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/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2015 Red Hat, Inc
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_COMPACT_SET_H
#define CEPH_COMPACT_SET_H
#include "buffer.h"
#include "encoding.h"
#include <memory>
#include <set>
template <class T, class Set>
class compact_set_base {
protected:
std::unique_ptr<Set> set;
void alloc_internal() {
if (!set)
set.reset(new Set);
}
void free_internal() {
set.reset();
}
template <class It>
class iterator_base {
private:
const compact_set_base* set;
It it;
iterator_base() : set(0) { }
iterator_base(const compact_set_base* s) : set(s) { }
iterator_base(const compact_set_base* s, const It& i) : set(s), it(i) { }
friend class compact_set_base;
public:
iterator_base(const iterator_base& o) {
set = o.set;
it = o.it;
}
bool operator==(const iterator_base& o) const {
return (set == o.set) && (!set->set || it == o.it);
}
bool operator!=(const iterator_base& o) const {
return !(*this == o);;
}
iterator_base& operator=(const iterator_base& o) {
set->set = o.set;
it = o.it;
return *this;
}
iterator_base& operator++() {
++it;
return *this;
}
iterator_base operator++(int) {
iterator_base tmp = *this;
++it;
return tmp;
}
iterator_base& operator--() {
--it;
return *this;
}
const T& operator*() {
return *it;
}
};
public:
class const_iterator : public iterator_base<typename Set::const_iterator> {
public:
const_iterator() { }
const_iterator(const iterator_base<typename Set::const_iterator>& o)
: iterator_base<typename Set::const_iterator>(o) { }
const_iterator(const compact_set_base* s) : iterator_base<typename Set::const_iterator>(s) { }
const_iterator(const compact_set_base* s, const typename Set::const_iterator& i)
: iterator_base<typename Set::const_iterator>(s, i) { }
};
class iterator : public iterator_base<typename Set::iterator> {
public:
iterator() { }
iterator(const iterator_base<typename Set::iterator>& o)
: iterator_base<typename Set::iterator>(o) { }
iterator(compact_set_base* s) : iterator_base<typename Set::iterator>(s) { }
iterator(compact_set_base* s, const typename Set::iterator& i)
: iterator_base<typename Set::iterator>(s, i) { }
operator const_iterator() const {
return const_iterator(this->set, this->it);
}
};
class const_reverse_iterator : public iterator_base<typename Set::const_reverse_iterator> {
public:
const_reverse_iterator() { }
const_reverse_iterator(const iterator_base<typename Set::const_reverse_iterator>& o)
: iterator_base<typename Set::const_reverse_iterator>(o) { }
const_reverse_iterator(const compact_set_base* s) : iterator_base<typename Set::const_reverse_iterator>(s) { }
const_reverse_iterator(const compact_set_base* s, const typename Set::const_reverse_iterator& i)
: iterator_base<typename Set::const_reverse_iterator>(s, i) { }
};
class reverse_iterator : public iterator_base<typename Set::reverse_iterator> {
public:
reverse_iterator() { }
reverse_iterator(const iterator_base<typename Set::reverse_iterator>& o)
: iterator_base<typename Set::reverse_iterator>(o) { }
reverse_iterator(compact_set_base* s) : iterator_base<typename Set::reverse_iterator>(s) { }
reverse_iterator(compact_set_base* s, const typename Set::reverse_iterator& i)
: iterator_base<typename Set::reverse_iterator>(s, i) { }
operator const_iterator() const {
return const_iterator(this->set, this->it);
}
};
compact_set_base() {}
compact_set_base(const compact_set_base& o) {
if (o.set) {
alloc_internal();
*set = *o.set;
}
}
~compact_set_base() {}
bool empty() const {
return !set || set->empty();
}
size_t size() const {
return set ? set->size() : 0;
}
bool operator==(const compact_set_base& o) const {
return (empty() && o.empty()) || (set && o.set && *set == *o.set);
}
bool operator!=(const compact_set_base& o) const {
