mirror of https://github.com/ARMmbed/mbed-os.git
90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2015 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBED_FUNCTIONPOINTERBASE_H
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#define MBED_FUNCTIONPOINTERBASE_H
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#include <string.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdarg.h>
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namespace mbed {
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template<typename R>
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class FunctionPointerBase {
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public:
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operator bool(void) const {
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return (_membercaller != NULL) && (_object != NULL);
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}
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/**
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* Clears the current function pointer assignment
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* After clear(), this instance will point to nothing (NULL)
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*/
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virtual void clear() {
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_membercaller = NULL;
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_object = NULL;
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}
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protected:
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struct ArgOps {
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void (*constructor)(void *, va_list);
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void (*copy_args)(void *, void *);
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void (*destructor)(void *);
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};
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void * _object; // object Pointer/function pointer
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R (*_membercaller)(void *, uintptr_t *, void *);
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// aligned raw member function pointer storage - converted back by registered _membercaller
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uintptr_t _member[4];
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static const struct ArgOps _nullops;
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protected:
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FunctionPointerBase():_object(NULL), _membercaller(NULL) {}
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FunctionPointerBase(const FunctionPointerBase<R> & fp) {
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copy(&fp);
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}
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virtual ~FunctionPointerBase() {
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}
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/**
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* Calls the member pointed to by object::member or (function)object
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* @param arg
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* @return
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*/
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inline R call(void* arg) {
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return _membercaller(_object, _member, arg);
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}
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void copy(const FunctionPointerBase<R> * fp) {
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_object = fp->_object;
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memcpy (_member, fp->_member, sizeof(_member));
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_membercaller = fp->_membercaller;
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}
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private:
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static void _null_constructor(void * dest, va_list args) {(void) dest;(void) args;}
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static void _null_copy_args(void *dest , void* src) {(void) dest; (void) src;}
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static void _null_destructor(void *args) {(void) args;}
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};
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template<typename R>
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const struct FunctionPointerBase<R>::ArgOps FunctionPointerBase<R>::_nullops = {
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FunctionPointerBase<R>::_null_constructor,
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FunctionPointerBase<R>::_null_copy_args,
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FunctionPointerBase<R>::_null_destructor
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};
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}
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#endif
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