More P0202 constexpr-ifying in <algorithm>. This commit handles replace/replace_if/replace_copy/replace_copy_if.

llvm-svn: 322975

1 files changed, 19 insertions, 2 deletions

diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.replace/replace_if.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.replace/replace_if.pass.cpp
index ebb2945d7c4..eeff4068740 100644
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.replace/replace_if.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.replace/replace_if.pass.cpp
@@ -13,16 +13,29 @@
 //   requires OutputIterator<Iter, Iter::reference>
 //         && OutputIterator<Iter, const T&>
 //         && CopyConstructible<Pred>
-//   void
+//   constexpr void      // constexpr after C++17
 //   replace_if(Iter first, Iter last, Pred pred, const T& new_value);
 
 #include <algorithm>
 #include <functional>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
-bool equalToTwo(int v) { return v == 2; }
+TEST_CONSTEXPR bool equalToTwo(int v) { return v == 2; }
+
+#if TEST_STD_VER > 17
+TEST_CONSTEXPR bool test_constexpr() {
+          int ia[]       = {0, 1, 2, 3, 4};
+    const int expected[] = {0, 1, 5, 3, 4};
+
+    std::replace_if(std::begin(ia), std::end(ia), equalToTwo, 5);
+    return std::equal(std::begin(ia), std::end(ia), std::begin(expected), std::end(expected))
+        ;
+    }
+#endif
+
 
 template <class Iter>
 void
@@ -44,4 +57,8 @@ int main()
     test<bidirectional_iterator<int*> >();
     test<random_access_iterator<int*> >();
     test<int*>();
+
+#if TEST_STD_VER > 17
+    static_assert(test_constexpr());
+#endif
 }