Bitcoin Core  22.99.0
P2P Digital Currency
Public Member Functions | Protected Attributes | Private Attributes | List of all members
CCoinsViewMemPool Class Reference

CCoinsView that brings transactions from a mempool into view. More...

#include <txmempool.h>

Inheritance diagram for CCoinsViewMemPool:
Collaboration diagram for CCoinsViewMemPool:

Public Member Functions

 CCoinsViewMemPool (CCoinsView *baseIn, const CTxMemPool &mempoolIn)
bool GetCoin (const COutPoint &outpoint, Coin &coin) const override
 Retrieve the Coin (unspent transaction output) for a given outpoint. More...
void PackageAddTransaction (const CTransactionRef &tx)
 Add the coins created by this transaction. More...
- Public Member Functions inherited from CCoinsViewBacked
 CCoinsViewBacked (CCoinsView *viewIn)
bool HaveCoin (const COutPoint &outpoint) const override
 Just check whether a given outpoint is unspent. More...
uint256 GetBestBlock () const override
 Retrieve the block hash whose state this CCoinsView currently represents. More...
std::vector< uint256GetHeadBlocks () const override
 Retrieve the range of blocks that may have been only partially written. More...
void SetBackend (CCoinsView &viewIn)
bool BatchWrite (CCoinsMap &mapCoins, const uint256 &hashBlock) override
 Do a bulk modification (multiple Coin changes + BestBlock change). More...
std::unique_ptr< CCoinsViewCursorCursor () const override
 Get a cursor to iterate over the whole state. More...
size_t EstimateSize () const override
 Estimate database size (0 if not implemented) More...
- Public Member Functions inherited from CCoinsView
virtual ~CCoinsView ()
 As we use CCoinsViews polymorphically, have a virtual destructor. More...

Protected Attributes

const CTxMemPoolmempool
- Protected Attributes inherited from CCoinsViewBacked

Private Attributes

std::unordered_map< COutPoint, Coin, SaltedOutpointHasherm_temp_added
 Coins made available by transactions being validated. More...

Detailed Description

CCoinsView that brings transactions from a mempool into view.

It does not check for spendings by memory pool transactions. Instead, it provides access to all Coins which are either unspent in the base CCoinsView, are outputs from any mempool transaction, or are tracked temporarily to allow transaction dependencies in package validation. This allows transaction replacement to work as expected, as you want to have all inputs "available" to check signatures, and any cycles in the dependency graph are checked directly in AcceptToMemoryPool. It also allows you to sign a double-spend directly in signrawtransactionwithkey and signrawtransactionwithwallet, as long as the conflicting transaction is not yet confirmed.

Definition at line 892 of file txmempool.h.

Constructor & Destructor Documentation

◆ CCoinsViewMemPool()

CCoinsViewMemPool::CCoinsViewMemPool ( CCoinsView baseIn,
const CTxMemPool mempoolIn 

Definition at line 1003 of file txmempool.cpp.

Member Function Documentation

◆ GetCoin()

bool CCoinsViewMemPool::GetCoin ( const COutPoint outpoint,
Coin coin 
) const

Retrieve the Coin (unspent transaction output) for a given outpoint.

Returns true only when an unspent coin was found, which is returned in coin. When false is returned, coin's value is unspecified.

Reimplemented from CCoinsViewBacked.

Definition at line 1005 of file txmempool.cpp.

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◆ PackageAddTransaction()

void CCoinsViewMemPool::PackageAddTransaction ( const CTransactionRef tx)

Add the coins created by this transaction.

These coins are only temporarily stored in m_temp_added and cannot be flushed to the back end. Only used for package validation.

Definition at line 1028 of file txmempool.cpp.

Member Data Documentation

◆ m_temp_added

std::unordered_map<COutPoint, Coin, SaltedOutpointHasher> CCoinsViewMemPool::m_temp_added

Coins made available by transactions being validated.

Tracking these allows for package validation, since we can access transaction outputs without submitting them to mempool.

Definition at line 898 of file txmempool.h.

◆ mempool

const CTxMemPool& CCoinsViewMemPool::mempool

Definition at line 900 of file txmempool.h.

The documentation for this class was generated from the following files: