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source/EventQueue/detail/ThunkVTableGenerator.h@0:1c7da5f83647, 2016-11-29 (annotated)

Committer:
sarahmarshy
Date:
Tue Nov 29 06:29:10 2016 +0000
Revision:
0:1c7da5f83647
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sarahmarshy 0:1c7da5f83647 1 /*
sarahmarshy 0:1c7da5f83647 2 * Copyright (c) 2016, ARM Limited, All Rights Reserved
sarahmarshy 0:1c7da5f83647 3 * SPDX-License-Identifier: Apache-2.0
sarahmarshy 0:1c7da5f83647 4 *
sarahmarshy 0:1c7da5f83647 5 * Licensed under the Apache License, Version 2.0 (the "License"); you may
sarahmarshy 0:1c7da5f83647 6 * not use this file except in compliance with the License.
sarahmarshy 0:1c7da5f83647 7 * You may obtain a copy of the License at
sarahmarshy 0:1c7da5f83647 8 *
sarahmarshy 0:1c7da5f83647 9 * http://www.apache.org/licenses/LICENSE-2.0
sarahmarshy 0:1c7da5f83647 10 *
sarahmarshy 0:1c7da5f83647 11 * Unless required by applicable law or agreed to in writing, software
sarahmarshy 0:1c7da5f83647 12 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
sarahmarshy 0:1c7da5f83647 13 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
sarahmarshy 0:1c7da5f83647 14 * See the License for the specific language governing permissions and
sarahmarshy 0:1c7da5f83647 15 * limitations under the License.
sarahmarshy 0:1c7da5f83647 16 */
sarahmarshy 0:1c7da5f83647 17 #ifndef EVENTQUEUE_DETAIL_THUNKVTABLEGENERATOR_H_
sarahmarshy 0:1c7da5f83647 18 #define EVENTQUEUE_DETAIL_THUNKVTABLEGENERATOR_H_
sarahmarshy 0:1c7da5f83647 19
sarahmarshy 0:1c7da5f83647 20 // imported from Thunk.h
sarahmarshy 0:1c7da5f83647 21
sarahmarshy 0:1c7da5f83647 22 namespace eq {
sarahmarshy 0:1c7da5f83647 23 namespace detail {
sarahmarshy 0:1c7da5f83647 24
sarahmarshy 0:1c7da5f83647 25 /**
sarahmarshy 0:1c7da5f83647 26 * Thunk VTable Generator.
sarahmarshy 0:1c7da5f83647 27 * This class generate the vtable of a type F for a Thunk.
sarahmarshy 0:1c7da5f83647 28 * \tparam F The type of the callable for which the Thunk vtable should be
sarahmarshy 0:1c7da5f83647 29 * generated.
sarahmarshy 0:1c7da5f83647 30 */
sarahmarshy 0:1c7da5f83647 31 template<typename F>
sarahmarshy 0:1c7da5f83647 32 struct ThunkVTableGenerator {
sarahmarshy 0:1c7da5f83647 33 typedef Thunk thunk_t;
sarahmarshy 0:1c7da5f83647 34
sarahmarshy 0:1c7da5f83647 35 /**
sarahmarshy 0:1c7da5f83647 36 * Implementation of destructor for Thunk holding an F.
sarahmarshy 0:1c7da5f83647 37 * @param self The thunk to destroy
sarahmarshy 0:1c7da5f83647 38 */
sarahmarshy 0:1c7da5f83647 39 static void destroy(thunk_t& self) {
sarahmarshy 0:1c7da5f83647 40 get_ptr(self)->~F();
sarahmarshy 0:1c7da5f83647 41 }
sarahmarshy 0:1c7da5f83647 42
sarahmarshy 0:1c7da5f83647 43 /**
sarahmarshy 0:1c7da5f83647 44 * Implementation of copy (used by copy constructor and copy assignment)
sarahmarshy 0:1c7da5f83647 45 * for a Thunk holding an F.
sarahmarshy 0:1c7da5f83647 46 * @param dest The thunk receiving the copy.
