I'm contemplating adding a dependency to OpenSSL for computing hashes of things like element signatures.
This is what breaks Kristian's code. Comparing element pointers does not work since the UFC class creates its own elements which are different from the ones existing in FunctionSpace classes. Would there be any difficulties with depending on OpenSSL? Are there simpler alternatives for a function that takes a string a returns a message digest like the SHA1 function in OpenSSL? -- Anders
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