Lazy mpz allocation

[Torbjörn Granlund]

Marc Glisse <marc.glisse at inria.fr> writes:

  the function mpz_init could now be marked __GMP_NOTHROW. Do we want to
  do it? I could then propagate the change to the C++ wrapper, which
  would have a significant impact on the performance of
  std::vector<mpz_class> for instance. On the other hand, this is a
  promise in the interface, going back to a throwing mpz_init would be
  an ABI break.

I'd say that we should go ahead and declare it __GMP_NOTHROW.

-- 
Torbjörn
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