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Once.hpp
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//
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// $Id: Once.hpp 2043 2010-06-11 19:46:18Z chambm $
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//
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//
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// Original author: Matt Chambers <matt.chambers .@. vanderbilt.edu>
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//
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// Copyright 2010 Vanderbilt University - Nashville, TN 37232
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef _ONCE_HPP_
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#define _ONCE_HPP_
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#include <boost/thread/once.hpp>
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namespace
pwiz {
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namespace
util {
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// since the call_once implementation may be defined as an aggregate,
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// this proxy class can be used for initializing per-instance once_flags
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struct
once_flag_proxy
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{
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boost::once_flag
flag
;
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};
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/// this proxy class can be used for initializing per-instance once_flag_proxy(s)
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static
once_flag_proxy
init_once_flag_proxy
= {BOOST_ONCE_INIT};
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}
// namespace util
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}
// namespace pwiz
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#endif // _ONCE_HPP_
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