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ircd::util: Add RAII container for iterators.

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This commit is contained in:
Jason Volk 2017-04-03 23:11:32 -07:00
parent bd772a4452
commit e43b67d146
1 changed files with 66 additions and 0 deletions
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66
include/ircd/util.h
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@ -794,5 +794,71 @@ end(const const_iterators<T> &ci)
}
//
// For instances of objects that want to add themselves to a container
// and store an iterator as a member to remove themselves in the destructor.
// It is unsafe to do that. Use this instead.
//
template<class container>
struct unique_const_iterator
{
container *c;
typename container::const_iterator it;
unique_const_iterator(container &c, typename container::const_iterator it)
:c{&c}
,it{std::move(it)}
{}
unique_const_iterator()
:c{nullptr}
{}
unique_const_iterator(const unique_const_iterator &) = delete;
unique_const_iterator(unique_const_iterator &&o)
:c{std::move(o.c)}
,it{std::move(o.it)}
{
o.c = nullptr;
}
~unique_const_iterator() noexcept
{
if(c)
c->erase(it);
}
};
template<class container>
struct unique_iterator
{
container *c;
typename container::iterator it;
unique_iterator(container &c, typename container::iterator it)
:c{&c}
,it{std::move(it)}
{}
unique_iterator()
:c{nullptr}
{}
unique_iterator(const unique_iterator &) = delete;
unique_iterator(unique_iterator &&o)
:c{std::move(o.c)}
,it{std::move(o.it)}
{
o.c = nullptr;
}
~unique_iterator() noexcept
{
if(c)
c->erase(it);
}
};
} // namespace util
} // namespace ircd