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Mark constructor of BinaryHeap
as const fn
#117316
Conversation
Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @joshtriplett (or someone else) soon. Please see the contribution instructions for more information. Namely, in order to ensure the minimum review times lag, PR authors and assigned reviewers should ensure that the review label (
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Thank you!
@bors r+ |
…tor, r=dtolnay Mark constructor of `BinaryHeap` as const fn rust-lang#112353
…kingjubilee Rollup of 8 pull requests Successful merges: - rust-lang#115773 (tvOS simulator support on Apple Silicon for rustc) - rust-lang#117162 (Remove `cfg_match` from the prelude) - rust-lang#117170 (Add support for i586-unknown-netbsd as target.) - rust-lang#117259 (Declare rustc_target's dependency on object/macho) - rust-lang#117311 (-Zunpretty help: add missing possible values) - rust-lang#117316 (Mark constructor of `BinaryHeap` as const fn) - rust-lang#117319 (explain why we don't inline when target features differ) - rust-lang#117325 (Small ty::print cleanups) r? `@ghost` `@rustbot` modify labels: rollup
…kingjubilee Rollup of 5 pull requests Successful merges: - rust-lang#115773 (tvOS simulator support on Apple Silicon for rustc) - rust-lang#117162 (Remove `cfg_match` from the prelude) - rust-lang#117311 (-Zunpretty help: add missing possible values) - rust-lang#117316 (Mark constructor of `BinaryHeap` as const fn) - rust-lang#117319 (explain why we don't inline when target features differ) r? `@ghost` `@rustbot` modify labels: rollup
Rollup merge of rust-lang#117316 - Coekjan:const-binary-heap-constructor, r=dtolnay Mark constructor of `BinaryHeap` as const fn rust-lang#112353
#[must_use] | ||
pub fn new() -> BinaryHeap<T> { | ||
pub const fn new() -> BinaryHeap<T> { | ||
BinaryHeap { data: vec![] } |
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if you use Vec::new()
here, then BinaryHeap::new
can become const stable. vec![]
goes through a code path that assumes it needs to allocate.
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Perhaps I should have marked constification of new
and new_in
as different features, which may helps to stablize const new
function.
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rust/library/alloc/src/macros.rs
Lines 42 to 57 in bbcc169
macro_rules! vec { | |
() => ( | |
$crate::__rust_force_expr!($crate::vec::Vec::new()) | |
); | |
($elem:expr; $n:expr) => ( | |
$crate::__rust_force_expr!($crate::vec::from_elem($elem, $n)) | |
); | |
($($x:expr),+ $(,)?) => ( | |
$crate::__rust_force_expr!(<[_]>::into_vec( | |
// This rustc_box is not required, but it produces a dramatic improvement in compile | |
// time when constructing arrays with many elements. | |
#[rustc_box] | |
$crate::boxed::Box::new([$($x),+]) | |
)) | |
); | |
} |
It seems that the macro vec![]
(nothing filled within the bracket) just expands into Vec::new()
without allocator.
Thus, constification of BinaryHeap::new
is able to be stablized, if the new
function does not share the mark rust_const_unstable(feature = "const_binary_heap_constructor")
with BinaryHeap::new_in
.
