refactor: Use std::optional for event range end requested #790
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Previously,
SIZE_MAX
was used to indicate that the full available end range of an input file was to be used. This caused issues when no input file was present (for example in the geometry examples) and--events
was not given., since it would runSIZE_MAX
events (see #707).This PR changes this to use
std::optional<size_t>
, so that the default is clearly communicated. The geometry example should now default to1
if--events
isn't supplied.Fixes #707