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+// Copyright (c) 2005, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+//
+// This is just a very thin wrapper over densehashtable.h, just
+// like sgi stl's stl_hash_set is a very thin wrapper over
+// stl_hashtable.  The major thing we define is operator[], because
+// we have a concept of a data_type which stl_hashtable doesn't
+// (it only has a key and a value).
+//
+// This is more different from dense_hash_map than you might think,
+// because all iterators for sets are const (you obviously can't
+// change the key, and for sets there is no value).
+//
+// NOTE: this is exactly like sparse_hash_set.h, with the word
+// "sparse" replaced by "dense", except for the addition of
+// set_empty_key().
+//
+//   YOU MUST CALL SET_EMPTY_KEY() IMMEDIATELY AFTER CONSTRUCTION.
+//
+// Otherwise your program will die in mysterious ways.  (Note if you
+// use the constructor that takes an InputIterator range, you pass in
+// the empty key in the constructor, rather than after.  As a result,
+// this constructor differs from the standard STL version.)
+//
+// In other respects, we adhere mostly to the STL semantics for
+// hash-map.  One important exception is that insert() may invalidate
+// iterators entirely -- STL semantics are that insert() may reorder
+// iterators, but they all still refer to something valid in the
+// hashtable.  Not so for us.  Likewise, insert() may invalidate
+// pointers into the hashtable.  (Whether insert invalidates iterators
+// and pointers depends on whether it results in a hashtable resize).
+// On the plus side, delete() doesn't invalidate iterators or pointers
+// at all, or even change the ordering of elements.
+//
+// Here are a few "power user" tips:
+//
+//    1) set_deleted_key():
+//         If you want to use erase() you must call set_deleted_key(),
+//         in addition to set_empty_key(), after construction.
+//         The deleted and empty keys must differ.
+//
+//    2) resize(0):
+//         When an item is deleted, its memory isn't freed right
+//         away.  This allows you to iterate over a hashtable,
+//         and call erase(), without invalidating the iterator.
+//         To force the memory to be freed, call resize(0).
+//         For tr1 compatibility, this can also be called as rehash(0).
+//
+//    3) min_load_factor(0.0)
+//         Setting the minimum load factor to 0.0 guarantees that
+//         the hash table will never shrink.
+//
+// Roughly speaking:
+//   (1) dense_hash_set: fastest, uses the most memory unless entries are small
+//   (2) sparse_hash_set: slowest, uses the least memory
+//   (3) hash_set / unordered_set (STL): in the middle
+//
+// Typically I use sparse_hash_set when I care about space and/or when
+// I need to save the hashtable on disk.  I use hash_set otherwise.  I
+// don't personally use dense_hash_set ever; some people use it for
+// small sets with lots of lookups.
+//
+// - dense_hash_set has, typically, about 78% memory overhead (if your
+//   data takes up X bytes, the hash_set uses .78X more bytes in overhead).
+// - sparse_hash_set has about 4 bits overhead per entry.
+// - sparse_hash_set can be 3-7 times slower than the others for lookup and,
+//   especially, inserts.  See time_hash_map.cc for details.
+//
+// See /usr/(local/)?doc/sparsehash-*/dense_hash_set.html
+// for information about how to use this class.
