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Diffstat (limited to 'include/llvm/ADT/Sequence.h')
-rw-r--r-- | include/llvm/ADT/Sequence.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/include/llvm/ADT/Sequence.h b/include/llvm/ADT/Sequence.h new file mode 100644 index 000000000000..5d36831cc128 --- /dev/null +++ b/include/llvm/ADT/Sequence.h @@ -0,0 +1,79 @@ +//===- Sequence.h - Utility for producing sequences of values ---*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +/// \file +/// This routine provides some synthesis utilities to produce sequences of +/// values. The names are intentionally kept very short as they tend to occur +/// in common and widely used contexts. +/// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_ADT_SEQ_H +#define LLVM_ADT_SEQ_H + +#include "llvm/ADT/iterator.h" +#include "llvm/ADT/iterator_range.h" + +namespace llvm { + +namespace detail { +template <typename ValueT> +class value_sequence_iterator + : public iterator_facade_base<value_sequence_iterator<ValueT>, + std::random_access_iterator_tag, + const ValueT> { + typedef typename value_sequence_iterator::iterator_facade_base BaseT; + + ValueT Value; + +public: + typedef typename BaseT::difference_type difference_type; + typedef typename BaseT::reference reference; + + value_sequence_iterator() = default; + value_sequence_iterator(const value_sequence_iterator &) = default; + value_sequence_iterator(value_sequence_iterator &&Arg) + : Value(std::move(Arg.Value)) {} + + template <typename U, typename Enabler = decltype(ValueT(std::declval<U>()))> + value_sequence_iterator(U &&Value) : Value(std::forward<U>(Value)) {} + + value_sequence_iterator &operator+=(difference_type N) { + Value += N; + return *this; + } + value_sequence_iterator &operator-=(difference_type N) { + Value -= N; + return *this; + } + using BaseT::operator-; + difference_type operator-(const value_sequence_iterator &RHS) const { + return Value - RHS.Value; + } + + bool operator==(const value_sequence_iterator &RHS) const { + return Value == RHS.Value; + } + bool operator<(const value_sequence_iterator &RHS) const { + return Value < RHS.Value; + } + + reference operator*() const { return Value; } +}; +} // End detail namespace. + +template <typename ValueT> +iterator_range<detail::value_sequence_iterator<ValueT>> seq(ValueT Begin, + ValueT End) { + return make_range(detail::value_sequence_iterator<ValueT>(Begin), + detail::value_sequence_iterator<ValueT>(End)); +} + +} + +#endif |