You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
2.5 KiB
57 lines
2.5 KiB
// Copyright (c) 2016 The Bitcoin Core developers
|
|
// Distributed under the MIT software license, see the accompanying
|
|
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
|
|
|
#ifndef BITCOIN_INDIRECTMAP_H
|
|
#define BITCOIN_INDIRECTMAP_H
|
|
|
|
template <class T>
|
|
struct DereferencingComparator { bool operator()(const T a, const T b) const { return *a < *b; } };
|
|
|
|
/* Map whose keys are pointers, but are compared by their dereferenced values.
|
|
*
|
|
* Differs from a plain std::map<const K*, T, DereferencingComparator<K*> > in
|
|
* that methods that take a key for comparison take a K rather than taking a K*
|
|
* (taking a K* would be confusing, since it's the value rather than the address
|
|
* of the object for comparison that matters due to the dereferencing comparator).
|
|
*
|
|
* Objects pointed to by keys must not be modified in any way that changes the
|
|
* result of DereferencingComparator.
|
|
*/
|
|
template <class K, class T>
|
|
class indirectmap {
|
|
private:
|
|
typedef std::map<const K*, T, DereferencingComparator<const K*> > base;
|
|
base m;
|
|
public:
|
|
typedef typename base::iterator iterator;
|
|
typedef typename base::const_iterator const_iterator;
|
|
typedef typename base::size_type size_type;
|
|
typedef typename base::value_type value_type;
|
|
|
|
// passthrough (pointer interface)
|
|
std::pair<iterator, bool> insert(const value_type& value) { return m.insert(value); }
|
|
|
|
// pass address (value interface)
|
|
iterator find(const K& key) { return m.find(&key); }
|
|
const_iterator find(const K& key) const { return m.find(&key); }
|
|
iterator lower_bound(const K& key) { return m.lower_bound(&key); }
|
|
const_iterator lower_bound(const K& key) const { return m.lower_bound(&key); }
|
|
size_type erase(const K& key) { return m.erase(&key); }
|
|
size_type count(const K& key) const { return m.count(&key); }
|
|
|
|
// passthrough
|
|
bool empty() const { return m.empty(); }
|
|
size_type size() const { return m.size(); }
|
|
size_type max_size() const { return m.max_size(); }
|
|
void clear() { m.clear(); }
|
|
iterator begin() { return m.begin(); }
|
|
iterator end() { return m.end(); }
|
|
const_iterator begin() const { return m.begin(); }
|
|
const_iterator end() const { return m.end(); }
|
|
const_iterator cbegin() const { return m.cbegin(); }
|
|
const_iterator cend() const { return m.cend(); }
|
|
};
|
|
|
|
#endif // BITCOIN_INDIRECTMAP_H
|