+
+#ifndef _DENSE_HASH_SET_H_
+#define _DENSE_HASH_SET_H_
+
+#include <sparsehash/internal/sparseconfig.h>
+#include <algorithm>                        // needed by stl_alloc
+#include <functional>                       // for equal_to<>, select1st<>, etc
+#include <memory>                           // for alloc
+#include <utility>                          // for pair<>
+#include <sparsehash/internal/densehashtable.h>        // IWYU pragma: export
+#include <sparsehash/internal/libc_allocator_with_realloc.h>
+#include HASH_FUN_H                 // for hash<>
+_START_GOOGLE_NAMESPACE_
+
+template <class Value,
+          class HashFcn = SPARSEHASH_HASH<Value>,   // defined in sparseconfig.h
+          class EqualKey = std::equal_to<Value>,
+          class Alloc = libc_allocator_with_realloc<Value> >
+class dense_hash_set {
+ private:
+  // Apparently identity is not stl-standard, so we define our own
+  struct Identity {
+    typedef const Value& result_type;
+    const Value& operator()(const Value& v) const { return v; }
+  };
+  struct SetKey {
+    void operator()(Value* value, const Value& new_key) const {
+      *value = new_key;
+    }
+  };
+
+  // The actual data
+  typedef dense_hashtable<Value, Value, HashFcn, Identity, SetKey,
+                          EqualKey, Alloc> ht;
+  ht rep;
+
+ public:
+  typedef typename ht::key_type key_type;
+  typedef typename ht::value_type value_type;
+  typedef typename ht::hasher hasher;
+  typedef typename ht::key_equal key_equal;
+  typedef Alloc allocator_type;
+
+  typedef typename ht::size_type size_type;
+  typedef typename ht::difference_type difference_type;
+  typedef typename ht::const_pointer pointer;
+  typedef typename ht::const_pointer const_pointer;
+  typedef typename ht::const_reference reference;
+  typedef typename ht::const_reference const_reference;
+
+  typedef typename ht::const_iterator iterator;
+  typedef typename ht::const_iterator const_iterator;
+  typedef typename ht::const_local_iterator local_iterator;
+  typedef typename ht::const_local_iterator const_local_iterator;
+
+
+  // Iterator functions -- recall all iterators are const
+  iterator begin() const                  { return rep.begin(); }
+  iterator end() const                    { return rep.end(); }
+
+  // These come from tr1's unordered_set. For us, a bucket has 0 or 1 elements.
+  local_iterator begin(size_type i) const { return rep.begin(i); }
+  local_iterator end(size_type i) const   { return rep.end(i); }
+
+
+  // Accessor functions
+  allocator_type get_allocator() const    { return rep.get_allocator(); }
+  hasher hash_funct() const               { return rep.hash_funct(); }
+  hasher hash_function() const            { return hash_funct(); }  // tr1 name
+  key_equal key_eq() const                { return rep.key_eq(); }
+
+
+  // Constructors
+  explicit dense_hash_set(size_type expected_max_items_in_table = 0,
+                          const hasher& hf = hasher(),
+                          const key_equal& eql = key_equal(),
+                          const allocator_type& alloc = allocator_type())
+      : rep(expected_max_items_in_table, hf, eql, Identity(), SetKey(), alloc) {
+  }
+
+  template <class InputIterator>
+  dense_hash_set(InputIterator f, InputIterator l,
+                 const key_type& empty_key_val,
+                 size_type expected_max_items_in_table = 0,
+                 const hasher& hf = hasher(),
+                 const key_equal& eql = key_equal(),
+                 const allocator_type& alloc = allocator_type())
+      : rep(expected_max_items_in_table, hf, eql, Identity(), SetKey(), alloc) {
+    set_empty_key(empty_key_val);
+    rep.insert(f, l);
+  }
+  // We use the default copy constructor
+  // We use the default operator=()
+  // We use the default destructor
+
+  void clear()                        { rep.clear(); }
+  // This clears the hash set without resizing it down to the minimum
+  // bucket count, but rather keeps the number of buckets constant
+  void clear_no_resize()              { rep.clear_no_resize(); }
+  void swap(dense_hash_set& hs)       { rep.swap(hs.rep); }
+
+
+  // Functions concerning size
+  size_type size() const              { return rep.size(); }
+  size_type max_size() const          { return rep.max_size(); }
+  bool empty() const                  { return rep.empty(); }
+  size_type bucket_count() const      { return rep.bucket_count(); }
+  size_type max_bucket_count() const  { return rep.max_bucket_count(); }
+
+  // These are tr1 methods.  bucket() is the bucket the key is or would be in.
+  size_type bucket_size(size_type i) const    { return rep.bucket_size(i); }
+  size_type bucket(const key_type& key) const { return rep.bucket(key); }
+  float load_factor() const {
+    return size() * 1.0f / bucket_count();
+  }
+  float max_load_factor() const {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    return grow;
+  }
+  void max_load_factor(float new_grow) {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    rep.set_resizing_parameters(shrink, new_grow);
+  }
+  // These aren't tr1 methods but perhaps ought to be.
+  float min_load_factor() const {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    return shrink;
+  }
+  void min_load_factor(float new_shrink) {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    rep.set_resizing_parameters(new_shrink, grow);
+  }
+  // Deprecated; use min_load_factor() or max_load_factor() instead.
