Neal Coombes 396ecf6021 Cache std::ostringstream between assertions.
This is not thread safe, but I think that was already true of Catch.
The construction/destruction of the std::ostringstream is where the
vast majority of time is spent per assertion.  A simple test of
100000000 CHECK()s is reduced from around 60s to 7.4s
2017-06-25 15:53:59 +02:00
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