Moving delegate to poly.

src/poly/delegate.h

@@ -0,0 +1,50 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef POLY_DELEGATE_H_
+#define POLY_DELEGATE_H_
+
+#include <functional>
+#include <mutex>
+#include <vector>
+
+namespace poly {
+
+// TODO(benvanik): go lockfree, and don't hold the lock while emitting.
+
+template <typename... Args>
+class Delegate {
+ public:
+  typedef std::function<void(Args&...)> Listener;
+
+  void AddListener(Listener const& listener) {
+    std::lock_guard<std::mutex> guard(lock_);
+    listeners_.push_back(listener);
+  }
+
+  void RemoveAllListeners() {
+    std::lock_guard<std::mutex> guard(lock_);
+    listeners_.clear();
+  }
+
+  void operator()(Args&... args) {
+    std::lock_guard<std::mutex> guard(lock_);
+    for (auto& listener : listeners_) {
+      listener(args...);
+    }
+  }
+
+ private:
+  std::mutex lock_;
+  std::vector<Listener> listeners_;
+};
+
+}  // namespace poly
+
+#endif  // POLY_DELEGATE_H_

src/poly/sources.gypi

@@ -5,6 +5,7 @@
     'atomic.h',
     'byte_order.h',
     'debugging.h',
+    'delegate.h',
     'config.h',
     'cxx_compat.h',
     'logging.cc',