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authorRichard Linden <none@none>2013-12-02 14:57:29 -0800
committerRichard Linden <none@none>2013-12-02 14:57:29 -0800
commit34ff2fc46ba8c623f0eab8fe1dccb5db327775a8 (patch)
tree7bc422dd969e1d18e9d83e52a9a6dcfa2bd6139f /indra/llcommon/llsortedvector.h
parent787ccaf297e81291469aaf269f563d862fb150a3 (diff)
parentd8e92867162f8c4ff9489d8eefde53546e907dff (diff)
merge with release
Diffstat (limited to 'indra/llcommon/llsortedvector.h')
-rwxr-xr-xindra/llcommon/llsortedvector.h152
1 files changed, 0 insertions, 152 deletions
diff --git a/indra/llcommon/llsortedvector.h b/indra/llcommon/llsortedvector.h
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--- a/indra/llcommon/llsortedvector.h
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@@ -1,152 +0,0 @@
-/**
- * @file llsortedvector.h
- * @author Nat Goodspeed
- * @date 2012-04-08
- * @brief LLSortedVector class wraps a vector that we maintain in sorted
- * order so we can perform binary-search lookups.
- *
- * $LicenseInfo:firstyear=2012&license=viewerlgpl$
- * Copyright (c) 2012, Linden Research, Inc.
- * $/LicenseInfo$
- */
-
-#if ! defined(LL_LLSORTEDVECTOR_H)
-#define LL_LLSORTEDVECTOR_H
-
-#include <vector>
-#include <algorithm>
-
-/**
- * LLSortedVector contains a std::vector<std::pair> that we keep sorted on the
- * first of the pair. This makes insertion somewhat more expensive than simple
- * std::vector::push_back(), but allows us to use binary search for lookups.
- * It's intended for small aggregates where lookup is far more performance-
- * critical than insertion; in such cases a binary search on a small, sorted
- * std::vector can be more performant than a std::map lookup.
- */
-template <typename KEY, typename VALUE>
-class LLSortedVector
-{
-public:
- typedef LLSortedVector<KEY, VALUE> self;
- typedef KEY key_type;
- typedef VALUE mapped_type;
- typedef std::pair<key_type, mapped_type> value_type;
- typedef std::vector<value_type> PairVector;
- typedef typename PairVector::iterator iterator;
- typedef typename PairVector::const_iterator const_iterator;
-
- /// Empty
- LLSortedVector() {}
-
- /// Fixed initial size
- LLSortedVector(std::size_t size):
- mVector(size)
- {}
-
- /// Bulk load
- template <typename ITER>
- LLSortedVector(ITER begin, ITER end):
- mVector(begin, end)
- {
- // Allow caller to dump in a bunch of (pairs convertible to)
- // value_type if desired, but make sure we sort afterwards.
- std::sort(mVector.begin(), mVector.end());
- }
-
- /// insert(key, value)
- std::pair<iterator, bool> insert(const key_type& key, const mapped_type& value)
- {
- return insert(value_type(key, value));
- }
-
- /// insert(value_type)
- std::pair<iterator, bool> insert(const value_type& pair)
- {
- typedef std::pair<iterator, bool> iterbool;
- iterator found = std::lower_bound(mVector.begin(), mVector.end(), pair,
- less<value_type>());
- // have to check for end() before it's even valid to dereference
- if (found == mVector.end())
- {
- std::size_t index(mVector.size());
- mVector.push_back(pair);
- // don't forget that push_back() invalidates 'found'
- return iterbool(mVector.begin() + index, true);
- }
- if (found->first == pair.first)
- {
- return iterbool(found, false);
- }
- // remember that insert() invalidates 'found' -- save index
- std::size_t index(found - mVector.begin());
- mVector.insert(found, pair);
- // okay, convert from index back to iterator
- return iterbool(mVector.begin() + index, true);
- }
-
- iterator begin() { return mVector.begin(); }
- iterator end() { return mVector.end(); }
- const_iterator begin() const { return mVector.begin(); }
- const_iterator end() const { return mVector.end(); }
-
- bool empty() const { return mVector.empty(); }
- std::size_t size() const { return mVector.size(); }
-
- /// find
- iterator find(const key_type& key)
- {
- iterator found = std::lower_bound(mVector.begin(), mVector.end(),
- value_type(key, mapped_type()),
- less<value_type>());
- if (found == mVector.end() || found->first != key)
- return mVector.end();
- return found;
- }
-
- const_iterator find(const key_type& key) const
- {
- return const_cast<self*>(this)->find(key);
- }
-
-private:
- // Define our own 'less' comparator so we can specialize without messing
- // with std::less.
- template <typename T>
- struct less: public std::less<T> {};
-
- // Specialize 'less' for an LLSortedVector::value_type involving
- // std::type_info*. This is one of LLSortedVector's foremost use cases. We
- // specialize 'less' rather than just defining a specific comparator
- // because LLSortedVector should be usable for other key_types as well.
- template <typename T>
- struct less< std::pair<std::type_info*, T> >:
- public std::binary_function<std::pair<std::type_info*, T>,
- std::pair<std::type_info*, T>,
- bool>
- {
- bool operator()(const std::pair<std::type_info*, T>& lhs,
- const std::pair<std::type_info*, T>& rhs) const
- {
- return lhs.first->before(*rhs.first);
- }
- };
-
- // Same as above, but with const std::type_info*.
- template <typename T>
- struct less< std::pair<const std::type_info*, T> >:
- public std::binary_function<std::pair<const std::type_info*, T>,
- std::pair<const std::type_info*, T>,
- bool>
- {
- bool operator()(const std::pair<const std::type_info*, T>& lhs,
- const std::pair<const std::type_info*, T>& rhs) const
- {
- return lhs.first->before(*rhs.first);
- }
- };
-
- PairVector mVector;
-};
-
-#endif /* ! defined(LL_LLSORTEDVECTOR_H) */