LLVM  4.0.0
Sequence.h
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1 //===- Sequence.h - Utility for producing sequences of values ---*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 /// \file
10 /// This routine provides some synthesis utilities to produce sequences of
11 /// values. The names are intentionally kept very short as they tend to occur
12 /// in common and widely used contexts.
13 ///
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_ADT_SEQ_H
17 #define LLVM_ADT_SEQ_H
18 
19 #include "llvm/ADT/iterator.h"
21 
22 namespace llvm {
23 
24 namespace detail {
25 template <typename ValueT>
27  : public iterator_facade_base<value_sequence_iterator<ValueT>,
28  std::random_access_iterator_tag,
29  const ValueT> {
30  typedef typename value_sequence_iterator::iterator_facade_base BaseT;
31 
32  ValueT Value;
33 
34 public:
35  typedef typename BaseT::difference_type difference_type;
36  typedef typename BaseT::reference reference;
37 
38  value_sequence_iterator() = default;
41  : Value(std::move(Arg.Value)) {}
42 
43  template <typename U, typename Enabler = decltype(ValueT(std::declval<U>()))>
44  value_sequence_iterator(U &&Value) : Value(std::forward<U>(Value)) {}
45 
47  Value += N;
48  return *this;
49  }
51  Value -= N;
52  return *this;
53  }
54  using BaseT::operator-;
56  return Value - RHS.Value;
57  }
58 
59  bool operator==(const value_sequence_iterator &RHS) const {
60  return Value == RHS.Value;
61  }
62  bool operator<(const value_sequence_iterator &RHS) const {
63  return Value < RHS.Value;
64  }
65 
66  reference operator*() const { return Value; }
67 };
68 } // End detail namespace.
69 
70 template <typename ValueT>
72  ValueT End) {
75 }
76 
77 }
78 
79 #endif
bool operator<(const value_sequence_iterator &RHS) const
Definition: Sequence.h:62
BaseT::difference_type difference_type
Definition: Sequence.h:35
This provides a very simple, boring adaptor for a begin and end iterator into a range type...
value_sequence_iterator(value_sequence_iterator &&Arg)
Definition: Sequence.h:40
CRTP base class which implements the entire standard iterator facade in terms of a minimal subset of ...
Definition: iterator.h:65
difference_type operator-(const value_sequence_iterator &RHS) const
Definition: Sequence.h:55
value_sequence_iterator & operator-=(difference_type N)
Definition: Sequence.h:50
static const unsigned End
value_sequence_iterator & operator+=(difference_type N)
Definition: Sequence.h:46
iterator_range< T > make_range(T x, T y)
Convenience function for iterating over sub-ranges.
iterator_range< detail::value_sequence_iterator< ValueT > > seq(ValueT Begin, ValueT End)
Definition: Sequence.h:71
A range adaptor for a pair of iterators.
bool operator==(const value_sequence_iterator &RHS) const
Definition: Sequence.h:59
#define N
LLVM Value Representation.
Definition: Value.h:71