From 0fb7a0e0b2b9e04ca414b1e47c69cc854c79831b Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 1 Dec 2020 23:20:01 +0800
Subject: ...

---
 include/cru/common/HandlerRegistry.hpp | 86 ++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 include/cru/common/HandlerRegistry.hpp

(limited to 'include/cru/common')

diff --git a/include/cru/common/HandlerRegistry.hpp b/include/cru/common/HandlerRegistry.hpp
new file mode 100644
index 00000000..bd74a9e0
--- /dev/null
+++ b/include/cru/common/HandlerRegistry.hpp
@@ -0,0 +1,86 @@
+#pragma once
+#include "Base.hpp"
+
+#include <algorithm>
+#include <functional>
+#include <utility>
+#include <vector>
+
+namespace cru {
+
+template <typename T>
+class HandlerRegistryIterator {
+ public:
+  using RawIterator =
+      typename std::vector<std::pair<int, std::function<T>>>::const_iterator;
+
+  explicit HandlerRegistryIterator(RawIterator raw) : raw_(std::move(raw)) {}
+
+  CRU_DELETE_COPY(HandlerRegistryIterator)
+  CRU_DELETE_MOVE(HandlerRegistryIterator)
+
+  ~HandlerRegistryIterator() = default;
+
+  const std::function<T>& operator*() const { return raw_->second; }
+  const std::function<T>* operator->() const { return &raw_->second; }
+
+  HandlerRegistryIterator& operator++() {
+    ++raw_;
+    return *this;
+  }
+
+  HandlerRegistryIterator operator++(int) {
+    auto c = *this;
+    this->operator++();
+    return c;
+  }
+
+  bool operator==(const HandlerRegistryIterator<T>& other) const {
+    return this->raw_ == other.raw_;
+  }
+
+  bool operator!=(const HandlerRegistryIterator<T>& other) const {
+    return !this->operator==(other);
+  }
+
+ private:
+  RawIterator raw_;
+};
+
+template <typename T>
+class HandlerRegistry final {
+ public:
+  HandlerRegistry() = default;
+  CRU_DEFAULT_COPY(HandlerRegistry)
+  CRU_DEFAULT_MOVE(HandlerRegistry)
+  ~HandlerRegistry() = default;
+
+ public:
+  int AddHandler(std::function<T> handler) {
+    auto id = current_id_++;
+    handler_list_.push_back({id, std::move(handler)});
+  }
+
+  void RemoveHandler(int id) {
+    auto result = std::find_if(handler_list_.cbegin(), handler_list_.cend(),
+                               [id](const std::pair<int, std::function<T>>& d) {
+                                 return d.first == id;
+                               });
+    if (result != handler_list_.cend()) {
+      handler_list_.erase(result);
+    }
+  }
+
+  HandlerRegistryIterator<T> begin() const {
+    return HandlerRegistryIterator<T>(handler_list_.begin());
+  }
+
+  HandlerRegistryIterator<T> end() const {
+    return HandlerRegistryIterator<T>(handler_list_.begin());
+  }
+
+ private:
+  int current_id_ = 1;
+  std::vector<std::pair<int, std::function<T>>> handler_list_;
+};
+}  // namespace cru
-- 
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