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//===- Sequence.h - Utility for producing sequences of values ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \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_SEQUENCE_H
#define LLVM_ADT_SEQUENCE_H
#include "llvm/ADT/iterator.h"
#include "llvm/ADT/iterator_range.h"
#include <algorithm>
#include <iterator>
#include <utility>
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> {
using BaseT = typename value_sequence_iterator::iterator_facade_base;
ValueT Value;
public:
using difference_type = typename BaseT::difference_type;
using reference = typename BaseT::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)) {}
value_sequence_iterator &operator=(const value_sequence_iterator &Arg) {
Value = Arg.Value;
return *this;
}
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 namespace detail
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));
}
} // end namespace llvm
#endif // LLVM_ADT_SEQUENCE_H
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