return !(*this == o);
}
size_t count(const T& t) const {
return set ? set->count(t) : 0;
}
iterator erase (iterator p) {
if (set) {
ceph_assert(this == p.set);
auto it = set->erase(p.it);
if (set->empty()) {
free_internal();
return iterator(this);
} else {
return iterator(this, it);
}
} else {
return iterator(this);
}
}
size_t erase (const T& t) {
if (!set)
return 0;
size_t r = set->erase(t);
if (set->empty())
free_internal();
return r;
}
void clear() {
free_internal();
}
void swap(compact_set_base& o) {
set.swap(o.set);
}
compact_set_base& operator=(const compact_set_base& o) {
if (o.set) {
alloc_internal();
*set = *o.set;
} else
free_internal();
return *this;
}
std::pair<iterator,bool> insert(const T& t) {
alloc_internal();
std::pair<typename Set::iterator,bool> r = set->insert(t);
return std::make_pair(iterator(this, r.first), r.second);
}
template <class... Args>
std::pair<iterator,bool> emplace ( Args&&... args ) {
alloc_internal();
auto em = set->emplace(std::forward<Args>(args)...);
return std::pair<iterator,bool>(iterator(this, em.first), em.second);
}
iterator begin() {
if (!set)
return iterator(this);
return iterator(this, set->begin());
}
iterator end() {
if (!set)
return iterator(this);
return iterator(this, set->end());
}
reverse_iterator rbegin() {
if (!set)
return reverse_iterator(this);
return reverse_iterator(this, set->rbegin());
}
reverse_iterator rend() {
if (!set)
return reverse_iterator(this);
return reverse_iterator(this, set->rend());
}
iterator find(const T& t) {
if (!set)
return iterator(this);
return iterator(this, set->find(t));
}
iterator lower_bound(const T& t) {
if (!set)
return iterator(this);
return iterator(this, set->lower_bound(t));
}
iterator upper_bound(const T& t) {
if (!set)
return iterator(this);
return iterator(this, set->upper_bound(t));
}
const_iterator begin() const {
if (!set)
return const_iterator(this);
return const_iterator(this, set->begin());
}
const_iterator end() const {
if (!set)
return const_iterator(this);
return const_iterator(this, set->end());
}
const_reverse_iterator rbegin() const {
if (!set)
return const_reverse_iterator(this);
return const_reverse_iterator(this, set->rbegin());
}
const_reverse_iterator rend() const {
if (!set)
return const_reverse_iterator(this);
return const_reverse_iterator(this, set->rend());
}
const_iterator find(const T& t) const {
if (!set)
return const_iterator(this);
return const_iterator(this, set->find(t));
}
const_iterator lower_bound(const T& t) const {
if (!set)
return const_iterator(this);
return const_iterator(this, set->lower_bound(t));
}
const_iterator upper_bound(const T& t) const {
if (!set)
return const_iterator(this);
return const_iterator(this, set->upper_bound(t));
}
void encode(ceph::buffer::list &bl) const {
using ceph::encode;
if (set)
encode(*set, bl);
else
encode((uint32_t)0, bl);
}
void decode(ceph::buffer::list::const_iterator& p) {
using ceph::decode;
uint32_t n;
decode(n, p);
if (n > 0) {
alloc_internal();
ceph::decode_nohead(n, *set, p);
} else
free_internal();
}
};
template<class T, class Set>
inline void encode(const compact_set_base<T, Set>& m, ceph::buffer::list& bl) {
m.encode(bl);
}
template<class T, class Set>
inline void decode(compact_set_base<T, Set>& m, ceph::buffer::list::const_iterator& p) {
m.decode(p);
}
template <class T, class Compare = std::less<T>, class Alloc = std::allocator<T> >
class compact_set : public compact_set_base<T, std::set<T, Compare, Alloc> > {
};
template <class T, class Compare = std::less<T>, class Alloc = std::allocator<T> >
inline std::ostream& operator<<(std::ostream& out, const compact_set<T,Compare,Alloc>& s)
{
bool first = true;
for (auto &v : s) {
if (!first)
out << ",";
out << v;
first = false;
}
return out;
}
#endif
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