static bool fullEntryCompare(const MBoxEntry &a, const MBoxEntry &b) { return a.messageOffset() == b.messageOffset() && a.separatorSize() == b.separatorSize() && a.messageSize() == b.messageSize(); }
static bool lessThanByOffset( const MBoxEntry &left, const MBoxEntry &right ) { return left.messageOffset() < right.messageOffset(); }