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lmdb-safe
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Add `rbegin()` and `lower_bound()` for main DB

This commit is contained in:
Martchus 2022-02-25 00:11:17 +01:00
parent bf6dbf0e42
commit f6fd78155b
1 changed files with 31 additions and 1 deletions
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32
lmdb-typed.hh
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@ -561,7 +561,37 @@ public:
}
return iter_t<StorageType>{ &d_parent, std::move(cursor), false, false };
};
}
template <template <typename> class StorageType = DirectStorage> iter_t<StorageType> rbegin()
{
typename Parent::cursor_t cursor = (*d_parent.d_txn)->getCursor(d_parent.d_parent->d_main);
MDBOutVal out, id;
if (cursor.get(out, id, MDB_LAST)) {
// on_index, one_key, end
return iter_t<StorageType>{ &d_parent, std::move(cursor), false, false, true };
}
return iter_t<StorageType>{ &d_parent, std::move(cursor), false, false };
}
template <template <typename> class StorageType = DirectStorage> iter_t<StorageType> lower_bound(IDType id)
{
typename Parent::cursor_t cursor = (*d_parent.d_txn)->getCursor(d_parent.d_parent->d_main);
MDBInVal in(id);
MDBOutVal out, id2;
out.d_mdbval = in.d_mdbval;
if (cursor.get(out, id2, MDB_SET_RANGE)) {
// on_index, one_key, end
return iter_t<StorageType>{ &d_parent, std::move(cursor), false, false, true };
}
return iter_t<StorageType>{ &d_parent, std::move(cursor), false, false };
}
template <std::size_t N, template <typename> class StorageType = DirectStorage> iter_t<DirectStorage, IDType> begin_idx()
{