.reset();
+        
+#ifdef HAS_FOUR_ITERATOR_VERSION
+    assert(std::mismatch(II(ia), II(ia + sa), II(ib), II(ib + sb), EQ())
+            == (std::pair<II, II>(II(ia+3), II(ib+3))));
+    assert(std::mismatch(RAI(ia), RAI(ia + sa), RAI(ib), RAI(ib + sb), EQ())
+            == (std::pair<RAI, RAI>(RAI(ia+3), RAI(ib+3))));
+
+    assert(std::mismatch(II(ia), II(ia + sa), II(ib), II(ib + sb), std::ref(bcp))
+            == (std::pair<II, II>(II(ia+3), II(ib+3))));
+    assert(bcp.count() > 0 && bcp.count() < std::min(sa, sb));
+#endif
+
+    assert(std::mismatch(ia, ia + sa, ib, EQ()) ==
+           (std::pair<int*,int*>(ia+3,ib+3)));
+
+#ifdef HAS_FOUR_ITERATOR_VERSION
+    assert(std::mismatch(ia, ia + sa, ib, ib + sb, EQ()) ==
+           (std::pair<int*,int*>(ia+3,ib+3)));
+    assert(std::mismatch(ia, ia + sa, ib, ib + 2, EQ()) ==
+           (std::pair<int*,int*>(ia+2,ib+2)));
+#endif
+}