Subject: Re: [boost] RFC: interest in Unicode codecs?
From: Edward Grace (ej.grace_at_[hidden])
Date: 2009-07-20 13:50:14
>> These are assumptions that I would probably be
>> happy to accept in my own internal-use code, but you are right to say
>> that they are probably not appropriate for library code. For library
>> code you would need to wrap the container with something that
>> this behaviour in a more solid way. Out of interest, does anyone
>> if a std::vector that has been reserve()d guarantees anything about
>> dereferencing beyond-the-end iterators? It would be great if they
>> allowed to be undefined yet certain not to segfault.
> Undefined behavior. Don't do it.
I'm having precisely this problem with a home brewed strided_iterator
Given a std::vector<int> 'a' containing
I would like to sort the sub range defined by every second element
starting at index 1.
Conceptually something like:
so that I obtain
While it works fine under g++, on MSVC it throws a segfault when
applying the prefix ++ operator since it attempts to dereference the
location one past one past the end.
Irritating beyond belief! As far as I can see there's no way around
this with bare iterators. Any suggestions?
"No more boom and bust." -- Dr. J. G. Brown, 1997
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