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          Python 2.5 introduces a new Py_ssize_t
          typedef and two related macros (PEP
          353). The <boost/python/ssize_t.hpp> header imports these
          definitions into the boost::python
          namespace as ssize_t,
          ssize_t_max, and ssize_t_min. Appropriate definitions
          are provided for backward compatibility with previous Python versions.
        
          Imports Py_ssize_t into
          the boost::python namespace if available, or provides
          an appropriate typedef for backward compatibility:
        
#if PY_VERSION_HEX >= 0x02050000 typedef Py_ssize_t ssize_t; #else typedef int ssize_t; #endif
          Imports PY_SSIZE_T_MAX
          and PY_SSIZE_T_MIN as constants
          into the boost::python namespace if available, or provides
          appropriate constants for backward compatibility:
        
#if PY_VERSION_HEX >= 0x02050000 ssize_t const ssize_t_max = PY_SSIZE_T_MAX; ssize_t const ssize_t_min = PY_SSIZE_T_MIN; #else ssize_t const ssize_t_max = INT_MAX; ssize_t const ssize_t_min = INT_MIN; #endif