CCoinsCacheEntry Struct Reference

A Coin in one level of the coins database caching hierarchy. More...

#include <coins.h>

Collaboration diagram for CCoinsCacheEntry:

Public Types
enum	Flags { DIRTY = (1 << 0) , FRESH = (1 << 1) }

Public Member Functions
	CCoinsCacheEntry ()
	CCoinsCacheEntry (Coin coinIn)
	CCoinsCacheEntry (Coin &&coin_, uint8_t flag)

Public Attributes
Coin	coin
uint8_t	flags

Detailed Description

A Coin in one level of the coins database caching hierarchy.

A coin can either be:

• unspent or spent (in which case the Coin object will be nulled out - see Coin.Clear())
• DIRTY or not DIRTY
• FRESH or not FRESH

Out of these 2^3 = 8 states, only some combinations are valid:

• unspent, FRESH, DIRTY (e.g. a new coin created in the cache)
• unspent, not FRESH, DIRTY (e.g. a coin changed in the cache during a reorg)
• unspent, not FRESH, not DIRTY (e.g. an unspent coin fetched from the parent cache)
• spent, FRESH, not DIRTY (e.g. a spent coin fetched from the parent cache)
• spent, not FRESH, DIRTY (e.g. a coin is spent and spentness needs to be flushed to the parent)

Definition at line 91 of file coins.h.

Member Enumeration Documentation

Flags

enum CCoinsCacheEntry::Flags

Enumerator
DIRTY	DIRTY means the CCoinsCacheEntry is potentially different from the version in the parent cache. Failure to mark a coin as DIRTY when it is potentially different from the parent cache will cause a consensus failure, since the coin's state won't get written to the parent when the cache is flushed.
FRESH	FRESH means the parent cache does not have this coin or that it is a spent coin in the parent cache. If a FRESH coin in the cache is later spent, it can be deleted entirely and doesn't ever need to be flushed to the parent. This is a performance optimization. Marking a coin as FRESH when it exists unspent in the parent cache will cause a consensus failure, since it might not be deleted from the parent when this cache is flushed.

Definition at line 96 of file coins.h.

Constructor & Destructor Documentation

CCoinsCacheEntry() [1/3]

CCoinsCacheEntry::CCoinsCacheEntry ( )

inline

Definition at line 117 of file coins.h.

CCoinsCacheEntry() [2/3]

CCoinsCacheEntry::CCoinsCacheEntry ( Coin  coinIn )

inlineexplicit

Definition at line 118 of file coins.h.

CCoinsCacheEntry() [3/3]

CCoinsCacheEntry::CCoinsCacheEntry ( Coin &&  coin_, uint8_t  flag  )

inline

Definition at line 120 of file coins.h.

Member Data Documentation

coin

Coin CCoinsCacheEntry::coin

Definition at line 93 of file coins.h.

flags

uint8_t CCoinsCacheEntry::flags

Definition at line 94 of file coins.h.

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

• src/coins.h