premiere-libtorrent/include/libtorrent/invariant_check.hpp

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// Copyright Daniel Wallin 2004. Use, modification and distribution is
// subject to the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef TORRENT_INVARIANT_ACCESS_HPP_INCLUDED
#define TORRENT_INVARIANT_ACCESS_HPP_INCLUDED
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#include "libtorrent/config.hpp"
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#include "libtorrent/assert.hpp"
#include <cstdio>
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#if TORRENT_USE_INVARIANT_CHECKS
namespace libtorrent {
class invariant_access
{
public:
template<class T>
static void check_invariant(T const& self)
{
self.check_invariant();
}
};
template<class T>
void check_invariant(T const& x)
{
#ifndef BOOST_NO_EXCEPTIONS
try
{
invariant_access::check_invariant(x);
}
catch (std::exception const& err)
{
std::fprintf(stderr, "invariant_check failed with exception: %s\n"
, err.what());
}
catch (...)
{
std::fprintf(stderr, "invariant_check failed with exception\n");
}
#else
invariant_access::check_invariant(x);
#endif
}
struct invariant_checker {};
template<class T>
struct invariant_checker_impl : invariant_checker
{
explicit invariant_checker_impl(T const& self_)
: self(self_)
{
check_invariant(self);
}
invariant_checker_impl(invariant_checker_impl const& rhs)
: self(rhs.self) {}
~invariant_checker_impl()
{
check_invariant(self);
}
T const& self;
private:
invariant_checker_impl& operator=(invariant_checker_impl const&);
};
template<class T>
invariant_checker_impl<T> make_invariant_checker(T const& x)
{
return invariant_checker_impl<T>(x);
}
}
#define INVARIANT_CHECK \
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invariant_checker const& _invariant_check = make_invariant_checker(*this); \
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(void)_invariant_check
#else
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#define INVARIANT_CHECK do {} TORRENT_WHILE_0
#endif
#endif // TORRENT_INVARIANT_ACCESS_HPP_INCLUDED