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_SEQUENCE_H 17 #define LLVM_ADT_SEQUENCE_H 18 19 #include "llvm/ADT/iterator.h" 20 #include "llvm/ADT/iterator_range.h" 21 #include <algorithm> 22 #include <iterator> 23 #include <utility> 24 25 namespace llvm { 26 27 namespace detail { 28 29 template <typename ValueT> 30 class value_sequence_iterator 31 : public iterator_facade_base<value_sequence_iterator<ValueT>, 32 std::random_access_iterator_tag, 33 const ValueT> { 34 using BaseT = typename value_sequence_iterator::iterator_facade_base; 35 36 ValueT Value; 37 38 public: 39 using difference_type = typename BaseT::difference_type; 40 using reference = typename BaseT::reference; 41 42 value_sequence_iterator() = default; 43 value_sequence_iterator(const value_sequence_iterator &) = default; 44 value_sequence_iterator(value_sequence_iterator &&Arg) 45 : Value(std::move(Arg.Value)) {} 46 47 template <typename U, typename Enabler = decltype(ValueT(std::declval<U>()))> 48 value_sequence_iterator(U &&Value) : Value(std::forward<U>(Value)) {} 49 50 value_sequence_iterator &operator+=(difference_type N) { 51 Value += N; 52 return *this; 53 } 54 value_sequence_iterator &operator-=(difference_type N) { 55 Value -= N; 56 return *this; 57 } 58 using BaseT::operator-; 59 difference_type operator-(const value_sequence_iterator &RHS) const { 60 return Value - RHS.Value; 61 } 62 63 bool operator==(const value_sequence_iterator &RHS) const { 64 return Value == RHS.Value; 65 } 66 bool operator<(const value_sequence_iterator &RHS) const { 67 return Value < RHS.Value; 68 } 69 70 reference operator*() const { return Value; } 71 }; 72 73 } // end namespace detail 74 75 template <typename ValueT> 76 iterator_range<detail::value_sequence_iterator<ValueT>> seq(ValueT Begin, 77 ValueT End) { 78 return make_range(detail::value_sequence_iterator<ValueT>(Begin), 79 detail::value_sequence_iterator<ValueT>(End)); 80 } 81 82 } // end namespace llvm 83 84 #endif // LLVM_ADT_SEQUENCE_H 85
