Validate cow_wrapper static default pattern.

A bunch of objects use the optimization to assign one single,
unique default object to default-ctored instances, and decide
on whether any given object is in 'default' state by ptr-comparing
against this one unique instance. Simulating that pattern here.

Change-Id: I88f7d8488d81bcf1a01ab6b63121e003b8f0ade9

1 files changed, 50 insertions, 0 deletions

diff --git a/o3tl/qa/cow_wrapper_clients.cxx b/o3tl/qa/cow_wrapper_clients.cxx
index f468d4306bcf..bfb53f22a9bd 100644
--- a/o3tl/qa/cow_wrapper_clients.cxx
+++ b/o3tl/qa/cow_wrapper_clients.cxx
@@ -18,6 +18,7 @@
  */
 
 #include "cow_wrapper_clients.hxx"
+#include <rtl/instance.hxx>
 
 namespace o3tltests {
 
@@ -169,6 +170,55 @@ bool cow_wrapper_client3::operator<( const cow_wrapper_client3& rRHS ) const
     return maImpl < rRHS.maImpl;
 }
 
+// ---------------------------------------------------------------------------
+
+namespace { struct theDefaultClient4 : public rtl::Static< o3tl::cow_wrapper< int >,
+                                                            theDefaultClient4 > {}; }
+
+cow_wrapper_client4::cow_wrapper_client4() :
+    maImpl(theDefaultClient4::get())
+{
+}
+
+cow_wrapper_client4::cow_wrapper_client4( int nVal ) :
+    maImpl( nVal )
+{
+}
+
+cow_wrapper_client4::~cow_wrapper_client4()
+{
+}
+
+cow_wrapper_client4::cow_wrapper_client4( const cow_wrapper_client4& rSrc ) :
+    maImpl(rSrc.maImpl)
+{
+}
+
+cow_wrapper_client4& cow_wrapper_client4::operator=( const cow_wrapper_client4& rSrc )
+{
+    maImpl = rSrc.maImpl;
+
+    return *this;
+}
+
+bool cow_wrapper_client4::is_default() const
+{
+    return maImpl.same_object(theDefaultClient4::get());
+}
+
+bool cow_wrapper_client4::operator==( const cow_wrapper_client4& rRHS ) const
+{
+    return maImpl == rRHS.maImpl;
+}
+bool cow_wrapper_client4::operator!=( const cow_wrapper_client4& rRHS ) const
+{
+    return maImpl != rRHS.maImpl;
+}
+bool cow_wrapper_client4::operator<( const cow_wrapper_client4& rRHS ) const
+{
+    return maImpl < rRHS.maImpl;
+}
+
 } // namespace o3tltests
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */