compare equal helper for containers

src/FbTk/CompareEqual.hh

@@ -0,0 +1,53 @@
+// CompareEqual.hh
+// Copyright (c) 2004 Henrik Kinnunen (fluxgen at users.sourceforge.net)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+// $Id: CompareEqual.hh,v 1.1 2004/02/27 12:11:05 fluxgen Exp $
+
+#ifndef FBTK_COMPAREEQUAL_HH
+#define FBTK_COMPAREEQUAL_HH
+
+#include <functional>
+namespace FbTk {
+
+/// @brief compares one class function with a value type
+template <typename ClassType, typename ValueType>
+class CompareEqual_base: public std::unary_function<ClassType, bool> {
+public:
+    typedef ValueType (ClassType::* Action)() const;
+    typedef ValueType Value;
+    CompareEqual_base(Action a, ValueType v):m_action(a), m_value(v) { }
+    bool operator ()(const ClassType *instance) const {
+        return (instance->*m_action)() == m_value;
+    }
+private:
+    Action m_action;
+    Value m_value;
+};
+
+// creates an CompareEqual_base object
+template <typename A, typename B>
+inline CompareEqual_base<A, B> 
+CompareEqual(typename CompareEqual_base<A, B>::Action action, B b) {
+    return CompareEqual_base<A, B>(action, b);
+}
+} // end namespace FbTk
+
+#endif // FBTK_COMPAREEQUAL_HH