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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/boost/libs/serialization/example/demo_auto_ptr.cpp | |
parent | Initial commit. (diff) | |
download | ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.tar.xz ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/boost/libs/serialization/example/demo_auto_ptr.cpp')
-rw-r--r-- | src/boost/libs/serialization/example/demo_auto_ptr.cpp | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/src/boost/libs/serialization/example/demo_auto_ptr.cpp b/src/boost/libs/serialization/example/demo_auto_ptr.cpp new file mode 100644 index 000000000..ff86ac413 --- /dev/null +++ b/src/boost/libs/serialization/example/demo_auto_ptr.cpp @@ -0,0 +1,135 @@ +/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 +// demo_auto_ptr.cpp + +// (C) Copyright 2002-4 Robert Ramey - http://www.rrsd.com . +// 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) + +#include <list> +#include <memory> +#include <fstream> +#include <string> + +#include <cstdio> // remove, std::autoptr inteface wrong in dinkumware +#include <boost/config.hpp> +#if defined(BOOST_NO_STDC_NAMESPACE) +namespace std{ + using ::remove; +} +#endif + +#include <boost/archive/tmpdir.hpp> +#include <boost/archive/text_oarchive.hpp> +#include <boost/archive/text_iarchive.hpp> + +#include <boost/serialization/split_free.hpp> + +namespace boost { +namespace serialization { + +///////////////////////////////////////////////////////////// +// implement serialization for auto_ptr< T > +// note: this must be added to the boost namespace in order to +// be called by the library +template<class Archive, class T> +inline void save( + Archive & ar, + const std::auto_ptr< T > &t, + const unsigned int file_version +){ + // only the raw pointer has to be saved + // the ref count is rebuilt automatically on load + const T * const tx = t.get(); + ar << tx; +} + +template<class Archive, class T> +inline void load( + Archive & ar, + std::auto_ptr< T > &t, + const unsigned int file_version +){ + T *pTarget; + ar >> pTarget; + // note that the reset automagically maintains the reference count + #if BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1) + t.release(); + t = std::auto_ptr< T >(pTarget); + #else + t.reset(pTarget); + #endif +} + +// split non-intrusive serialization function member into separate +// non intrusive save/load member functions +template<class Archive, class T> +inline void serialize( + Archive & ar, + std::auto_ptr< T > &t, + const unsigned int file_version +){ + boost::serialization::split_free(ar, t, file_version); +} + +} // namespace serialization +} // namespace boost + +///////////////////////////////////////////////////////////// +// test auto_ptr serialization +class A +{ +private: + friend class boost::serialization::access; + int x; + template<class Archive> + void serialize(Archive &ar, const unsigned int /* file_version */){ + ar & x; + } +public: + A(){} // default constructor + ~A(){} // default destructor +}; + +void save(const std::auto_ptr<A> & spa, const char *filename) +{ + std::ofstream ofs(filename); + boost::archive::text_oarchive oa(ofs); + oa << spa; +} + +void load(std::auto_ptr<A> & spa, const char *filename) +{ + // open the archive + std::ifstream ifs(filename); + boost::archive::text_iarchive ia(ifs); + + // restore the schedule from the archive + ia >> spa; +} + +int main(int argc, char *argv[]) +{ + std::string filename = boost::archive::tmpdir(); + filename += "/testfile"; + + // create a new auto pointer to ta new object of type A + std::auto_ptr<A> spa(new A); + // serialize it + save(spa, filename.c_str()); + // reset the auto pointer to NULL + // thereby destroying the object of type A + // note that the reset automagically maintains the reference count + #if BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1) + spa.release(); + #else + spa.reset(); + #endif + // restore state to one equivalent to the original + // creating a new type A object + load(spa, filename.c_str()); + // obj of type A gets destroyed + // as auto_ptr goes out of scope + std::remove(filename.c_str()); + return 0; +} |