Method acquire

Source/Falcor/Utils/SharedCache.h:54–69

struct SharedCache
{
    std::shared_ptr<T> acquire(Key key, const std::function<std::shared_ptr<T>()>& init)
    {
        std::lock_guard<std::mutex> lock(mutex);
        auto it = cache.find(key);
        if (it != cache.end())
        {
            if (auto data = it->second.lock())
                return data;
            else
                cache.erase(it);
        }

        std::shared_ptr<T> data = init();
        cache.emplace(key, data);
        return data;
    }

    std::mutex mutex;
    std::map<Key, std::weak_ptr<T>> cache;