Section: 22.9.2.2 [bitset.cons] Status: CD1 Submitter: Dag Henriksson Opened: 2004-01-30 Last modified: 2016-01-28
Priority: Not Prioritized
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Discussion:
The constructor from unsigned long says it initializes "the first M bit positions to the corresponding bit values in val. M is the smaller of N and the value CHAR_BIT * sizeof(unsigned long)."
Object-representation vs. value-representation strikes again. CHAR_BIT * sizeof (unsigned long) does not give us the number of bits an unsigned long uses to hold the value. Thus, the first M bit position above is not guaranteed to have any corresponding bit values in val.
Proposed resolution:
In 22.9.2.2 [bitset.cons] paragraph 2, change "M is the smaller of
N and the value CHAR_BIT * sizeof (unsigned long). (249)" to
"M is the smaller of N and the number of bits in
the value representation (section 6.8 [basic.types]) of unsigned
long."