range_input.hpp

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// Copyright (C) 2020-2023 Jonathan Müller and lexy contributors
// SPDX-License-Identifier: BSL-1.0
 
#ifndef LEXY_INPUT_RANGE_INPUT_HPP_INCLUDED
#define LEXY_INPUT_RANGE_INPUT_HPP_INCLUDED
 
#include <lexy/error.hpp>
#include <lexy/input/base.hpp>
#include <lexy/lexeme.hpp>
 
namespace lexy
{
template <typename Encoding, typename Iterator, typename Sentinel = Iterator>
class range_input
{
public:
    using encoding  = Encoding;
    using char_type = typename encoding::char_type;
 
    using iterator = Iterator;
    using sentinel = Sentinel;
 
    //=== constructors ===//
    constexpr range_input() noexcept : _begin(), _end() {}
 
    constexpr range_input(iterator begin, sentinel end) noexcept : _begin(begin), _end(end) {}
 
    //=== access ===//
    constexpr iterator begin() const noexcept
    {
        return _begin;
    }
 
    constexpr sentinel end() const noexcept
    {
        return _end;
    }
 
    //=== reader ===//
    constexpr auto reader() const& noexcept
    {
        return _range_reader<Encoding>(_begin, _end);
    }
 
private:
    Iterator                   _begin;
    LEXY_EMPTY_MEMBER Sentinel _end;
};
 
template <typename Iterator, typename Sentinel>
range_input(Iterator begin, Sentinel end)
    -> range_input<deduce_encoding<LEXY_DECAY_DECLTYPE(*begin)>, Iterator, Sentinel>;
 
template <typename Encoding, typename Iterator, typename Sentinel>
constexpr bool input_is_view<range_input<Encoding, Iterator, Sentinel>> = true;
} // namespace lexy
 
#endif // LEXY_INPUT_RANGE_INPUT_HPP_INCLUDED