Diff: mbed-client/test/mbedclient/utest/common/FunctionPointerBase.h

Revision:

0:dbad57390bd1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-client/test/mbedclient/utest/common/FunctionPointerBase.h	Sun May 14 18:37:05 2017 +0000
@@ -0,0 +1,89 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2015 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_FUNCTIONPOINTERBASE_H
+#define MBED_FUNCTIONPOINTERBASE_H
+
+#include <string.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <stdarg.h>
+namespace mbed {
+
+template<typename R>
+class FunctionPointerBase {
+public:
+    operator bool(void) const {
+        return (_membercaller != NULL) && (_object != NULL);
+    }
+
+    /**
+     * Clears the current function pointer assignment
+     * After clear(), this instance will point to nothing (NULL)
+     */
+    virtual void clear() {
+        _membercaller = NULL;
+        _object = NULL;
+    }
+
+protected:
+    struct ArgOps {
+        void (*constructor)(void *, va_list);
+        void (*copy_args)(void *, void *);
+        void (*destructor)(void *);
+    };
+    void * _object; // object Pointer/function pointer
+    R (*_membercaller)(void *, uintptr_t *, void *);
+    // aligned raw member function pointer storage - converted back by registered _membercaller
+    uintptr_t _member[4];
+    static const struct ArgOps _nullops;
+
+protected:
+    FunctionPointerBase():_object(NULL), _membercaller(NULL) {}
+    FunctionPointerBase(const FunctionPointerBase<R> & fp) {
+        copy(&fp);
+    }
+    virtual ~FunctionPointerBase() {
+    }
+
+    /**
+     * Calls the member pointed to by object::member or (function)object
+     * @param arg
+     * @return
+     */
+    inline R call(void* arg) {
+        return _membercaller(_object, _member, arg);
+    }
+
+    void copy(const FunctionPointerBase<R> * fp) {
+        _object = fp->_object;
+        memcpy (_member, fp->_member, sizeof(_member));
+        _membercaller = fp->_membercaller;
+    }
+private:
+    static void _null_constructor(void * dest, va_list args) {(void) dest;(void) args;}
+    static void _null_copy_args(void *dest , void* src) {(void) dest; (void) src;}
+    static void _null_destructor(void *args) {(void) args;}
+
+};
+template<typename R>
+const struct FunctionPointerBase<R>::ArgOps FunctionPointerBase<R>::_nullops = {
+    FunctionPointerBase<R>::_null_constructor,
+    FunctionPointerBase<R>::_null_copy_args,
+    FunctionPointerBase<R>::_null_destructor
+};
+
+}
+#endif