Title
Combining absent encoding-prefixes
Status
tentatively ready
Section
5.13.5 [lex.string]
Submitter
Jan Schultke

Created on 2024-03-09.00:00:00 last changed 4 weeks ago

Messages

Date: 2024-05-17.22:24:28

Proposed resolution (approved by CWG 2024-05-17):

Change in 5.13.5 [lex.string] paragraph 7 as follows:

The common encoding-prefix for a sequence of adjacent string-literals is determined pairwise as follows: If two string-literals have the same encoding-prefix , the common encoding-prefix is that encoding-prefix . If one string-literal has no encoding-prefix , the common encoding-prefix is that of the other string-literal. Any other combinations are ill-formed.

The string-literals in any sequence of adjacent string-literals shall have at most one unique encoding-prefix among them. The common encoding-prefix of the sequence is that encoding-prefix, if any.

Date: 2024-05-09.06:27:48

CWG 2024-05-03

CWG preferred a holistic instead of a pairwise approach.

Date: 2024-05-09.06:27:48

(From submission #511.)

Subclause 5.13.5 [lex.string] paragraph 7 does not properly handle the case where both encoding-prefixes are absent:

The common encoding-prefix for a sequence of adjacent string-literals is determined pairwise as follows: If two string-literals have the same encoding-prefix , the common encoding-prefix is that encoding-prefix . If one string-literal has no encoding-prefix , the common encoding-prefix is that of the other string-literal. Any other combinations are ill-formed.

Possible resolution [SUPERSEDED]:

Change in 5.13.5 [lex.string] paragraph 7 as follows:

The common encoding-prefix for a sequence of adjacent string-literals is determined pairwise as follows: If two string-literals have the same encoding-prefix, the common encoding-prefix is that encoding-prefix. If one string-literal has no encoding-prefix, the common encoding-prefix is that of the other string-literal or is absent if the other string-literal has no encoding-prefix. Otherwise, both string-literals shall have the same encoding-prefix, and the common encoding-prefix is that encoding-prefix. Any other combinations are ill-formed.
History
Date User Action Args
2024-05-17 22:24:28adminsetstatus: review -> tentatively ready
2024-05-09 06:27:48adminsetmessages: + msg7693
2024-05-09 06:27:48adminsetmessages: + msg7692
2024-05-09 06:27:48adminsetstatus: open -> review
2024-03-09 00:00:00admincreate