From ec688b4723a041044226358bcd4dd6e2da39da49 Mon Sep 17 00:00:00 2001 From: Luca Muscariello Date: Thu, 23 Feb 2017 17:01:02 +0100 Subject: Initial commit: cframework. Longbow and Libparc Change-Id: I90378dbd30da6033b20fb1f829b3b822cf366c59 Signed-off-by: Luca Muscariello --- libparc/parc/algol/parc_CMacro.h | 49 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 libparc/parc/algol/parc_CMacro.h (limited to 'libparc/parc/algol/parc_CMacro.h') diff --git a/libparc/parc/algol/parc_CMacro.h b/libparc/parc/algol/parc_CMacro.h new file mode 100644 index 00000000..a47129ea --- /dev/null +++ b/libparc/parc/algol/parc_CMacro.h @@ -0,0 +1,49 @@ +/* + * Copyright (c) 2017 Cisco and/or its affiliates. + * 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. + */ + +/** + * @file parc_CMacro.h + * @ingroup Macro + * @brief Utility C-Macros + * + * CMacro contains a set of utility macros for doing complicated macro processing + * + */ +#ifndef libparc_parc_CMacro_h +#define libparc_parc_CMacro_h + +/** + * parcCMacro_ThridParam expands to the "3rd" input parameter whatever that may be. It is a part + * of the c-macro trick for implement a macro If-Else switch. If the first argument expands + * to a comma then this macro expands to the second parameter, otherwise it expands to the 3rd parameter. + */ +#define parcCMacro_ThirdParam(A, B, C, ...) C + +/** + * parcCMacro_IfElse is a c-macro trick for implementing a macro If-Else switch. + * It uses parcCMacro_ThirdParam to select between A or B depending on whether __VA_ARGS__ expands to a comma. + */ +#define parcCMacro_IfElse(A, B, ...) parcCMacro_ThirdParam(__VA_ARGS__, A, B, NOOP) + +/** \cond */ +#define _parcCMacro_Cat_(A, B) A ## B +/** \endcond */ + +/** + * parcCMacro_Cat combines two strings into a single token. + */ +#define parcCMacro_Cat(A, B) _parcCMacro_Cat_(A, B) + +#endif //libparc_parc_CMacro_h -- cgit