Check trivial multop equality at build time. The makes the
equal visitor useless, since two equals formulae will now share the same address. * src/ltlast/multop.hh (add_sorted): New function. (paircmp): New comparison functor. (map): Use paircmp, we want to compare the vectors' contents, not their addresses. * src/ltlast/multop.cc (add_sorted): New function. (add): Use it. * src/ltltest/equals.cc, src/ltltest/tostring.cc: Compare pointers instead of calling equal. * src/ltlvisit/equals.cc, src/ltlvisit/equals.hh: Delete. * src/ltlvisit/Makefile.am (libltlvisit_la_SOURCES): Remove equals.cc and equals.hh. * wrap/spot.i: Do not include equals.hh.
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