memory/deleter: add trivial test case

Makefile.am

@@ -428,6 +428,7 @@ TEST_BIN = 			\
     test/json_types		\
     test/memory/buffer/circular \
     test/memory/buffer/paged	\
+    test/memory/deleter		\
     test/maths			\
     test/matrix			\
     test/md2			\

test/memory/deleter.cpp

@@ -0,0 +1,50 @@
+#include "memory/deleter.hpp"
+#include "tap.hpp"
+
+#include <memory>
+
+
+struct setter {
+    setter (bool &_flag):
+        flag (_flag)
+    { ; }
+
+    void release (unsigned *)
+    { flag = true; }
+
+    bool &flag;
+};
+
+
+int
+main (void)
+{
+    bool flag = false;
+
+    {
+        // setup a pretend resource. we're not going to delete it, it's just
+        // to satisfy some required parameters. importantly it can't be null
+        // otherwise release is skipped.
+        unsigned *foo = reinterpret_cast<unsigned*> (0x01);
+
+        // setup the owner who will set a flag when the release operation is
+        // called
+        setter bar (flag);
+
+        // setup our non-default unique_ptr
+        std::unique_ptr<
+            unsigned,
+            util::memory::owner_deleter<
+                unsigned,
+                setter,
+                &setter::release
+            >
+        > qux (foo, bar);
+    }
+
+    // the flag should have been implicitly set to true via the unique_ptr
+    // callback above
+    util::TAP::logger tap;
+    tap.expect (flag, "owner_deleter calls registered callback");
+    return tap.status ();
+}