+  void set_resizing_parameters(float shrink, float grow) {
+    rep.set_resizing_parameters(shrink, grow);
+  }
+
+  void resize(size_type hint)         { rep.resize(hint); }
+  void rehash(size_type hint)         { resize(hint); }     // the tr1 name
+
+  // Lookup routines
+  iterator find(const key_type& key) const           { return rep.find(key); }
+
+  size_type count(const key_type& key) const         { return rep.count(key); }
+
+  std::pair<iterator, iterator> equal_range(const key_type& key) const {
+    return rep.equal_range(key);
+  }
+
+
+  // Insertion routines
+  std::pair<iterator, bool> insert(const value_type& obj) {
+    std::pair<typename ht::iterator, bool> p = rep.insert(obj);
+    return std::pair<iterator, bool>(p.first, p.second);   // const to non-const
+  }
+  template <class InputIterator> void insert(InputIterator f, InputIterator l) {
+    rep.insert(f, l);
+  }
+  void insert(const_iterator f, const_iterator l) {
+    rep.insert(f, l);
+  }
+  // Required for std::insert_iterator; the passed-in iterator is ignored.
+  iterator insert(iterator, const value_type& obj)   {
+    return insert(obj).first;
+  }
+
+  // Deletion and empty routines
+  // THESE ARE NON-STANDARD!  I make you specify an "impossible" key
+  // value to identify deleted and empty buckets.  You can change the
+  // deleted key as time goes on, or get rid of it entirely to be insert-only.
+  void set_empty_key(const key_type& key)     { rep.set_empty_key(key); }
+  key_type empty_key() const                  { return rep.empty_key(); }
+
+  void set_deleted_key(const key_type& key)   { rep.set_deleted_key(key); }
+  void clear_deleted_key()                    { rep.clear_deleted_key(); }
+  key_type deleted_key() const                { return rep.deleted_key(); }
+
+  // These are standard
+  size_type erase(const key_type& key)               { return rep.erase(key); }
+  void erase(iterator it)                            { rep.erase(it); }
+  void erase(iterator f, iterator l)                 { rep.erase(f, l); }
+
+
+  // Comparison
+  bool operator==(const dense_hash_set& hs) const    { return rep == hs.rep; }
+  bool operator!=(const dense_hash_set& hs) const    { return rep != hs.rep; }
+
+
+  // I/O -- this is an add-on for writing metainformation to disk
+  //
+  // For maximum flexibility, this does not assume a particular
+  // file type (though it will probably be a FILE *).  We just pass
+  // the fp through to rep.
+
+  // If your keys and values are simple enough, you can pass this
+  // serializer to serialize()/unserialize().  "Simple enough" means
+  // value_type is a POD type that contains no pointers.  Note,
+  // however, we don't try to normalize endianness.
+  typedef typename ht::NopointerSerializer NopointerSerializer;
+
+  // serializer: a class providing operator()(OUTPUT*, const value_type&)
+  //    (writing value_type to OUTPUT).  You can specify a
+  //    NopointerSerializer object if appropriate (see above).
+  // fp: either a FILE*, OR an ostream*/subclass_of_ostream*, OR a
+  //    pointer to a class providing size_t Write(const void*, size_t),
+  //    which writes a buffer into a stream (which fp presumably
+  //    owns) and returns the number of bytes successfully written.
+  //    Note basic_ostream<not_char> is not currently supported.
+  template <typename ValueSerializer, typename OUTPUT>
+  bool serialize(ValueSerializer serializer, OUTPUT* fp) {
+    return rep.serialize(serializer, fp);
+  }
+
+  // serializer: a functor providing operator()(INPUT*, value_type*)
+  //    (reading from INPUT and into value_type).  You can specify a
+  //    NopointerSerializer object if appropriate (see above).
+  // fp: either a FILE*, OR an istream*/subclass_of_istream*, OR a
+  //    pointer to a class providing size_t Read(void*, size_t),
+  //    which reads into a buffer from a stream (which fp presumably
+  //    owns) and returns the number of bytes successfully read.
+  //    Note basic_istream<not_char> is not currently supported.
+  template <typename ValueSerializer, typename INPUT>
+  bool unserialize(ValueSerializer serializer, INPUT* fp) {
+    return rep.unserialize(serializer, fp);
+  }
+};
+
+template <class Val, class HashFcn, class EqualKey, class Alloc>
+inline void swap(dense_hash_set<Val, HashFcn, EqualKey, Alloc>& hs1,
+                 dense_hash_set<Val, HashFcn, EqualKey, Alloc>& hs2) {
+  hs1.swap(hs2);
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#endif /* _DENSE_HASH_SET_H_ */