16
Library introduction
[library]
16.4
Library-wide requirements
[requirements]
16.4.6
Conforming implementations
[conforming]
16.4.6.3
Restrictions on macro definitions
[res.on.macro.definitions]
1
#
The names and global function signatures described in
[contents]
are reserved to the implementation
.
2
#
All object-like macros defined by the C standard library and described in this Clause as expanding to integral constant expressions are also suitable for use in
#if
preprocessing directives, unless explicitly stated otherwise
.