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mbed_preprocessor.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2006-2019 ARM Limited
3  * SPDX-License-Identifier: Apache-2.0
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 #ifndef MBED_PREPROCESSOR_H
18 #define MBED_PREPROCESSOR_H
19 
20 /** \addtogroup platform-public-api */
21 /** @{*/
22 
23 /**
24  * \defgroup platform_preprocessor preprocessor macros
25  * @{
26  */
27 
28 /** MBED_CONCAT
29  * Concatenate tokens together
30  *
31  * @note
32  * Expands tokens before concatenation
33  *
34  * @code
35  * // Creates a unique label based on the line number
36  * int MBED_CONCAT(UNIQUE_LABEL_, __LINE__) = 1;
37  * @endcode
38  */
39 #define MBED_CONCAT(a, b) MBED_CONCAT_(a, b)
40 #define MBED_CONCAT_(a, b) a##b
41 
42 /** MBED_STRINGIFY
43  * Converts tokens into strings
44  *
45  * @note
46  * Expands tokens before stringification
47  *
48  * @code
49  * // Creates a string based on the parameters
50  * const char *c = MBED_STRINGIFY(This is a ridiculous way to create a string)
51  * @endcode
52  */
53 #define MBED_STRINGIFY(a) MBED_STRINGIFY_(a)
54 #define MBED_STRINGIFY_(a) #a
55 
56 /** MBED_STRLEN
57  * Reports string token length
58  *
59  * @note
60  * Expands tokens before calculating length
61  *
62  * @code
63  * // Get string length
64  * const int len = MBED_STRLEN("Get the length")
65  * @endcode
66  */
67 #define MBED_STRLEN(a) MBED_STRLEN_(a)
68 #define MBED_STRLEN_(a) (sizeof(a) - 1)
69 
70 /** MBED_COUNT_VA_ARGS(...)
71  * Reports number of tokens passed
72  *
73  * @note
74  * Token limit is 16
75  *
76  * @code
77  * // Get number of arguments
78  * const int count = MBED_COUNT_VA_ARGS("Address 0x%x, Data[0] = %d Data[1] = %d", 0x20001234, 10, 20)
79  * @endcode
80  */
81 #define MBED_COUNT_VA_ARGS(...) GET_NTH_ARG_(__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
82 #define GET_NTH_ARG_(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, N, ...) N
83 
84 #endif
85 
86 /** @}*/
87 /** @}*/
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