KeyInfo Struct Reference

键信息结构，存储键的元数据 (Structure containing key metadata). More...

#include <layout.hpp>

Collaboration diagram for KeyInfo:

Public Member Functions
	KeyInfo ()
	构造一个默认可写的键头元数据 (Construct one default writable key-header metadata object).
void	SetNameLength (uint8_t len)
	设置键名长度 (Set the key name length).
uint8_t	GetNameLength () const
	获取键名长度 (Get the key name length).
void	SetDataSize (uint32_t size)
	设置数据字节数 (Set the payload size in bytes).
uint32_t	GetDataSize () const
	获取数据字节数 (Get the payload size in bytes).

Data Fields
BlockBoolData< MinWriteSize >	no_next_key
	是否是最后一个键
BlockBoolData< MinWriteSize >	available_flag
	该键是否有效
BlockBoolData< MinWriteSize >	uninit
	该键是否未初始化
uint32_t	raw_info

Detailed Description

键信息结构，存储键的元数据 (Structure containing key metadata).

Definition at line 105 of file layout.hpp.

Constructor & Destructor Documentation

KeyInfo()

KeyInfo::KeyInfo ( )

inline

构造一个默认可写的键头元数据 (Construct one default writable key-header metadata object).

Definition at line 119 of file layout.hpp.

  {
    BlockBoolUtil<MinWriteSize>::SetFlag(no_next_key, true);
    BlockBoolUtil<MinWriteSize>::SetFlag(available_flag, true);
    BlockBoolUtil<MinWriteSize>::SetFlag(uninit, true);
  }

Member Function Documentation

GetDataSize()

uint32_t KeyInfo::GetDataSize ( ) const

inline

获取数据字节数 (Get the payload size in bytes).

Returns

数据字节数 (Payload size in bytes).

Definition at line 154 of file layout.hpp.

{ return raw_info & 0x01FFFFFF; }

GetNameLength()

uint8_t KeyInfo::GetNameLength ( ) const

inline

获取键名长度 (Get the key name length).

Returns

键名长度 (Key name length).

Definition at line 139 of file layout.hpp.

{ return (raw_info >> 25) & 0x7F; }

SetDataSize()

void KeyInfo::SetDataSize ( uint32_t size )

inline

设置数据字节数 (Set the payload size in bytes).

Parameters

size	数据字节数 (Payload size in bytes).

Definition at line 145 of file layout.hpp.

  {
    raw_info = (raw_info & 0xFE000000) | (size & 0x01FFFFFF);
  }

SetNameLength()

void KeyInfo::SetNameLength ( uint8_t len )

inline

设置键名长度 (Set the key name length).

Parameters

len	键名长度 (Key name length).

Definition at line 130 of file layout.hpp.

  {
    raw_info = (raw_info & 0x01FFFFFF) | ((len & 0x7F) << 25);
  }

Field Documentation

available_flag

BlockBoolData<MinWriteSize> KeyInfo::available_flag

该键是否有效

Definition at line 108 of file layout.hpp.

no_next_key

BlockBoolData<MinWriteSize> KeyInfo::no_next_key

是否是最后一个键

Definition at line 107 of file layout.hpp.

raw_info

uint32_t KeyInfo::raw_info

Initial value:

=
      0

高 7 位保存 nameLength，低 25 位保存 dataSize。 Upper 7 bits store nameLength and lower 25 bits store dataSize.

Definition at line 111 of file layout.hpp.

uninit

BlockBoolData<MinWriteSize> KeyInfo::uninit

该键是否未初始化

Definition at line 109 of file layout.hpp.

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The documentation for this struct was generated from the following file:

• src/middleware/database/raw/layout.hpp