blob: b325e42743fb28622ca624d89e5e521547aaf9da (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
// This is based on the following:
//===- 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 CompactSet class.
//
//===----------------------------------------------------------------------===//
#pragma once
#include "compact_vector.h"
#include <cstddef>
#include <iterator>
#include <set>
#include <type_traits>
namespace NYT {
///////////////////////////////////////////////////////////////////////////////
//! 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, size_t N, typename C = std::less<T>>
class TCompactSet
{
public:
class const_iterator;
using size_type = std::size_t;
using key_type = T;
[[nodiscard]] bool empty() const;
size_type size() const;
const T& front() const;
size_type count(const T& v) const;
bool contains(const T& v) const;
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:
// Use a TCompactVector 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;
bool is_small() const;
};
///////////////////////////////////////////////////////////////////////////////
} // namespace NYT
#define COMPACT_SET_INL_H_
#include "compact_set-inl.h"
#undef COMPACT_SET_INL_H_
|
