277a31f0ae
Some methods of managed_bytes contain the logic needed to read/write the
contents of managed_bytes, even though this logic is already present in
managed_bytes_{,mutable}_view.
Reimplementing those methods by using the views as intermediates allows us to
remove some code and makes the responsibilities cleaner -- after the change,
managed_bytes contains the logic of allocating and freeing the storage,
while views provide read/write access to the storage.
This change will simplify the next patch which changes the internals of
managed_bytes.
65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
/*
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* Copyright (C) 2017-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <string_view>
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#include <seastar/core/sstring.hh>
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#include "seastarx.hh"
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template<typename CharT>
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class basic_mutable_view {
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CharT* _begin = nullptr;
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CharT* _end = nullptr;
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public:
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using value_type = CharT;
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using pointer = CharT*;
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using iterator = CharT*;
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using const_iterator = CharT*;
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basic_mutable_view() = default;
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template<typename U, U N>
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basic_mutable_view(basic_sstring<CharT, U, N>& str)
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: _begin(str.begin())
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, _end(str.end())
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{ }
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basic_mutable_view(CharT* ptr, size_t length)
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: _begin(ptr)
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, _end(ptr + length)
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{ }
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operator std::basic_string_view<CharT>() const noexcept {
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return std::basic_string_view<CharT>(begin(), size());
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}
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CharT& operator[](size_t idx) const { return _begin[idx]; }
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iterator begin() const { return _begin; }
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iterator end() const { return _end; }
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CharT* data() const { return _begin; }
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size_t size() const { return _end - _begin; }
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bool empty() const { return _begin == _end; }
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CharT& front() const { return *_begin; }
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void remove_prefix(size_t n) {
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_begin += n;
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}
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void remove_suffix(size_t n) {
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_end -= n;
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}
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basic_mutable_view substr(size_t pos, size_t count) {
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size_t n = std::min(count, (_end - _begin) - pos);
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return basic_mutable_view{_begin + pos, n};
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}
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};
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