std: its a label, usable as a target for goto.
As pointed by @Adam Rosenfield in a comment, it is a legal label name.
C++03 ยง6.1/1:
Labels have their own name space and do not interfere with other identifiers.
std: its a label, usable as a target for goto.
As pointed by @Adam Rosenfield in a comment, it is a legal label name.
C++03 ยง6.1/1:
Labels have their own name space and do not interfere with other identifiers.