Diff: api/CallChain.h

Revision:

0:7e2bd16f80af

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/api/CallChain.h	Sat Jan 17 18:03:58 2015 +0000
@@ -0,0 +1,181 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_CALLCHAIN_H
+#define MBED_CALLCHAIN_H
+
+#include "FunctionPointer.h"
+#include <string.h>
+
+namespace mbed {
+
+/** Group one or more functions in an instance of a CallChain, then call them in
+ * sequence using CallChain::call(). Used mostly by the interrupt chaining code,
+ * but can be used for other purposes.
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ *
+ * CallChain chain;
+ *
+ * void first(void) {
+ *     printf("'first' function.\n");
+ * }
+ *
+ * void second(void) {
+ *     printf("'second' function.\n");
+ * }
+ *
+ * class Test {
+ * public:
+ *     void f(void) {
+ *         printf("A::f (class member).\n");
+ *     }
+ * };
+ *
+ * int main() {
+ *     Test test;
+ *
+ *     chain.add(second);
+ *     chain.add_front(first);
+ *     chain.add(&test, &Test::f);
+ *     chain.call();
+ * }
+ * @endcode
+ */
+
+typedef FunctionPointer* pFunctionPointer_t;
+
+class CallChain {
+public:
+    /** Create an empty chain
+     *
+     *  @param size (optional) Initial size of the chain
+     */
+    CallChain(int size = 4);
+    virtual ~CallChain();
+
+    /** Add a function at the end of the chain
+     *
+     *  @param function A pointer to a void function
+     *
+     *  @returns
+     *  The function object created for 'function'
+     */
+    pFunctionPointer_t add(void (*function)(void));
+
+    /** Add a function at the end of the chain
+     *
+     *  @param tptr pointer to the object to call the member function on
+     *  @param mptr pointer to the member function to be called
+     *
+     *  @returns
+     *  The function object created for 'tptr' and 'mptr'
+     */
+    template<typename T>
+    pFunctionPointer_t add(T *tptr, void (T::*mptr)(void)) {
+        return common_add(new FunctionPointer(tptr, mptr));
+    }
+
+    /** Add a function at the beginning of the chain
+     *
+     *  @param function A pointer to a void function
+     *
+     *  @returns
+     *  The function object created for 'function'
+     */
+    pFunctionPointer_t add_front(void (*function)(void));
+
+    /** Add a function at the beginning of the chain
+     *
+     *  @param tptr pointer to the object to call the member function on
+     *  @param mptr pointer to the member function to be called
+     *
+     *  @returns
+     *  The function object created for 'tptr' and 'mptr'
+     */
+    template<typename T>
+    pFunctionPointer_t add_front(T *tptr, void (T::*mptr)(void)) {
+        return common_add_front(new FunctionPointer(tptr, mptr));
+    }
+
+    /** Get the number of functions in the chain
+     */
+    int size() const;
+
+    /** Get a function object from the chain
+     *
+     *  @param i function object index
+     *
+     *  @returns
+     *  The function object at position 'i' in the chain
+     */
+    pFunctionPointer_t get(int i) const;
+
+    /** Look for a function object in the call chain
+     *
+     *  @param f the function object to search
+     *
+     *  @returns
+     *  The index of the function object if found, -1 otherwise.
+     */
+    int find(pFunctionPointer_t f) const;
+
+    /** Clear the call chain (remove all functions in the chain).
+     */
+    void clear();
+
+    /** Remove a function object from the chain
+     *
+     *  @arg f the function object to remove
+     *
+     *  @returns
+     *  true if the function object was found and removed, false otherwise.
+     */
+    bool remove(pFunctionPointer_t f);
+
+    /** Call all the functions in the chain in sequence
+     */
+    void call();
+
+#ifdef MBED_OPERATORS
+    void operator ()(void) {
+        call();
+    }
+    pFunctionPointer_t operator [](int i) const {
+        return get(i);
+    }
+#endif
+
+private:
+    void _check_size();
+    pFunctionPointer_t common_add(pFunctionPointer_t pf);
+    pFunctionPointer_t common_add_front(pFunctionPointer_t pf);
+
+    pFunctionPointer_t* _chain;
+    int _size;
+    int _elements;
+
+    /* disallow copy constructor and assignment operators */
+private:
+    CallChain(const CallChain&);
+    CallChain & operator = (const CallChain&);
+};
+
+} // namespace mbed
+
+#endif
+