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85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
//===- Sequence.h - Utility for producing sequences of values ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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/// \file
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/// This routine provides some synthesis utilities to produce sequences of
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/// values. The names are intentionally kept very short as they tend to occur
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/// in common and widely used contexts.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_SEQUENCE_H
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#define LLVM_ADT_SEQUENCE_H
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#include "llvm/ADT/iterator.h"
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#include "llvm/ADT/iterator_range.h"
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#include <algorithm>
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#include <iterator>
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#include <utility>
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namespace llvm {
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namespace detail {
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template <typename ValueT>
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class value_sequence_iterator
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: public iterator_facade_base<value_sequence_iterator<ValueT>,
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std::random_access_iterator_tag,
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const ValueT> {
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using BaseT = typename value_sequence_iterator::iterator_facade_base;
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ValueT Value;
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public:
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using difference_type = typename BaseT::difference_type;
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using reference = typename BaseT::reference;
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value_sequence_iterator() = default;
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value_sequence_iterator(const value_sequence_iterator &) = default;
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value_sequence_iterator(value_sequence_iterator &&Arg)
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: Value(std::move(Arg.Value)) {}
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template <typename U, typename Enabler = decltype(ValueT(std::declval<U>()))>
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value_sequence_iterator(U &&Value) : Value(std::forward<U>(Value)) {}
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value_sequence_iterator &operator+=(difference_type N) {
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Value += N;
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return *this;
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}
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value_sequence_iterator &operator-=(difference_type N) {
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Value -= N;
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return *this;
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}
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using BaseT::operator-;
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difference_type operator-(const value_sequence_iterator &RHS) const {
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return Value - RHS.Value;
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}
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bool operator==(const value_sequence_iterator &RHS) const {
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return Value == RHS.Value;
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}
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bool operator<(const value_sequence_iterator &RHS) const {
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return Value < RHS.Value;
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}
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reference operator*() const { return Value; }
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};
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} // end namespace detail
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template <typename ValueT>
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iterator_range<detail::value_sequence_iterator<ValueT>> seq(ValueT Begin,
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ValueT End) {
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return make_range(detail::value_sequence_iterator<ValueT>(Begin),
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detail::value_sequence_iterator<ValueT>(End));
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}
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} // end namespace llvm
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#endif // LLVM_ADT_SEQUENCE_H
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