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botan_pipe_cache.hh
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botan_pipe_cache.hh
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#ifndef __BOTAN_PIPE_CACHE_HH__
#define __BOTAN_PIPE_CACHE_HH__
// Copyright (C) 2008 Zack Weinberg <[email protected]>
//
// This program is made available under the GNU GPL version 2.0 or
// greater. See the accompanying file COPYING for details.
//
// This program is distributed WITHOUT ANY WARRANTY; without even the
// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
// PURPOSE.
#include <botan/pipe.h>
#include <boost/scoped_ptr.hpp>
#include "sanity.hh"
// This file defines a simple lifetime-of-the-program caching strategy for
// Botan::Pipe objects. Instead of writing
//
// Botan::Pipe p(...);
//
// you do
//
// static cached_botan_pipe p(new Botan::Pipe(...));
//
// and then use p like a Botan::Pipe object (except with -> instead of .).
//
// The global pipe_cache_cleanup object takes care of destroying all such
// cached pipes before the Botan::LibraryInitializer object is destroyed.
class pipe_cache_cleanup;
class cached_botan_pipe
{
friend class pipe_cache_cleanup;
cached_botan_pipe * next_tbd;
boost::scoped_ptr<Botan::Pipe> pipe;
public:
cached_botan_pipe(Botan::Pipe * p);
~cached_botan_pipe() { I(!pipe); }
Botan::Pipe & operator*()
{ I(pipe); return *pipe; }
Botan::Pipe * operator->()
{ I(pipe); return pipe.get(); }
// ??? operator bool, operator! a la boost::scoped_ptr
// (what's with the bizarro unspecified_bool_type thing?)
};
extern Botan::Pipe * unfiltered_pipe;
extern pipe_cache_cleanup * global_pipe_cleanup_object;
class pipe_cache_cleanup
{
friend class cached_botan_pipe;
struct cached_botan_pipe * to_be_destroyed;
public:
pipe_cache_cleanup() : to_be_destroyed(0)
{
I(!global_pipe_cleanup_object);
global_pipe_cleanup_object = this;
}
~pipe_cache_cleanup()
{
for (cached_botan_pipe * p = to_be_destroyed; p; p = p->next_tbd)
p->pipe.reset(0);
global_pipe_cleanup_object = 0;
}
};
// must be defined after class pipe_cache_cleanup
inline cached_botan_pipe::cached_botan_pipe(Botan::Pipe * p)
: pipe(p)
{
I(global_pipe_cleanup_object);
this->next_tbd = global_pipe_cleanup_object->to_be_destroyed;
global_pipe_cleanup_object->to_be_destroyed = this;
}
// Local Variables:
// mode: C++
// fill-column: 76
// c-file-style: "gnu"
// indent-tabs-mode: nil
// End:
// vim: et:sw=2:sts=2:ts=2:cino=>2s,{s,\:s,+s,t0,g0,^-2,e-2,n-2,p2s,(0,=s:
#endif // __BOTAN_PIPE_CACHE_HH__