74: Automated pull from upstream `master` r=tshepang a=github-actions[bot] This PR pulls the following changes from the upstream repository: * rust-lang/rust#117363 * rust-lang/rust#116405 * rust-lang/rust#117415 * rust-lang/rust#117414 * rust-lang/rust#117411 * rust-lang/rust#117403 * rust-lang/rust#117398 * rust-lang/rust#117396 * rust-lang/rust#117389 * rust-lang/rust#116862 * rust-lang/rust#117405 * rust-lang/rust#117395 * rust-lang/rust#117390 * rust-lang/rust#117383 * rust-lang/rust#117376 * rust-lang/rust#117370 * rust-lang/rust#117357 * rust-lang/rust#117356 * rust-lang/rust#117317 * rust-lang/rust#117132 * rust-lang/rust#117068 * rust-lang/rust#112463 * rust-lang/rust#117267 * rust-lang/rust#116939 * rust-lang/rust#117387 * rust-lang/rust#117385 * rust-lang/rust#117382 * rust-lang/rust#117371 * rust-lang/rust#117365 * rust-lang/rust#117350 * rust-lang/rust#117205 * rust-lang/rust#117177 * rust-lang/rust#117147 * rust-lang/rust#116485 * rust-lang/rust#117328 * rust-lang/rust#117332 * rust-lang/rust#117089 * rust-lang/rust#116733 * rust-lang/rust#116889 * rust-lang/rust#116270 * rust-lang/rust#117354 * rust-lang/rust#117337 * rust-lang/rust#117312 * rust-lang/rust#117082 * rust-lang/rust#117043 * rust-lang/rust#115968 * rust-lang/rust#117336 * rust-lang/rust#117325 * rust-lang/rust#117322 * rust-lang/rust#117259 * rust-lang/rust#117170 * rust-lang/rust#117335 * rust-lang/rust#117319 * rust-lang/rust#117316 * rust-lang/rust#117311 * rust-lang/rust#117162 * rust-lang/rust#115773 * rust-lang/rust#116447 * rust-lang/rust#117149 * rust-lang/rust#116240 * rust-lang/rust#117123 * rust-lang/rust#81746 * rust-lang/rust#117038 * rust-lang/rust#116609 * rust-lang/rust#117309 * rust-lang/rust#117277 * rust-lang/rust#117268 * rust-lang/rust#117256 * rust-lang/rust#117025 * rust-lang/rust#116945 * rust-lang/rust#116816 * rust-lang/rust#116739 * rust-lang/rust#116534 * rust-lang/rust#117253 * rust-lang/rust#117302 * rust-lang/rust#117197 * rust-lang/rust#116471 * rust-lang/rust#117294 * rust-lang/rust#117287 * rust-lang/rust#117281 * rust-lang/rust#117270 * rust-lang/rust#117247 * rust-lang/rust#117246 * rust-lang/rust#117212 * rust-lang/rust#116834 * rust-lang/rust#103208 * rust-lang/rust#117166 * rust-lang/rust#116751 * rust-lang/rust#116858 * rust-lang/rust#117272 * rust-lang/rust#117266 * rust-lang/rust#117262 * rust-lang/rust#117241 * rust-lang/rust#117240 * rust-lang/rust#116868 * rust-lang/rust#114998 * rust-lang/rust#116205 * rust-lang/rust#117260 * rust-lang/rust#116035 * rust-lang/rust#113183 * rust-lang/rust#117249 * rust-lang/rust#117243 * rust-lang/rust#117188 * rust-lang/rust#117114 * rust-lang/rust#117106 * rust-lang/rust#117032 * rust-lang/rust#116968 * rust-lang/rust#116581 * rust-lang/rust#117228 * rust-lang/rust#117221 * rust-lang/rust#117214 * rust-lang/rust#117207 * rust-lang/rust#117202 * rust-lang/rust#117194 * rust-lang/rust#117143 * rust-lang/rust#117095 * rust-lang/rust#116905 * rust-lang/rust#117171 * rust-lang/rust#113262 * rust-lang/rust#112875 * rust-lang/rust#116983 * rust-lang/rust#117148 * rust-lang/rust#117115 * rust-lang/rust#116818 * rust-lang/rust#115872 * rust-lang/rust#117193 * rust-lang/rust#117175 * rust-lang/rust#117009 * rust-lang/rust#117008 * rust-lang/rust#116931 * rust-lang/rust#116553 * rust-lang/rust#116401 * rust-lang/rust#117180 * rust-lang/rust#117173 * rust-lang/rust#117163 * rust-lang/rust#117159 * rust-lang/rust#117154 * rust-lang/rust#117152 * rust-lang/rust#117141 * rust-lang/rust#117111 * rust-lang/rust#117172 * rust-lang/rust#117168 * rust-lang/rust#117160 * rust-lang/rust#117158 * rust-lang/rust#117150 * rust-lang/rust#117136 * rust-lang/rust#117133 * rust-lang/rust#116801 * rust-lang/rust#117165 * rust-lang/rust#117113 * rust-lang/rust#117102 * rust-lang/rust#117076 * rust-lang/rust#116236 * rust-lang/rust#116993 * rust-lang/rust#117139 * rust-lang/rust#116482 * rust-lang/rust#115796 * rust-lang/rust#117135 * rust-lang/rust#117127 * rust-lang/rust#117010 * rust-lang/rust#116943 * rust-lang/rust#116841 * rust-lang/rust#116792 * rust-lang/rust#116714 * rust-lang/rust#116396 * rust-lang/rust#116094 * rust-lang/rust#117126 * rust-lang/rust#117105 * rust-lang/rust#117093 * rust-lang/rust#117092 * rust-lang/rust#117091 * rust-lang/rust#117081 * rust-lang/rust#116773 * rust-lang/rust#117124 * rust-lang/rust#116461 * rust-lang/rust#116435 * rust-lang/rust#116319 * rust-lang/rust#116238 * rust-lang/rust#116998 * rust-lang/rust#116300 * rust-lang/rust#117103 * rust-lang/rust#117086 * rust-lang/rust#117074 * rust-lang/rust#117070 * rust-lang/rust#117046 * rust-lang/rust#116859 * rust-lang/rust#107159 * rust-lang/rust#116033 * rust-lang/rust#107009 * rust-lang/rust#117087 * rust-lang/rust#117073 * rust-lang/rust#117064 * rust-lang/rust#117040 * rust-lang/rust#116978 * rust-lang/rust#116960 * rust-lang/rust#116837 * rust-lang/rust#116835 * rust-lang/rust#116849 * rust-lang/rust#117071 * rust-lang/rust#117069 * rust-lang/rust#117051 * rust-lang/rust#117049 * rust-lang/rust#117044 * rust-lang/rust#117042 * rust-lang/rust#105666 * rust-lang/rust#116606 * rust-lang/rust#117066 * rust-lang/rust#115324 * rust-lang/rust#117062 * rust-lang/rust#117000 * rust-lang/rust#117007 * rust-lang/rust#117018 * rust-lang/rust#116256 * rust-lang/rust#117041 * rust-lang/rust#117037 * rust-lang/rust#117034 * rust-lang/rust#116989 * rust-lang/rust#116985 * rust-lang/rust#116950 * rust-lang/rust#116956 * rust-lang/rust#116932 * rust-lang/rust#117031 * rust-lang/rust#117030 * rust-lang/rust#117028 * rust-lang/rust#117026 * rust-lang/rust#116992 * rust-lang/rust#116981 * rust-lang/rust#116955 * rust-lang/rust#116928 * rust-lang/rust#116312 * rust-lang/rust#116368 * rust-lang/rust#116922 * rust-lang/rust#117021 * rust-lang/rust#117020 * rust-lang/rust#117019 * rust-lang/rust#116975 * rust-lang/rust#106601 * rust-lang/rust#116734 * rust-lang/rust#117013 * rust-lang/rust#116995 * rust-lang/rust#116990 * rust-lang/rust#116974 * rust-lang/rust#116964 * rust-lang/rust#116961 * rust-lang/rust#116917 * rust-lang/rust#116911 * rust-lang/rust#114521 * rust-lang/rust#117011 * rust-lang/rust#116958 * rust-lang/rust#116951 * rust-lang/rust#116966 * rust-lang/rust#116965 * rust-lang/rust#116962 * rust-lang/rust#116946 * rust-lang/rust#116899 * rust-lang/rust#116785 * rust-lang/rust#116838 * rust-lang/rust#116875 * rust-lang/rust#116874 * rust-lang/rust#115214 * rust-lang/rust#116810 * rust-lang/rust#116940 * rust-lang/rust#116921 * rust-lang/rust#116906 * rust-lang/rust#116896 * rust-lang/rust#116650 * rust-lang/rust#116132 * rust-lang/rust#116037 * rust-lang/rust#116923 * rust-lang/rust#116912 * rust-lang/rust#116908 * rust-lang/rust#116883 * rust-lang/rust#116829 * rust-lang/rust#116795 * rust-lang/rust#116761 * rust-lang/rust#116663 * rust-lang/rust#114534 * rust-lang/rust#116402 * rust-lang/rust#116493 * rust-lang/rust#116046 * rust-lang/rust#116887 * rust-lang/rust#116885 * rust-lang/rust#116879 * rust-lang/rust#116870 * rust-lang/rust#116865 * rust-lang/rust#116856 * rust-lang/rust#116812 * rust-lang/rust#116815 * rust-lang/rust#116814 * rust-lang/rust#116713 * rust-lang/rust#116830 Co-authored-by: Matthias Krüger <[email protected]> Co-authored-by: antoyo <[email protected]> Co-authored-by: Antoni Boucher <[email protected]> Co-authored-by: bors <[email protected]> Co-authored-by: Esteban Küber <[email protected]> Co-authored-by: Kjetil Kjeka <[email protected]> Co-authored-by: clubby789 <[email protected]> Co-authored-by: okaneco <[email protected]> Co-authored-by: David Tolnay <[email protected]> Co-authored-by: Nadrieril <[email protected]> Co-authored-by: Celina G. Val <[email protected]> Co-authored-by: Ralf Jung <[email protected]> Co-authored-by: Zalathar <[email protected]> Co-authored-by: Havard Eidnes <[email protected]> Co-authored-by: Jacob Pratt <[email protected]> Co-authored-by: Kjetil Kjeka <[email protected]>
74: Automated pull from upstream `master` r=tshepang a=github-actions[bot] This PR pulls the following changes from the upstream repository: * rust-lang/rust#117363 * rust-lang/rust#116405 * rust-lang/rust#117415 * rust-lang/rust#117414 * rust-lang/rust#117411 * rust-lang/rust#117403 * rust-lang/rust#117398 * rust-lang/rust#117396 * rust-lang/rust#117389 * rust-lang/rust#116862 * rust-lang/rust#117405 * rust-lang/rust#117395 * rust-lang/rust#117390 * rust-lang/rust#117383 * rust-lang/rust#117376 * rust-lang/rust#117370 * rust-lang/rust#117357 * rust-lang/rust#117356 * rust-lang/rust#117317 * rust-lang/rust#117132 * rust-lang/rust#117068 * rust-lang/rust#112463 * rust-lang/rust#117267 * rust-lang/rust#116939 * rust-lang/rust#117387 * rust-lang/rust#117385 * rust-lang/rust#117382 * rust-lang/rust#117371 * rust-lang/rust#117365 * rust-lang/rust#117350 * rust-lang/rust#117205 * rust-lang/rust#117177 * rust-lang/rust#117147 * rust-lang/rust#116485 * rust-lang/rust#117328 * rust-lang/rust#117332 * rust-lang/rust#117089 * rust-lang/rust#116733 * rust-lang/rust#116889 * rust-lang/rust#116270 * rust-lang/rust#117354 * rust-lang/rust#117337 * rust-lang/rust#117312 * rust-lang/rust#117082 * rust-lang/rust#117043 * rust-lang/rust#115968 * rust-lang/rust#117336 * rust-lang/rust#117325 * rust-lang/rust#117322 * rust-lang/rust#117259 * rust-lang/rust#117170 * rust-lang/rust#117335 * rust-lang/rust#117319 * rust-lang/rust#117316 * rust-lang/rust#117311 * rust-lang/rust#117162 * rust-lang/rust#115773 * rust-lang/rust#116447 * rust-lang/rust#117149 * rust-lang/rust#116240 * rust-lang/rust#117123 * rust-lang/rust#81746 * rust-lang/rust#117038 * rust-lang/rust#116609 * rust-lang/rust#117309 * rust-lang/rust#117277 * rust-lang/rust#117268 * rust-lang/rust#117256 * rust-lang/rust#117025 * rust-lang/rust#116945 * rust-lang/rust#116816 * rust-lang/rust#116739 * rust-lang/rust#116534 * rust-lang/rust#117253 * rust-lang/rust#117302 * rust-lang/rust#117197 * rust-lang/rust#116471 * rust-lang/rust#117294 * rust-lang/rust#117287 * rust-lang/rust#117281 * rust-lang/rust#117270 * rust-lang/rust#117247 * rust-lang/rust#117246 * rust-lang/rust#117212 * rust-lang/rust#116834 * rust-lang/rust#103208 * rust-lang/rust#117166 * rust-lang/rust#116751 * rust-lang/rust#116858 * rust-lang/rust#117272 * rust-lang/rust#117266 * rust-lang/rust#117262 * rust-lang/rust#117241 * rust-lang/rust#117240 * rust-lang/rust#116868 * rust-lang/rust#114998 * rust-lang/rust#116205 * rust-lang/rust#117260 * rust-lang/rust#116035 * rust-lang/rust#113183 * rust-lang/rust#117249 * rust-lang/rust#117243 * rust-lang/rust#117188 * rust-lang/rust#117114 * rust-lang/rust#117106 * rust-lang/rust#117032 * rust-lang/rust#116968 * rust-lang/rust#116581 * rust-lang/rust#117228 * rust-lang/rust#117221 * rust-lang/rust#117214 * rust-lang/rust#117207 * rust-lang/rust#117202 * rust-lang/rust#117194 * rust-lang/rust#117143 * rust-lang/rust#117095 * rust-lang/rust#116905 * rust-lang/rust#117171 * rust-lang/rust#113262 * rust-lang/rust#112875 * rust-lang/rust#116983 * rust-lang/rust#117148 * rust-lang/rust#117115 * rust-lang/rust#116818 * rust-lang/rust#115872 * rust-lang/rust#117193 * rust-lang/rust#117175 * rust-lang/rust#117009 * rust-lang/rust#117008 * rust-lang/rust#116931 * rust-lang/rust#116553 * rust-lang/rust#116401 * rust-lang/rust#117180 * rust-lang/rust#117173 * rust-lang/rust#117163 * rust-lang/rust#117159 * rust-lang/rust#117154 * rust-lang/rust#117152 * rust-lang/rust#117141 * rust-lang/rust#117111 * rust-lang/rust#117172 * rust-lang/rust#117168 * rust-lang/rust#117160 * rust-lang/rust#117158 * rust-lang/rust#117150 * rust-lang/rust#117136 * rust-lang/rust#117133 * rust-lang/rust#116801 * rust-lang/rust#117165 * rust-lang/rust#117113 * rust-lang/rust#117102 * rust-lang/rust#117076 * rust-lang/rust#116236 * rust-lang/rust#116993 * rust-lang/rust#117139 * rust-lang/rust#116482 * rust-lang/rust#115796 * rust-lang/rust#117135 * rust-lang/rust#117127 * rust-lang/rust#117010 * rust-lang/rust#116943 * rust-lang/rust#116841 * rust-lang/rust#116792 * rust-lang/rust#116714 * rust-lang/rust#116396 * rust-lang/rust#116094 * rust-lang/rust#117126 * rust-lang/rust#117105 * rust-lang/rust#117093 * rust-lang/rust#117092 * rust-lang/rust#117091 * rust-lang/rust#117081 * rust-lang/rust#116773 * rust-lang/rust#117124 * rust-lang/rust#116461 * rust-lang/rust#116435 * rust-lang/rust#116319 * rust-lang/rust#116238 * rust-lang/rust#116998 * rust-lang/rust#116300 * rust-lang/rust#117103 * rust-lang/rust#117086 * rust-lang/rust#117074 * rust-lang/rust#117070 * rust-lang/rust#117046 * rust-lang/rust#116859 * rust-lang/rust#107159 * rust-lang/rust#116033 * rust-lang/rust#107009 * rust-lang/rust#117087 * rust-lang/rust#117073 * rust-lang/rust#117064 * rust-lang/rust#117040 * rust-lang/rust#116978 * rust-lang/rust#116960 * rust-lang/rust#116837 * rust-lang/rust#116835 * rust-lang/rust#116849 * rust-lang/rust#117071 * rust-lang/rust#117069 * rust-lang/rust#117051 * rust-lang/rust#117049 * rust-lang/rust#117044 * rust-lang/rust#117042 * rust-lang/rust#105666 * rust-lang/rust#116606 * rust-lang/rust#117066 * rust-lang/rust#115324 * rust-lang/rust#117062 * rust-lang/rust#117000 * rust-lang/rust#117007 * rust-lang/rust#117018 * rust-lang/rust#116256 * rust-lang/rust#117041 * rust-lang/rust#117037 * rust-lang/rust#117034 * rust-lang/rust#116989 * rust-lang/rust#116985 * rust-lang/rust#116950 * rust-lang/rust#116956 * rust-lang/rust#116932 * rust-lang/rust#117031 * rust-lang/rust#117030 * rust-lang/rust#117028 * rust-lang/rust#117026 * rust-lang/rust#116992 * rust-lang/rust#116981 * rust-lang/rust#116955 * rust-lang/rust#116928 * rust-lang/rust#116312 * rust-lang/rust#116368 * rust-lang/rust#116922 * rust-lang/rust#117021 * rust-lang/rust#117020 * rust-lang/rust#117019 * rust-lang/rust#116975 * rust-lang/rust#106601 * rust-lang/rust#116734 * rust-lang/rust#117013 * rust-lang/rust#116995 * rust-lang/rust#116990 * rust-lang/rust#116974 * rust-lang/rust#116964 * rust-lang/rust#116961 * rust-lang/rust#116917 * rust-lang/rust#116911 * rust-lang/rust#114521 * rust-lang/rust#117011 * rust-lang/rust#116958 * rust-lang/rust#116951 * rust-lang/rust#116966 * rust-lang/rust#116965 * rust-lang/rust#116962 * rust-lang/rust#116946 * rust-lang/rust#116899 * rust-lang/rust#116785 * rust-lang/rust#116838 * rust-lang/rust#116875 * rust-lang/rust#116874 * rust-lang/rust#115214 * rust-lang/rust#116810 * rust-lang/rust#116940 * rust-lang/rust#116921 * rust-lang/rust#116906 * rust-lang/rust#116896 * rust-lang/rust#116650 * rust-lang/rust#116132 * rust-lang/rust#116037 * rust-lang/rust#116923 * rust-lang/rust#116912 * rust-lang/rust#116908 * rust-lang/rust#116883 * rust-lang/rust#116829 * rust-lang/rust#116795 * rust-lang/rust#116761 * rust-lang/rust#116663 * rust-lang/rust#114534 * rust-lang/rust#116402 * rust-lang/rust#116493 * rust-lang/rust#116046 * rust-lang/rust#116887 * rust-lang/rust#116885 * rust-lang/rust#116879 * rust-lang/rust#116870 * rust-lang/rust#116865 * rust-lang/rust#116856 * rust-lang/rust#116812 * rust-lang/rust#116815 * rust-lang/rust#116814 * rust-lang/rust#116713 * rust-lang/rust#116830 Co-authored-by: antoyo <[email protected]> Co-authored-by: Antoni Boucher <[email protected]> Co-authored-by: bors <[email protected]> Co-authored-by: Esteban Küber <[email protected]> Co-authored-by: Kjetil Kjeka <[email protected]> Co-authored-by: clubby789 <[email protected]> Co-authored-by: okaneco <[email protected]> Co-authored-by: David Tolnay <[email protected]> Co-authored-by: Nadrieril <[email protected]> Co-authored-by: Celina G. Val <[email protected]> Co-authored-by: Ralf Jung <[email protected]> Co-authored-by: Zalathar <[email protected]> Co-authored-by: Havard Eidnes <[email protected]> Co-authored-by: Jacob Pratt <[email protected]> Co-authored-by: Kjetil Kjeka <[email protected]> Co-authored-by: Matthias Krüger <[email protected]>
#112353