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77248e8496
48840bfc2drefactor: Prefer `<=>` over multiple relational operators (Daniel Pfeifer)5a0f49bd26refactor: Remove all `operator!=` definitions (Daniel Pfeifer) Pull request description: Remove all `operator!=` definitions and provide `operator<=>` as a replacement where all relational comparison operators were defined before. The compiler is able to deduce missing comparison operators from `operator!=` and `operator<=>`. The compiler provided operators have the following advantages: 1. less code 2. guaranteed consistency Refactoring that changes the implementation, or replaces it with `= default` is left for a separate PR. ACKs for top commit: optout21: utACK48840bfc2dChand-ra: tACK [`48840bf`](48840bfc2d). Built the PR and ran unit tests; everything passes. maflcko: review ACK48840bfc2d🌖 stickies-v: utACK48840bfc2d. Pretty straightforward cleanup taking advantage of C++20 improvements, nice. janb84: ACK48840bfc2dsipa: ACK48840bfc2dTree-SHA512: 7fedc4abc451c7ad611e3a960ff939a35580667222009cb30ca546e564dc9161e3e8d4d1d7d44c538d961cc8f7adba6e6dbcebcd1be370bf33aef294d06f236b
86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2020 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_FLATFILE_H
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#define BITCOIN_FLATFILE_H
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#include <string>
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#include <serialize.h>
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#include <util/fs.h>
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struct FlatFilePos
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{
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int32_t nFile{-1};
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uint32_t nPos{0};
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SERIALIZE_METHODS(FlatFilePos, obj) { READWRITE(VARINT_MODE(obj.nFile, VarIntMode::NONNEGATIVE_SIGNED), VARINT(obj.nPos)); }
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FlatFilePos() = default;
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FlatFilePos(int32_t nFileIn, uint32_t nPosIn)
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: nFile{nFileIn},
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nPos{nPosIn}
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{}
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friend bool operator==(const FlatFilePos &a, const FlatFilePos &b) {
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return (a.nFile == b.nFile && a.nPos == b.nPos);
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}
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bool IsNull() const { return (nFile == -1); }
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std::string ToString() const;
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};
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/**
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* FlatFileSeq represents a sequence of numbered files storing raw data. This class facilitates
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* access to and efficient management of these files.
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*/
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class FlatFileSeq
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{
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private:
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const fs::path m_dir;
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const char* const m_prefix;
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const size_t m_chunk_size;
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public:
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/**
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* Constructor
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*
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* @param dir The base directory that all files live in.
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* @param prefix A short prefix given to all file names.
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* @param chunk_size Disk space is pre-allocated in multiples of this amount.
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*/
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FlatFileSeq(fs::path dir, const char* prefix, size_t chunk_size);
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/** Get the name of the file at the given position. */
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fs::path FileName(const FlatFilePos& pos) const;
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/** Open a handle to the file at the given position. */
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FILE* Open(const FlatFilePos& pos, bool read_only = false) const;
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/**
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* Allocate additional space in a file after the given starting position. The amount allocated
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* will be the minimum multiple of the sequence chunk size greater than add_size.
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*
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* @param[in] pos The starting position that bytes will be allocated after.
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* @param[in] add_size The minimum number of bytes to be allocated.
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* @param[out] out_of_space Whether the allocation failed due to insufficient disk space.
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* @return The number of bytes successfully allocated.
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*/
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size_t Allocate(const FlatFilePos& pos, size_t add_size, bool& out_of_space) const;
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/**
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* Commit a file to disk, and optionally truncate off extra pre-allocated bytes if final.
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*
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* @param[in] pos The first unwritten position in the file to be flushed.
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* @param[in] finalize True if no more data will be written to this file.
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* @return true on success, false on failure.
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*/
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bool Flush(const FlatFilePos& pos, bool finalize = false) const;
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};
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#endif // BITCOIN_FLATFILE_H
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