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ircd::util: Simplify unique_iterator related.

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This commit is contained in:
Jason Volk 2017-08-16 10:24:49 -06:00
parent ad611c5aa5
commit 77a6bc2d51
1 changed files with 16 additions and 36 deletions
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52
include/ircd/util.h
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@ -1069,47 +1069,19 @@ 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.
// For objects using the pattern of adding their own instance to a container
// in their constructor, storing an iterator as a member, and then removing
// themselves using the iterator in their 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>
template<class container,
class iterator = typename container::iterator>
struct unique_iterator
{
container *c;
typename container::iterator it;
iterator it;
unique_iterator(container &c, typename container::iterator it)
unique_iterator(container &c, iterator it)
:c{&c}
,it{std::move(it)}
{}
@ -1133,6 +1105,14 @@ struct unique_iterator
}
};
template<class container>
struct unique_const_iterator
:unique_iterator<container, typename container::const_iterator>
{
using iterator_type = typename container::const_iterator;
using unique_iterator<container, iterator_type>::unique_iterator;
};
//
// Get the index of a tuple element by address at runtime