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Thirdparty/Pangolin/include/pangolin/utils/signal_slot.h

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+#pragma once
+
+#include <functional>
+#include <map>
+
+#include <pangolin/utils/registration.h>
+
+namespace pangolin {
+
+// Based on http://simmesimme.github.io/tutorials/2015/09/20/signal-slot
+template <typename... Args>
+class Signal
+{
+public:
+    using Id = size_t;
+    using Reg = Registration<Id>;
+
+    Signal()
+        : current_id_(0)
+    {
+    }
+
+    Signal(const Signal&) = delete;
+
+    Signal(Signal&&) = default;
+
+    // connects a std::function to the signal. The returned
+    // value can be used to disconnect the function again
+    Reg Connect(const std::function<void(Args...)>& slot) const {
+        slots_.insert(std::make_pair(++current_id_, slot));
+        return Reg(current_id_, [this](Id id){ Disconnect(id);});
+    }
+
+    // disconnects a previously connected function
+    void Disconnect(Id id) const {
+        slots_.erase(id);
+    }
+
+    // disconnects all previously connected functions
+    void DisconnectAll() const {
+        slots_.clear();
+    }
+
+    // calls all connected functions
+    void operator()(Args... p) {
+        for(auto it : slots_) {
+            it.second(p...);
+        }
+    }
+
+private:
+    mutable std::map<Id, std::function<void(Args...)>> slots_;
+    mutable Id current_id_;
+};
+
+}