https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86658
Bug ID: 86658
Summary: Debug mode: std::copy(..., std::inserter(...)) causes
"Error: attempt to copy-construct an iterator from a
singular iterator."
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: sbergman at redhat dot com
Target Milestone: ---
With recent GCC trunk:
> $ cat test.cc
> #define _GLIBCXX_DEBUG
> #include <algorithm>
> #include <iterator>
> #include <vector>
> int main() {
> std::vector<int> v1{0};
> std::vector<int> v2;
> std::copy(v1.begin(), v1.end(), std::inserter(v2, v2.end()));
> std::copy(v1.begin(), v1.end(), std::inserter(v2, v2.end()));
> }
>
> $ gcc/inst/bin/g++ --version
> g++ (GCC) 9.0.0 20180724 (experimental)
> Copyright (C) 2018 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> $ gcc/inst/bin/g++ test.cc
> $ LD_LIBRARY_PATH=/home/sbergman/gcc/inst/lib64 ./a.out
> /home/sbergman/gcc/inst/include/c++/9.0.0/debug/safe_iterator.h:140:
> In function:
> __gnu_debug::_Safe_iterator<_Iterator, _Sequence>::_Safe_iterator(const
> __gnu_debug::_Safe_iterator<_Iterator, _Sequence>&) [with _Iterator =
> __gnu_cxx::__normal_iterator<int*, std::__cxx1998::vector<int,
> std::allocator<int> > >; _Sequence = std::__debug::vector<int>]
>
> Error: attempt to copy-construct an iterator from a singular iterator.
>
> Objects involved in the operation:
> iterator "this" @ 0x0x7fff69d830c8 {
> type = __gnu_cxx::__normal_iterator<int*, std::__cxx1998::vector<int,
> std::allocator<int> > > (mutable iterator);
> state = singular;
> }
> iterator "other" @ 0x0x7fff69d83178 {
> type = __gnu_cxx::__normal_iterator<int*, std::__cxx1998::vector<int,
> std::allocator<int> > > (mutable iterator);
> state = singular;
> references sequence with type 'std::__debug::vector<int,
> std::allocator<int> >' @ 0x0x7fff69d83280
> }
> Aborted (core dumped)
