I once made this "beauty" at work...
// Write
bool result = insert(results, data);
if ( m_CurrentSet )
{
result = result || insert(*m_CurrentSet, data);
}
The idea was to store the latest of anything that has been written to file in memory, to make sure the latest set of data was in memory. However, this being a real time application, which in theory should run forever (and generates data for a multi-million dollar service), the results were pretty poor.
No harm done, since this was in a test and not production.

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