utils.h

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//
// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_BASE_WORK_UTILS_H
#define PXR_BASE_WORK_UTILS_H
 
 
#include "pxr/pxr.h"
#include "pxr/base/work/api.h"
#include "pxr/base/work/detachedTask.h"
 
#include <utility>
 
PXR_NAMESPACE_OPEN_SCOPE
 
WORK_API
bool Work_ShouldSynchronizeAsyncDestroyCalls();
 
template <class T>
struct Work_AsyncMoveDestroyHelper {
    void operator()() const { /* do nothing */ }
    T obj;
};
 
// Helper for swap-based asynchronous destruction that synthesizes move
// construction and assignment using swap.
template <class T>
struct Work_AsyncSwapDestroyHelper {
    Work_AsyncSwapDestroyHelper() = default;
 
    Work_AsyncSwapDestroyHelper(Work_AsyncSwapDestroyHelper const&) = delete;
    Work_AsyncSwapDestroyHelper& operator=(
        Work_AsyncSwapDestroyHelper const&) = delete;
 
    Work_AsyncSwapDestroyHelper(Work_AsyncSwapDestroyHelper &&other)
        : obj()
    {
        using std::swap;
        swap(obj, other.obj);
    }
 
    Work_AsyncSwapDestroyHelper& operator=(
        Work_AsyncSwapDestroyHelper &&other)
    {
        using std::swap;
        swap(obj, other.obj);
        return *this;
    }
 
    void operator()() const { /* do nothing */ }
    T obj;
};
 
template <class T>
void WorkSwapDestroyAsync(T &obj)
{
    using std::swap;
    Work_AsyncSwapDestroyHelper<T> helper;
    swap(helper.obj, obj);
    if (!Work_ShouldSynchronizeAsyncDestroyCalls())
        WorkRunDetachedTask(std::move(helper));
}
 
template <class T>
void WorkMoveDestroyAsync(T &obj)
{
    Work_AsyncMoveDestroyHelper<T> helper { std::move(obj) };
    if (!Work_ShouldSynchronizeAsyncDestroyCalls())
        WorkRunDetachedTask(std::move(helper));
}
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_BASE_WORK_UTILS_H