| Name | Checked | Synopsis |
|---|
|
12#1
|
 |
All identifiers used in preprocessor directives shall be defined. |
|
12#2
|
|
Avoid esoteric aspects of preprocessing such as token pasting, text after #else or #endif, or relying on macro argument substitution within string literals. |
|
12.1#1
|
|
Trigraphs shall not be used. |
|
12.1#2
|
|
Avoid writing two adjacent question marks anywhere within your source code. |
|
12.3#1
|
|
Always enclose any instances of macro parameters within parentheses. |
|
12.3#2
|
|
If a macro body contains any operator, enclose it within parentheses. |
|
12.3#3
|
|
Do not use macros to redefine keywords. |
|
12.3#4
|
|
Avoid defining macros with unbalanced brackets or parentheses. |
|
12.3#5
|
|
Macros should behave like symbolic constants or functions, (as function-like macros). |
|
12.3#6
|
|
Use const to provide typed constants in preference to #define where legal and appropriate to do so. |
|
12.3#7
|
|
Use functions in preference to function-like macros unless performance is a genuine issue. |
|
12.3#8
|
|
Defining a macro called defined or attempting to #undef it, is forbidden. |
|
12.3#9
|
|
Attempting to #define or #undef any of __LINE__, __FILE__, __DATE__, __TIME__, or __STDC__ is forbidden. |
|
12.3#10
|
|
A function-like macro must be supplied with its expected arguments. |
|
12.3#11
|
|
Macro arguments must not contain a sequence of tokens which look like a preprocessor directive. |
|
12.3.1#1
|
|
A macro shall not comprise both the "#" and "##" operators simultaneously. |
|
12.3.2#1
|
|
The result of the "##" operator shall be a legal pre-processing token. |
|
12.4#1
|
|
The #include directive must only be followed by a <...> or a "..." file sequence. |
|
12.4#2
|
|
Use of the ' " \ or /* characters in the #include file sequence <...> or "...", is forbidden. |
|
12.5#1
|
|
The defined macro must appear in the form 'defined(identifier)' or 'defined identifier'. |
|
12.6#1
|
|
The #line directive shall specify a line number in the range 1 to 32767. |
|
12.8#1
|
|
The #pragma directive shall not be used without sign-off according to local quality procedures. |
|
12.9#1
|
|
The null preprocessor directive # should not be used. |
|
C#2
|
|
The #error directive should be used with caution. |
