89 lines
3 KiB
C++
89 lines
3 KiB
C++
// Copyright 2013 Google Inc. All Rights Reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//
|
|
// The safe_btree_map<> is like btree_map<> except that it removes the caveat
|
|
// about insertion and deletion invalidating existing iterators at a small cost
|
|
// in making iterators larger and slower.
|
|
//
|
|
// Revalidation occurs whenever an iterator is accessed. References
|
|
// and pointers returned by safe_btree_map<> iterators are not stable,
|
|
// they are potentially invalidated by any non-const method on the map.
|
|
//
|
|
// BEGIN INCORRECT EXAMPLE
|
|
// for (auto i = safe_map->begin(); i != safe_map->end(); ++i) {
|
|
// const T *value = &i->second; // DO NOT DO THIS
|
|
// [code that modifies safe_map and uses value];
|
|
// }
|
|
// END INCORRECT EXAMPLE
|
|
#ifndef UTIL_BTREE_SAFE_BTREE_MAP_H__
|
|
#define UTIL_BTREE_SAFE_BTREE_MAP_H__
|
|
|
|
#include <functional>
|
|
#include <memory>
|
|
#include <utility>
|
|
|
|
#include "btree_container.h"
|
|
#include "btree_map.h"
|
|
#include "safe_btree.h"
|
|
|
|
namespace btree {
|
|
|
|
// The safe_btree_map class is needed mainly for its constructors.
|
|
template <typename Key, typename Value,
|
|
typename Compare = std::less<Key>,
|
|
typename Alloc = std::allocator<std::pair<const Key, Value> >,
|
|
int TargetNodeSize = 256>
|
|
class safe_btree_map : public btree_map_container<
|
|
safe_btree<btree_map_params<Key, Value, Compare, Alloc, TargetNodeSize> > > {
|
|
|
|
typedef safe_btree_map<Key, Value, Compare, Alloc, TargetNodeSize> self_type;
|
|
typedef btree_map_params<
|
|
Key, Value, Compare, Alloc, TargetNodeSize> params_type;
|
|
typedef safe_btree<params_type> btree_type;
|
|
typedef btree_map_container<btree_type> super_type;
|
|
|
|
public:
|
|
typedef typename btree_type::key_compare key_compare;
|
|
typedef typename btree_type::allocator_type allocator_type;
|
|
|
|
public:
|
|
// Default constructor.
|
|
safe_btree_map(const key_compare &comp = key_compare(),
|
|
const allocator_type &alloc = allocator_type())
|
|
: super_type(comp, alloc) {
|
|
}
|
|
|
|
// Copy constructor.
|
|
safe_btree_map(const self_type &x)
|
|
: super_type(x) {
|
|
}
|
|
|
|
// Range constructor.
|
|
template <class InputIterator>
|
|
safe_btree_map(InputIterator b, InputIterator e,
|
|
const key_compare &comp = key_compare(),
|
|
const allocator_type &alloc = allocator_type())
|
|
: super_type(b, e, comp, alloc) {
|
|
}
|
|
};
|
|
|
|
template <typename K, typename V, typename C, typename A, int N>
|
|
inline void swap(safe_btree_map<K, V, C, A, N> &x,
|
|
safe_btree_map<K, V, C, A, N> &y) {
|
|
x.swap(y);
|
|
}
|
|
|
|
} // namespace btree
|
|
|
|
#endif // UTIL_BTREE_SAFE_BTREE_MAP_H__
|