#include <db_cxx.h> int DbTxn::set_commit_token(DB_TXN_TOKEN *buffer);
        The DbTxn::set_commit_token() method
        configures the transaction for commit token generation, and accepts
        the address of an application-supplied buffer to receive the token.
        The actual generation of the token contents does not occur until
        commit time.
    
Commit tokens are used to enable some consistency guarantees for replicated applications. Please see the Read your writes consistency section in the Berkeley DB Programmer's Reference Guide for more information.
        The DbTxn::set_commit_token() method may be 
        called at any time after the 
        DbEnv::txn_begin()
        method has been called, and before
        DbTxn::commit()
        has been called.
    
        The DbTxn::set_commit_token() 
            
            
                method either returns a non-zero error value or throws an
                exception that encapsulates a non-zero error value on
                failure, and returns 0 on success.
            
        
    
             The DbTxn::set_commit_token() 
            
            
                method may fail and throw a DbException 
                exception, encapsulating one of the following non-zero errors, or return one
                of the following non-zero errors: