1 files changed, 29 insertions, 1 deletions
diff --git a/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp
index e867b86b8312c..656c7310f4d0f 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp
@@ -11,8 +11,13 @@
 
 // template<InputIterator Iter1, InputIterator Iter2>
 //   requires HasEqualTo<Iter1::value_type, Iter2::value_type>
-//   bool
+//   constexpr bool     // constexpr after c++17
 //   equal(Iter1 first1, Iter1 last1, Iter2 first2);
+//
+// Introduced in C++14:
+// template<InputIterator Iter1, InputIterator Iter2>
+//   constexpr bool     // constexpr after c++17
+//   equal(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2);
 
 #include <algorithm>
 #include <cassert>
@@ -20,6 +25,25 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
+#if TEST_STD_VER > 17
+TEST_CONSTEXPR bool test_constexpr() {
+    int ia[] = {1, 3, 6, 7};
+    int ib[] = {1, 3};
+    int ic[] = {1, 3, 5, 7};
+    typedef input_iterator<int*>         II;
+    typedef bidirectional_iterator<int*> BI;
+
+    return !std::equal(std::begin(ia), std::end(ia), std::begin(ic))
+        && !std::equal(std::begin(ia), std::end(ia), std::begin(ic), std::end(ic))
+        &&  std::equal(std::begin(ib), std::end(ib), std::begin(ic))
+        && !std::equal(std::begin(ib), std::end(ib), std::begin(ic), std::end(ic))
+
+        &&  std::equal(II(std::begin(ib)), II(std::end(ib)), II(std::begin(ic)))
+        && !std::equal(BI(std::begin(ib)), BI(std::end(ib)), BI(std::begin(ic)), BI(std::end(ic)))
+        ;
+    }
+#endif
+
 
 int main()
 {
@@ -61,4 +85,8 @@ int main()
                        random_access_iterator<const int*>(ia+s-1)));
 
 #endif
+
+#if TEST_STD_VER > 17
+    static_assert(test_constexpr());
+#endif
 }