ngtcp2_select_version
=====================

Synopsis
--------

*#include <ngtcp2/ngtcp2.h>*

.. function:: uint32_t ngtcp2_select_version(const uint32_t *preferred_versions, size_t preferred_versionslen, const uint32_t *offered_versions, size_t offered_versionslen)

    
    `ngtcp2_select_version` selects and returns a version from the
    version set *offered_versions* of *offered_versionslen* elements.
    *preferred_versions* of *preferred_versionslen* elements specifies
    the preference of versions, which is sorted in the order of
    preference.  All versions included in *preferred_versions* must be
    supported by the library, that is, passing any version in the array
    to `ngtcp2_is_supported_version` must return nonzero.  This
    function is intended to be used by client when it receives Version
    Negotiation packet.  If no version is selected, this function
    returns 0.