This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of TC1 status.
double
specifier for do_get()
Section: 30.4.3.2.3 [facet.num.get.virtuals] Status: TC1 Submitter: Dietmar Kühl Opened: 1999-07-20 Last modified: 2016-01-28
Priority: Not Prioritized
View other active issues in [facet.num.get.virtuals].
View all other issues in [facet.num.get.virtuals].
View all issues with TC1 status.
Discussion:
The table in paragraph 7 for the length modifier does not list the length
modifier l
to be applied if the type is double
. Thus, the
standard asks the implementation to do undefined things when using scanf()
(the missing length modifier for scanf()
when scanning double
s
is actually a problem I found quite often in production code, too).
Proposed resolution:
In 30.4.3.2.3 [facet.num.get.virtuals], paragraph 7, add a row in the Length
Modifier table to say that for double
a length modifier
l
is to be used.
Rationale:
The standard makes an embarrassing beginner's mistake.