libcruft-util/typeidx.cpp

/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Copyright 2017 Danny Robson <danny@nerdcruft.net>
 */

#include "typeidx.hpp"

#include <atomic>

///////////////////////////////////////////////////////////////////////////////
static std::atomic<int> counter;


//-----------------------------------------------------------------------------
int
cruft::detail::typeidx_next ()
{
    // We can't return zero, but we want to optimise access to the static
    // (which means we can't have it locally due to initialisation locking).
    //
    // Ensure we use pre-increment so that we can utilise zero static
    // initialisation instead.
    return ++counter;
}