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bool bneijt::Source::changed ( std::string const &  substituteOutput  )  const

Return wether this source has changed since last seen.

This is a helper function, introduced with the MD5 sum checking. It returns wether this source changed since last run. If we don't use md5 hashing, we need a substitute output file to check the modtime against for when the source doesn't produce output.

substituteOutput A filename to use the modtime from if this doesn't output anything.
true when the source changed since last seen.

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