Your message dated Tue, 23 Jun 2015 07:24:48 +0000
with message-id <e1z7izc-0001ty...@franck.debian.org>
and subject line Bug#789156: Removed package(s) from unstable
has caused the Debian Bug report #739502,
regarding libstdc++6-4.7-dev: std::set<>::operator== uses operator== to compare
elements
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
(NB: If you are a system administrator and have no idea what this
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immediately.)
--
739502: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=739502
Debian Bug Tracking System
Contact ow...@bugs.debian.org with problems
--- Begin Message ---
Package: libstdc++6-4.7-dev
Version: 4.7.2-5
Severity: important
Hello.
std::set<>::operator== uses operator== to compare elements instead of functor,
specified in template parameters.
This makes imposible to compare sets of elements, which requires custom compare
operator.
Minimal code example, which represents this wrong behaviour, is attached.
std::set<>::operator== uses underlying _Rb_tree container's operator==
(stl_set.h:706),
which uses std::equal (stl_tree.h:867) to compare content by specifying
iterators range.
std::equal, in turn, uses operator== to compare elements (stl_algobase.h:791).
-- System Information:
Debian Release: 7.4
APT prefers stable
APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.2.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libstdc++6-4.7-dev depends on:
ii g++-4.7 4.7.2-5
ii gcc-4.7-base 4.7.2-5
ii libc6-dev 2.13-38+deb7u1
ii libstdc++6 4.7.2-5
libstdc++6-4.7-dev recommends no packages.
Versions of packages libstdc++6-4.7-dev suggests:
pn libstdc++6-4.7-doc <none>
-- no debconf information
#include <set>
#include <iostream>
#include <memory>
template <
class C,
class PtrType = std::shared_ptr<C>,
class Compare = std::less<C>
>
class CompareByValue {
public:
CompareByValue(): cmp() {}
inline bool operator()(const PtrType& _1, const PtrType& _2) const {
return _1 ? (_2 && cmp(*_1, *_2)) : bool(_2);
}
private:
Compare cmp;
};
// Simple class with operator<.
class A {
public:
A(const std::size_t i_): i(i_) {}
bool operator<(const A& other) const {return i < other.i;}
std::size_t getI() const {return i;}
private:
const std::size_t i;
};
std::ostream& operator<<(std::ostream& stream, const A& c) {
return stream << c.getI();
}
int main(int, char**) {
typedef std::set<std::shared_ptr<A>, CompareByValue<A> > Set;
using std::make_shared;
// Initializing containers
Set s0{make_shared<A>(1), make_shared<A>(2), make_shared<A>(3)};
Set s1{make_shared<A>(1), make_shared<A>(2), make_shared<A>(3)};
// Print containers content
for (const auto& s : {s0, s1}) {
for (const auto i : s)
std::cout << *i << " ";
std::cout << std::endl;
}
// Manually compare elements using CompareByValue<> and print results.
CompareByValue<A> cmp;
for (auto i0 = s0.begin(), i1 = s1.begin(); i0 != s0.end(); ++i0, ++i1) {
std::cout << (!(cmp(*i0, *i1) || cmp(*i0, *i1))) << " ";
}
std::cout << std::endl;
// Comparing containers using std::set<>::operator== ...Oops!
std::cout << std::boolalpha << (s0 == s1) << std::endl;
}
--- End Message ---
--- Begin Message ---
Version: 4.7.4-3+rm
Dear submitter,
as the package gcc-4.7 has just been removed from the Debian archive
unstable we hereby close the associated bug reports. We are sorry
that we couldn't deal with your issue properly.
For details on the removal, please see https://bugs.debian.org/789156
The version of this package that was in Debian prior to this removal
can still be found using http://snapshot.debian.org/.
This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmas...@ftp-master.debian.org.
Debian distribution maintenance software
pp.
Luca Falavigna (the ftpmaster behind the curtain)
--- End Message ---
