[Bug libstdc++/121054] New: std::bitset<0>("zero") should throw std::invalid_argument

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121054

            Bug ID: 121054
           Summary: std::bitset<0>("zero") should throw
                    std::invalid_argument
           Product: gcc
           Version: 15.1.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

The standard requires that all of the bitset<N> constructors taking a string
check the whole string from [0,n) for invalid characters, not just the first N
characters.

So for bitset<0>("x") and bitset<1>("xx", 2) it should throw, but
bitset<1>("xx", 1) should not (because the 1 says to only use that many
characters from the string).