Type constrains for pointer related operations implemented.

include/unique_resource.h

@@ -21,6 +21,7 @@
 #pragma once
 
 #include <utility>
+#include <type_traits>
 
 namespace sr
 {
@@ -90,6 +91,21 @@ namespace sr
             return m_resource;
         }
 
+        template<class R = std::decay_t<Ressource>,
+            std::enable_if_t<std::is_pointer<R>::value &&
+                ( std::is_class<std::remove_pointer_t<R>>::value
+                    || std::is_union<std::remove_pointer_t<R>>::value ), int> = 0>
+        R operator->() const noexcept
+        {
+            return m_resource;
+        }
+
+        template<class R = std::decay_t<Ressource>,
+            std::enable_if_t<std::is_pointer<R>::value, int> = 0>
+        std::add_lvalue_reference_t<std::remove_pointer_t<Ressource>> operator*() const noexcept
+        {
+            return *get();
+        }
 
         const Deleter& get_deleter() const noexcept
         {

test/UniqueResourceTest.cpp

@@ -23,6 +23,7 @@
 #include <catch.hpp>
 
 using Handle = int;
+using PtrHandle = std::add_pointer_t<Handle>;
 
 TEST_CASE("deleter called on destruction", "[UniqueResource]")
 {
@@ -249,14 +250,28 @@ TEST_CASE("get accesses ressource", "[UniqueResource]")
     REQUIRE(guard.get() == 3);
 }
 
-TEST_CASE("conversion operator accesses ressource", "[UniqueResource]")
+TEST_CASE("conversion operator", "[UniqueResource]")
 {
     auto guard = sr::unique_resource(Handle{3}, [](auto) { });
     const auto& ref = guard;
     REQUIRE(ref == 3);
 }
 
-// TODO: conditional access functions
+TEST_CASE("pointer access operator" "[UniqueResource]")
+{
+    const auto p = std::make_pair(3, 4);
+    auto guard = sr::unique_resource(&p, [](auto) { });
+    const auto x = guard.operator->();
+    REQUIRE(x->first == 3);
+}
+
+TEST_CASE("dereference operator", "[UniqueResource]")
+{
+    Handle h{4};
+    auto guard = sr::unique_resource(PtrHandle{&h}, [](auto) { });
+    const auto x = guard.operator*();
+    REQUIRE(x == 4);
+}
 
 TEST_CASE("deleter access", "[UniqueResource]")
 {
@@ -265,5 +280,4 @@ TEST_CASE("deleter access", "[UniqueResource]")
     REQUIRE(value == 0);
     guard.get_deleter()(6);
     REQUIRE(value == 6);
-
 }