make all d-pointer * const pointers

Doing this disables the implicit copy assignment operator (among others)
which would cause hovac if used on the classes as it would just copy the
pointer, not the data the d-pointer points to. For most of the classes
we don't need a copy assignment operator anyway and in many classes it
was broken before as many contain a pointer of some sort.

Only for our Cacheset Container interfaces we define an explicit copy
assignment operator which could later be implemented to copy the data
from one d-pointer to the other if we need it.

Git-Dch: Ignore

1 files changed, 2 insertions, 2 deletions

diff --git a/apt-pkg/policy.h b/apt-pkg/policy.h
index 0d2b468bc..58b062a7b 100644
--- a/apt-pkg/policy.h
+++ b/apt-pkg/policy.h
@@ -88,8 +88,8 @@ class pkgPolicy : public pkgDepCache::Policy
    explicit pkgPolicy(pkgCache *Owner);
    virtual ~pkgPolicy();
    private:
-   pkgCache::VerIterator GetCandidateVerNew(pkgCache::PkgIterator const &Pkg);
-   void *d;
+   APT_HIDDEN pkgCache::VerIterator GetCandidateVerNew(pkgCache::PkgIterator const &Pkg);
+   void * const d;
 };
 
 bool ReadPinFile(pkgPolicy &Plcy, std::string File = "");