1 files changed, 68 insertions, 0 deletions
diff --git a/src/base/bus.hh b/src/base/bus.hh
new file mode 100644
index 0000000..dea23ac
--- /dev/null
+++ b/src/base/bus.hh
@@ -0,0 +1,68 @@
+/**
+ * Copyright (c) 2022, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef lnav_bus_hh
+#define lnav_bus_hh
+
+#include <vector>
+
+#include "lnav_log.hh"
+
+template<typename T>
+class bus {
+public:
+    bus() = default;
+
+    virtual ~bus() { require(this->b_components.empty()); }
+
+    bus(const bus<T>&) = delete;
+
+    void attach(T* component)
+    {
+        this->b_components.template emplace_back(component);
+    }
+
+    void detach(T* component)
+    {
+        auto iter = this->b_components.begin();
+        for (; iter != this->b_components.end(); ++iter) {
+            if (*iter == component) {
+                break;
+            }
+        }
+        require(iter != this->b_components.end());
+
+        this->b_components.erase(iter);
+    }
+
+protected:
+    std::vector<T*> b_components;
+};
+
+#endif