Allow a standard library to implement conditional noexcept for optional and unique_ptr hash functions.

These tests were unconditionally asserting that optional and unique_ptr declare throwing hashes, but MSVC++ implements conditional noexcept forwarding that of the underlying hash function. As a result we were failing these tests but there's nothing forbidding strengthening noexcept in that way.

Changed the ASSERT_NOT_NOEXCEPT asserts to use types which themselves have non-noexcept hash functions.

llvm-svn: 299734

libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_unique_ptr.pass.cpp

@@ -67,10 +67,14 @@ int main()
     int* ptr = new int;
     std::unique_ptr<int> p(ptr);
     std::hash<std::unique_ptr<int> > f;
-    ASSERT_NOT_NOEXCEPT(f(p));
     std::size_t h = f(p);
     assert(h == std::hash<int*>()(ptr));
   }
+  {
+    std::unique_ptr<int, PointerDeleter<int, 1>> pThrowingHash;
+    std::hash<std::unique_ptr<int, PointerDeleter<int, 1>>> fThrowingHash;
+    ASSERT_NOT_NOEXCEPT(fThrowingHash(pThrowingHash));
+  }
 #if TEST_STD_VER >= 11
   {
     test_enabled_with_deleter<int, Deleter<int>>();

libcxx/test/std/utilities/optional/optional.hash/hash.pass.cpp

@@ -37,10 +37,15 @@ int main()
     const std::size_t nullopt_hash =
         std::hash<optional<double>>{}(optional<double>{});
 
+    {
+        optional<B> opt;
+        ASSERT_NOT_NOEXCEPT(std::hash<optional<B>>()(opt));
+        ASSERT_NOT_NOEXCEPT(std::hash<optional<const B>>()(opt));
+    }
+
     {
         typedef int T;
         optional<T> opt;
-        ASSERT_NOT_NOEXCEPT(std::hash<optional<T>>()(opt));
         assert(std::hash<optional<T>>{}(opt) == nullopt_hash);
         opt = 2;
         assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
@@ -48,7 +53,6 @@ int main()
     {
         typedef std::string T;
         optional<T> opt;
-        ASSERT_NOT_NOEXCEPT(std::hash<optional<T>>()(opt));
         assert(std::hash<optional<T>>{}(opt) == nullopt_hash);
         opt = std::string("123");
         assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
@@ -56,7 +60,6 @@ int main()
     {
         typedef std::unique_ptr<int> T;
         optional<T> opt;
-        ASSERT_NOT_NOEXCEPT(std::hash<optional<T>>()(opt));
         assert(std::hash<optional<T>>{}(opt) == nullopt_hash);
         opt = std::unique_ptr<int>(new int(3));
         assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));