The multi-index container holding every mempool entry.
Declared in <txmempool.h>
[[guarded_by(0x7fb95f5550a8), guarded_by(0x7fb968bc67b8), guarded_by(0x7fb95fdd05f8), guarded_by(0x7fb978b759b8), guarded_by(0x7fb96b8faf18), guarded_by(0x7fb96e5c19e8), guarded_by(0x7fb97a07ba18), guarded_by(0x7fb96be43768)]]
indexed_transaction_set mapTx;