Make integer exponentiation methods unstably const #68978
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r? @cramertj (rust_highfive has picked a reviewer for you, use r? to override) |
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I believe the previous code was calling `ops::Add::add` instead of the `+` operator to get this behavior.
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r? @oli-obk |
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lgtm, we should remove the macro at some point, but that's not really a problem to leave around until someone discovers it. I also don't know about the panic situation in that function. r=me with @scottmcm 's approval on that panic "change" |
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I have no horse in this race; I added it because I was asked to do so by @kennytm in #45754 (comment) AFAIK that's just a matter of "use fewer So I think that means |
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…-obk Make integer exponentiation methods unstably const cc rust-lang#53718 This makes the following inherent methods on integer primitives into unstable `const fn`: - `pow` - `checked_pow` - `wrapping_pow` - `overflowing_pow` - `saturating_pow` - `next_power_of_two` - `checked_next_power_of_two` - `wrapping_next_power_of_two` Only two changes were made to the implementation of these methods. First, I had to switch from the `?` operator, which is not yet implemented in a const context, to a `try_opt` macro. Second, `next_power_of_two` was using `ops::Add::add` (see the first commit) to "get overflow checks", so I switched to `#[rustc_inherit_overflow_checks]`. I'm not quite sure why the attribute wasn't used in the first place.
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Rollup of 5 pull requests Successful merges: - #68705 (Add LinkedList::remove()) - #68945 (Stabilize Once::is_completed) - #68978 (Make integer exponentiation methods unstably const) - #69266 (Fix race condition when allocating source files in SourceMap) - #69287 (Clean up E0317 explanation) Failed merges: r? @ghost
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cc #53718
This makes the following inherent methods on integer primitives into unstable
const fn:powchecked_powwrapping_powoverflowing_powsaturating_pownext_power_of_twochecked_next_power_of_twowrapping_next_power_of_twoOnly two changes were made to the implementation of these methods. First, I had to switch from the
?operator, which is not yet implemented in a const context, to atry_optmacro. Second,next_power_of_twowas usingops::Add::add(see the first commit) to "get overflow checks", so I switched to#[rustc_inherit_overflow_checks]. I'm not quite sure why the attribute wasn't used in the first place.