Checked unique resource implemented.

include/unique_resource.h

         return unique_resource_t<Ressource, Deleter>{std::move(res), std::move(d), true};
     }
 
+    template<class Ressource, class Deleter>
+    unique_resource_t<Ressource, Deleter> unique_resource_checked(Ressource res, Ressource invalid, Deleter d) noexcept
+    {
+        return unique_resource_t<Ressource, Deleter>{std::move(res), std::move(d), (res != invalid)};
+    }
+
 }
 
 

test/UniqueResourceTest.cpp

     REQUIRE(calls == 0);
 }
 
+TEST_CASE("deleter not called if checked valid", "[UniqueResource]")
+{
+    std::size_t calls{0};
+
+    {
+        auto guard = sr::unique_resource_checked(Handle{3}, Handle{6}, [&calls](auto) { ++calls; });
+        static_cast<void>(guard);
+    }
+
+    REQUIRE(calls == 1);
+}
+
+TEST_CASE("deleter not called if checked invalid", "[UniqueResource]")
+{
+    std::size_t calls{0};
+
+    {
+        auto guard = sr::unique_resource_checked(Handle{3}, Handle{3}, [&calls](auto) { ++calls; });
+        static_cast<void>(guard);
+    }
+
+    REQUIRE(calls == 0);
+}
+
 TEST_CASE("release returns reference to resource", "[UniqueResource]")
 {
     auto guard = sr::unique_resource(Handle{3}, [](auto) { });