61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
/*
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Copyright (c) 2013 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#pragma once
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#include <utility>
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#include "util/pair.h"
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#include "util/splay_tree.h"
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namespace lean {
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/**
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\brief Wrapper for implementing maps using splay trees.
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*/
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template<typename K, typename T, typename CMP>
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class splay_map : public CMP {
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typedef std::pair<K, T> entry;
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struct entry_cmp : public CMP {
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entry_cmp(CMP const & c):CMP(c) {}
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int operator()(entry const & e1, entry const & e2) const { return CMP::operator()(e1.first, e2.first); }
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};
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splay_tree<entry, entry_cmp> m_map;
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public:
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splay_map(CMP const & cmp = CMP()):m_map(entry_cmp(cmp)) {}
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void swap(splay_map & m) { m_map.swap(m.m_map); }
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bool empty() const { return m_map.empty(); }
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void clear() { m_map.clear(); }
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bool is_eqp(splay_map const & m) const { return m_map.is_eqp(m); }
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unsigned size() const { return m_map.size(); }
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void insert(K const & k, T const & v) { m_map.insert(mk_pair(k, v)); }
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entry const * find(K const & k) const { return m_map.find(mk_pair(k, T())); }
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bool contains(K const & k) const { return m_map.contains(mk_pair(k, T())); }
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entry const * find_memoize(K const & k) { return m_map.contains(mk_pair(k, T())); }
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void erase(K const & k) { m_map.erase(mk_pair(k, T())); }
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class ref {
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splay_map & m_map;
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K const & m_key;
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public:
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ref(splay_map & m, K const & k):m_map(m), m_key(k) {}
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ref & operator=(T const & v) { m_map.insert(m_key, v); return *this; }
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operator T const &() {
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entry const * e = m_map.find(m_key);
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if (e) {
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return e->second;
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} else {
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m_map.insert(m_key, T());
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return m_map.find(m_key)->second;
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}
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}
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};
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/**
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\brief Returns a reference to the value that is mapped to a key equivalent to key,
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performing an insertion if such key does not already exist.
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*/
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ref operator[](K const & k) { return ref(*this, k); }
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};
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}
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