add drop_only tests for arc/rc

Author: cmazakas

libsafecxx/single-header/std2.h

@@ -798,6 +798,10 @@ arc
   T const^ operator->(self const^) noexcept safe {
     return ^*self->p_->data_.get();
   }
+
+  T const^ operator*(self const^) noexcept safe {
+    return ^*self->p_->data_.get();
+  }
 };
 
 ////////////////////////////////////////////////////////////////////////////////

libsafecxx/test/arc_test.cxx

@@ -3,6 +3,44 @@
 #include <std2.h>
 #include "lightweight_test.h"
 
+struct anon_callable/(a, b, c)
+{
+  std2::string_view/c sv_;
+  int^/a x_;
+  int const^/b y_;
+
+  anon_callable(
+    std2::string_view/c sv,
+    int^/a x,
+    int const^/b y) safe
+    : sv_(sv)
+    , x_(x)
+    , y_(y)
+  {
+  }
+
+  [[unsafe::drop_only(a, b)]]
+  ~anon_callable() = default;
+
+  void operator()(self const^) safe
+  {
+    self->sv_;
+    self->x_;
+    self->y_;
+  }
+};
+
+void functor_test() safe
+{
+  std2::string_view sv = "hello, world!"sv2;
+
+  int a = 1234;
+  int const b = 4321;
+
+  anon_callable f(sv, ^a, b);
+  f();
+}
+
 void drop_only() safe
 {
   {
@@ -11,10 +49,10 @@ void drop_only() safe
       std2::string s("hello, world!");
 
       // TODO: re-enable this test once we get pointer variance working
-      // p = std2::arc(s.str());
-      // assert_true(*p == "hello, world!"sv2);
+      p = std2::arc(s.str());
+      REQUIRE_EQ(*p, "hello, world!"sv2);
     }
   }
 }
 
-TEST_MAIN(drop_only)
+TEST_MAIN(functor_test, drop_only)

libsafecxx/test/rc_test.cxx

@@ -37,14 +37,13 @@ void drop_only() safe
       std2::string s("hello, world!");
 
       // TODO: re-enable this test once we get pointer variance working
-      // p = std2::rc(s.str());
-      // REQUIRE(*p == "hello, world!"sv2);
+      p = std2::rc(s.str());
+      REQUIRE(*p == "hello, world!"sv2);
     }
   }
 }
 
-int main() safe
-{
-  rc_constructor();
-  drop_only();
-}
+TEST_MAIN(
+  rc_constructor,
+  drop_only
+)