Making bignum optional allows skipping the rustc-serialize and rand
dependencies too, and it makes a big difference in num's build time.
With default (all) features, clean build time including dependencies: 27
seconds.
With no default features, clean build time including dependencies (none):
5 seconds.
If T is an unsigned integer type, these methods are guaranteed to
overflow unless the result is actually real, so we should disallow
them for the same reason that Neg was removed from these types.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Along the way, this commit also rationalizes the traits a bit more.
Moving to stable required vendoring a couple of minor things (notably,
radix formatting).
Now, arithmetic binary operator traits take operands by value,
but non-copyable types such as `BigUint` should not always moved out when
applying operators.
This commit implements these operators not only for bare structs also
these references.
By-value implementations are forwarded to by-reference implementations
for now. In the future, by-value implementations may be replaced with
more efficient implementations (for example, the implementation that
reuses moved buffers.)
mathematcs.
Import numeric traits and functions that were removed from the standard library.
This also implements `AdditiveIterator` and `MultiplicativeIterator` for
`BigUint` and `BigInt`.
closes#28
William Rieger
root
Anders Kaseorg
Aaron Turon
Darin Morrison
Alex Crichton
Huon Wilson
gifnksm
Sven Nilsen
Chase McCarthy