OctoPrint WIP: Fix build

src/libslic3r/Channel.hpp

@@ -0,0 +1,104 @@
+#ifndef slic3r_Channel_hpp_
+#define slic3r_Channel_hpp_
+
+#include <deque>
+#include <condition_variable>
+#include <mutex>
+#include <utility>
+#include <boost/optional.hpp>
+
+
+namespace Slic3r {
+
+
+template<class T> class Channel
+{
+private:
+    using UniqueLock = std::unique_lock<std::mutex>;
+    using Queue = std::deque<T>;
+public:
+    class Guard
+    {
+    public:
+        Guard(UniqueLock lock, const Queue &queue) : m_lock(std::move(lock)), m_queue(queue) {}
+        Guard(const Guard &other) = delete;
+        Guard(Guard &&other) = delete;
+        ~Guard() {}
+
+        // Access trampolines
+        size_t size() const noexcept { return m_queue.size(); }
+        bool empty() const noexcept { return m_queue.empty(); }
+        typename Queue::const_iterator begin() const noexcept { return m_queue.begin(); }
+        typename Queue::const_iterator end() const noexcept { return m_queue.end(); }
+        typename Queue::const_reference operator[](size_t i) const { return m_queue[i]; }
+
+        Guard& operator=(const Guard &other) = delete;
+        Guard& operator=(Guard &&other) = delete;
+    private:
+        UniqueLock m_lock;
+        const Queue &m_queue;
+    };
+
+
+    Channel() {}
+    ~Channel() {}
+
+    void push(const T& item, bool silent = false)
+    {
+        {
+            UniqueLock lock(m_mutex);
+            m_queue.push_back(item);
+        }
+        if (! silent) { m_condition.notify_one(); }
+    }
+
+    void push(T &&item, bool silent = false)
+    {
+        {
+            UniqueLock lock(m_mutex);
+            m_queue.push_back(std::forward(item));
+        }
+        if (! silent) { m_condition.notify_one(); }
+    }
+
+    T pop()
+    {
+        UniqueLock lock(m_mutex);
+        m_condition.wait(lock, [this]() { return !m_queue.empty(); });
+        auto item = std::move(m_queue.front());
+        m_queue.pop_front();
+        return item;
+    }
+
+    boost::optional<T> try_pop()
+    {
+        UniqueLock lock(m_mutex);
+        if (m_queue.empty()) {
+            return boost::none;
+        } else {
+            auto item = std::move(m_queue.front());
+            m_queue.pop();
+            return item;
+        }
+    }
+
+    // Unlocked observers
+    // Thread unsafe! Keep in mind you need to re-verify the result after acquiring lock!
+    size_t size() const noexcept { return m_queue.size(); }
+    bool empty() const noexcept { return m_queue.empty(); }
+
+    Guard read() const
+    {
+        return Guard(UniqueLock(m_mutex), m_queue);
+    }
+
+private:
+    Queue m_queue;
+    std::mutex m_mutex;
+    std::condition_variable m_condition;
+};
+
+
+} // namespace Slic3r
+
+#endif // slic3r_Channel_hpp_