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//===- llvm/ADT/SmallSet.h - 'Normally small' sets --------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the TCompactSet class.
//
//===----------------------------------------------------------------------===//
#pragma once
#include "compact_vector.h"
#include <util/system/yassert.h>
#include <cstddef>
#include <iterator>
#include <set>
#include <type_traits>
namespace NYT {
/// TCompactSet - This maintains a set of unique values, optimizing for the case
/// when the set is small (less than N). In this case, the set can be
/// maintained with no mallocs. If the set gets large, we expand to using an
/// std::set to maintain reasonable lookup times.
///
/// Note that any modification of the set may invalidate *all* iterators.
template <typename T, unsigned N, typename C = std::less<T>>
class TCompactSet
{
private:
/// Use a CompactVector to hold the elements here (even though it will never
/// reach its 'large' stage) to avoid calling the default ctors of elements
/// we will never use.
TCompactVector<T, N> Vector;
std::set<T, C> Set;
using TSetConstIterator = typename std::set<T, C>::const_iterator;
using TVectorConstIterator = typename TCompactVector<T, N>::const_iterator;
public:
class const_iterator;
using size_type = std::size_t;
TCompactSet() {}
[[nodiscard]] bool empty() const;
size_type size() const;
const T& front() const;
/// count - Return true if the element is in the set.
size_type count(const T& v) const;
/// insert - Insert an element into the set if it isn't already there.
std::pair<const_iterator, bool> insert(const T& v);
template <typename TIter>
void insert(TIter i, TIter e);
bool erase(const T& v);
void clear();
const_iterator begin() const;
const_iterator cbegin() const;
const_iterator end() const;
const_iterator cend() const;
private:
bool IsSmall() const;
};
} // namespace NYT
#define COMPACT_SET_INL_H_
#include "compact_set-inl.h"
#undef COMPACT_SET_INL_H_
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