Versioning
========================================

As of Botan 2.0.0, Botan uses semantic versioning. So in a future
release, if even a small feature is added, the minor number will
increase and the next release will be 2.1.0. If an incompatible API
change is required, the major version will be increased.

The library has functions for checking compile-time and runtime
versions.

All versions are of the tuple (major,minor,patch). Even minor versions
indicate stable releases while odd minor versions indicate a
development release.

The compile time version information is defined in `botan/build.h`

.. c:macro:: BOTAN_VERSION_MAJOR

   The major version of the release.

.. c:macro:: BOTAN_VERSION_MINOR

   The minor version of the release.

.. c:macro:: BOTAN_VERSION_PATCH

   The patch version of the release.

.. c:macro:: BOTAN_VERSION_DATESTAMP

   Expands to an integer of the form YYYYMMDD if this is an official
   release, or 0 otherwise. For instance, 1.10.1, which was released
   on July 11, 2011, has a `BOTAN_VERSION_DATESTAMP` of 20110711.

.. c:macro:: BOTAN_DISTRIBUTION_INFO

   .. versionadded:: 1.9.3

   A macro expanding to a string that is set at build time using the
   ``--distribution-info`` option. It allows a packager of the library
   to specify any distribution-specific patches. If no value is given
   at build time, the value is 'unspecified'.

.. c:macro:: BOTAN_VERSION_VC_REVISION

   .. versionadded:: 1.10.1

   A macro expanding to a string that is set to a revision identifier
   cooresponding to the source, or 'unknown' if this could not be
   determined. It is set for all official releases and for builds that
   originated from within a Monotone workspace.

The runtime version information, and some helpers for compile time
version checks, are included in `botan/version.h`

.. cpp:function:: std::string version_string()

   Returns a single-line string containing relevant information about
   this build and version of the library in an unspecified format.

.. cpp:function:: u32bit version_major()

   Returns the major part of the version.

.. cpp:function:: u32bit version_minor()

   Returns the minor part of the version.

.. cpp:function:: u32bit version_patch()

   Returns the patch part of the version.

.. cpp:function:: u32bit version_datestamp()

   Return the datestamp of the release (or 0 if the current version is
   not an official release).

.. c:macro:: BOTAN_VERSION_CODE_FOR(maj,min,patch)

   Return a value that can be used to compare versions. The current
   (compile-time) version is available as the macro
   `BOTAN_VERSION_CODE`. For instance, to choose one code path for
   versions before 1.10 and another for 1.10 or later::

      #if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,10,0)
         // 1.10 code path
      #else
         // pre-1.10 code path
      #endif