More constexpr (re P0202) - equal and mismatch

llvm-svn: 322527

1 files changed, 39 insertions, 1 deletions

diff --git a/libcxx/test/std/algorithms/alg.nonmodifying/mismatch/mismatch.pass.cpp b/libcxx/test/std/algorithms/alg.nonmodifying/mismatch/mismatch.pass.cpp
index d4bc3fd70a8..f298bae9690 100644
--- a/libcxx/test/std/algorithms/alg.nonmodifying/mismatch/mismatch.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.nonmodifying/mismatch/mismatch.pass.cpp
@@ -11,8 +11,12 @@
 
 // template<InputIterator Iter1, InputIterator Iter2>
 //   requires HasEqualTo<Iter1::value_type, Iter2::value_type>
-//   pair<Iter1, Iter2>
+//   constexpr pair<Iter1, Iter2>   // constexpr after c++17
 //   mismatch(Iter1 first1, Iter1 last1, Iter2 first2);
+//
+// template<InputIterator Iter1, InputIterator Iter2Pred>
+//   constexpr pair<Iter1, Iter2>   // constexpr after c++17
+//   mismatch(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2); // C++14
 
 #include <algorithm>
 #include <cassert>
@@ -20,6 +24,40 @@
 #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;
+
+    auto p1 = std::mismatch(std::begin(ia), std::end(ia), std::begin(ic));
+    if (p1.first != ia+2 || p1.second != ic+2)
+        return false;
+        
+    auto p2 = std::mismatch(std::begin(ia), std::end(ia), std::begin(ic), std::end(ic));
+    if (p2.first != ia+2 || p2.second != ic+2)
+        return false;
+    
+    auto p3 = std::mismatch(std::begin(ib), std::end(ib), std::begin(ic));
+    if (p3.first != ib+2 || p3.second != ic+2)
+        return false;
+
+    auto p4 = std::mismatch(std::begin(ib), std::end(ib), std::begin(ic), std::end(ic));
+    if (p4.first != ib+2 || p4.second != ic+2)
+        return false;
+
+    auto p5 = std::mismatch(II(std::begin(ib)), II(std::end(ib)), II(std::begin(ic)));
+    if (p5.first != II(ib+2) || p5.second != II(ic+2))
+        return false;
+    auto p6 = std::mismatch(BI(std::begin(ib)), BI(std::end(ib)), BI(std::begin(ic)), BI(std::end(ic)));
+    if (p6.first != BI(ib+2) || p6.second != BI(ic+2))
+        return false;
+
+    return true;    
+    }
+#endif
 
 int main()
 {