boost/uuid/nil_generator.hpp

0001 // Boost nil_generator.hpp header file  ----------------------------------------------//
0002
0003 // Copyright 2010 Andy Tompkins.
0004 // Distributed under the Boost Software License, Version 1.0. (See
0005 // accompanying file LICENSE_1_0.txt or copy at
0006 // https://www.boost.org/LICENSE_1_0.txt)
0007
0008 #ifndef BOOST_UUID_NIL_GENERATOR_HPP
0009 #define BOOST_UUID_NIL_GENERATOR_HPP
0010
0011 #include <boost/uuid/uuid.hpp>
0012
0013 namespace boost {
0014 namespace uuids {
0015
0016 // generate a nil uuid
0017 struct nil_generator {
0018     typedef uuid result_type;
0019
0020     uuid operator()() const {
0021         // initialize to all zeros
0022         uuid u = {{0}};
0023         return u;
0024     }
0025 };
0026
0027 inline uuid nil_uuid() {
0028     return nil_generator()();
0029 }
0030
0031 }} // namespace boost::uuids
0032
0033 #endif // BOOST_UUID_NIL_GENERATOR_HPP
0034