16
Library introduction
[library]
16.5
Library-wide requirements
[requirements]
16.5.4
Constraints on programs
[constraints]
16.5.4.3
Reserved names
[reserved.names]
16.5.4.3.5
User-defined literal suffixes
[usrlit.suffix]
1
#
Literal suffix identifiers
that do not start with an underscore are reserved for future standardization
.