Merge #10685: Clarify CCoinsViewMemPool documentation.

381b8fc36 Clarify CCoinsViewMemPool documentation. (Matt Corallo)

Tree-SHA512: 0d1520595a03ea4038b4119871d79dfc28a50f42ac7667b30a583805d4fe4b0480a6912b9b4f7660c7223778ef85f2f9d1870551383a35c5e8c88cd2935f59d3

1 files changed, 7 insertions, 0 deletions

diff --git a/src/txmempool.h b/src/txmempool.h
index be9e83eb4b..d272114a7c 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -669,6 +669,13 @@ private:
 /** 
  * CCoinsView that brings transactions from a memorypool 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, or are outputs from any mempool transaction!
+ * 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 signrawtransaction,
+ * as long as the conflicting transaction is not yet confirmed.
  */
 class CCoinsViewMemPool : public CCoinsViewBacked
 {