More constexpr algorithms from P0202. search/search_n

llvm-svn: 322566

1 files changed, 19 insertions, 1 deletions

diff --git a/libcxx/test/std/algorithms/alg.nonmodifying/alg.search/search_pred.pass.cpp b/libcxx/test/std/algorithms/alg.nonmodifying/alg.search/search_pred.pass.cpp
index 192da03d67b..21a17116fc8 100644
--- a/libcxx/test/std/algorithms/alg.nonmodifying/alg.search/search_pred.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.nonmodifying/alg.search/search_pred.pass.cpp
@@ -11,14 +11,28 @@
 
 // template<ForwardIterator Iter1, ForwardIterator Iter2>
 //   requires HasEqualTo<Iter1::value_type, Iter2::value_type>
-//   Iter1
+//   constexpr Iter1     // constexpr after C++17
 //   search(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2);
 
 #include <algorithm>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
+#if TEST_STD_VER > 17
+TEST_CONSTEXPR bool eq(int a, int b) { return a == b; }
+
+TEST_CONSTEXPR bool test_constexpr() {
+    int ia[] = {0, 1, 2, 3};
+    int ib[] = {0, 1, 5, 3};
+    int ic[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
+    return    (std::search(std::begin(ic), std::end(ic), std::begin(ia), std::end(ia), eq) == ic+3)
+           && (std::search(std::begin(ic), std::end(ic), std::begin(ib), std::end(ib), eq) == std::end(ic))
+           ;
+    }
+#endif
+
 struct count_equal
 {
     static unsigned count;
@@ -108,4 +122,8 @@ int main()
     test<random_access_iterator<const int*>, forward_iterator<const int*> >();
     test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
+
+#if TEST_STD_VER > 17
+    static_assert(test_constexpr());
+#endif
 }