make it self-assignment safe

[web/konrad/chester.git] / dptr_shared.h

diff --git a/dptr_shared.h b/dptr_shared.h
index b824194..88dc7a4 100644 (file)
--- a/dptr_shared.h
+++ b/dptr_shared.h
@@ -58,5 +58,5 @@ To be used in implementation where the actual d-pointer class is implemented.
  Class::DPrivate::~DPrivate(){d->detach();}\
  Class::DPrivate Class::DPrivate::clone()const{DPrivate r;*(r.d)=*d;return r;}\
  Class::DPrivate& Class::DPrivate::operator=(const DPrivate&dp)\
- {d->detach();d=dp.d;d->attach();return *this;}
+ {if(d!=dp.d){d->detach();d=dp.d;d->attach();}return *this;}