src/mongo/util/intrusive_counter.cpp


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/**
 * Copyright (c) 2011 10gen Inc.
 *
 * This program is free software: you can redistribute it and/or  modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * As a special exception, the copyright holders give permission to link the
 * code of portions of this program with the OpenSSL library under certain
 * conditions as described in each individual source file and distribute
 * linked combinations including the program with the OpenSSL library. You
 * must comply with the GNU Affero General Public License in all respects
 * for all of the code used other than as permitted herein. If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so. If you do not
 * wish to do so, delete this exception statement from your version. If you
 * delete this exception statement from all source files in the program,
 * then also delete it in the license file.
 */

#include "mongo/platform/basic.h"

#include "mongo/util/intrusive_counter.h"

#include "mongo/util/mongoutils/str.h"

namespace mongo {
using boost::intrusive_ptr;
using namespace mongoutils;

intrusive_ptr<const RCString> RCString::create(StringData s) {
    uassert(16493,
            str::stream() << "Tried to create string longer than "
                          << (BSONObjMaxUserSize / 1024 / 1024)
                          << "MB",
            s.size() < static_cast<size_t>(BSONObjMaxUserSize));

    const size_t sizeWithNUL = s.size() + 1;
    const size_t bytesNeeded = sizeof(RCString) + sizeWithNUL;

#pragma warning(push)
#pragma warning(disable : 4291)
    intrusive_ptr<RCString> ptr = new (bytesNeeded) RCString();  // uses custom operator new
#pragma warning(pop)

    ptr->_size = s.size();
    char* stringStart = reinterpret_cast<char*>(ptr.get()) + sizeof(RCString);
    s.copyTo(stringStart, true);

    return ptr;
}

void IntrusiveCounterUnsigned::addRef() const {
    ++counter;
}

void IntrusiveCounterUnsigned::release() const {
    if (!--counter)
        delete this;
}
}