sarahmarshy 0:1c7da5f83647 47 * @param self The thunk to copy.
sarahmarshy 0:1c7da5f83647 48 */
sarahmarshy 0:1c7da5f83647 49 static void copy(thunk_t& dest, const thunk_t& self) {
sarahmarshy 0:1c7da5f83647 50 new (get_ptr(dest)) F(*get_ptr(self));
sarahmarshy 0:1c7da5f83647 51 dest._vtable = self._vtable;
sarahmarshy 0:1c7da5f83647 52 }
sarahmarshy 0:1c7da5f83647 53
sarahmarshy 0:1c7da5f83647 54 /**
sarahmarshy 0:1c7da5f83647 55 * Implementation of call operator for a Thunk holding an F.
sarahmarshy 0:1c7da5f83647 56 * @param self The thunk containing the F to call.
sarahmarshy 0:1c7da5f83647 57 */
sarahmarshy 0:1c7da5f83647 58 static void call(const thunk_t& self) {
sarahmarshy 0:1c7da5f83647 59 (*get_ptr(self))();
sarahmarshy 0:1c7da5f83647 60 }
sarahmarshy 0:1c7da5f83647 61
sarahmarshy 0:1c7da5f83647 62 /**
sarahmarshy 0:1c7da5f83647 63 * The Thunk vtable for an F.
sarahmarshy 0:1c7da5f83647 64 */
sarahmarshy 0:1c7da5f83647 65 static const ThunkVTable vtable;
sarahmarshy 0:1c7da5f83647 66
sarahmarshy 0:1c7da5f83647 67 private:
sarahmarshy 0:1c7da5f83647 68 /**
sarahmarshy 0:1c7da5f83647 69 * Accessor to the pointer to F contained in the Thunk.
sarahmarshy 0:1c7da5f83647 70 */
sarahmarshy 0:1c7da5f83647 71 static F* get_ptr(thunk_t& thunk) {
sarahmarshy 0:1c7da5f83647 72 return static_cast<F*>(thunk._storage.get_storage(0));
sarahmarshy 0:1c7da5f83647 73 }
sarahmarshy 0:1c7da5f83647 74
sarahmarshy 0:1c7da5f83647 75 /**
sarahmarshy 0:1c7da5f83647 76 * Accessor to the const pointer to F contained in the const Thunk.
sarahmarshy 0:1c7da5f83647 77 */
sarahmarshy 0:1c7da5f83647 78 static const F* get_ptr(const thunk_t& thunk) {
sarahmarshy 0:1c7da5f83647 79 return static_cast<const F*>(thunk._storage.get_storage(0));
sarahmarshy 0:1c7da5f83647 80 }
sarahmarshy 0:1c7da5f83647 81 };
sarahmarshy 0:1c7da5f83647 82
sarahmarshy 0:1c7da5f83647 83 /**
sarahmarshy 0:1c7da5f83647 84 * Instantiation of the Thunk vtable of F.
sarahmarshy 0:1c7da5f83647 85 */
sarahmarshy 0:1c7da5f83647 86 template<typename F>
sarahmarshy 0:1c7da5f83647 87 const ThunkVTable ThunkVTableGenerator<F>::vtable = {
sarahmarshy 0:1c7da5f83647 88 ThunkVTableGenerator<F>::destroy,
sarahmarshy 0:1c7da5f83647 89 ThunkVTableGenerator<F>::copy,
sarahmarshy 0:1c7da5f83647 90 ThunkVTableGenerator<F>::call
sarahmarshy 0:1c7da5f83647 91 };
sarahmarshy 0:1c7da5f83647 92
sarahmarshy 0:1c7da5f83647 93 } // namespace detail
sarahmarshy 0:1c7da5f83647 94 } // namespace eq
sarahmarshy 0:1c7da5f83647 95
sarahmarshy 0:1c7da5f83647 96 #endif /* EVENTQUEUE_DETAIL_THUNKVTABLEGENERATOR_H_ */