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| author | bors <bors@rust-lang.org> | 2017-09-16 17:02:17 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2017-09-16 17:02:17 +0000 |
| commit | ae8efdc87d5f4e22e05e1b60a72272cee87fa74c (patch) | |
| tree | fc7932f915f347bd68db4143b2e097e620faa538 /src/libstd/lib.rs | |
| parent | b965d55a3214b78ec9ffdd3017cb6aaa62c28059 (diff) | |
| parent | 332c38cd70e372f56356e02b18b88919fcb58a66 (diff) | |
| download | rust-ae8efdc87d5f4e22e05e1b60a72272cee87fa74c.tar.gz rust-ae8efdc87d5f4e22e05e1b60a72272cee87fa74c.zip | |
Auto merge of #43017 - durka:stabilize-const-invocation, r=eddyb
Individualize feature gates for const fn invocation
This PR changes the meaning of `#![feature(const_fn)]` so it is only required to declare a const fn but not to call one. Based on discussion at #24111. I was hoping we could have an FCP here in order to move that conversation forward.
This sets the stage for future stabilization of the constness of several functions in the standard library (listed below), so could someone please tag the lang team for review.
- `std::cell`
- `Cell::new`
- `RefCell::new`
- `UnsafeCell::new`
- `std::mem`
- `size_of`
- `align_of`
- `std::ptr`
- `null`
- `null_mut`
- `std::sync`
- `atomic`
- `Atomic{Bool,Ptr,Isize,Usize}::new`
- `once`
- `Once::new`
- primitives
- `{integer}::min_value`
- `{integer}::max_value`
Some other functions are const but they are also unstable or hidden, e.g. `Unique::new` so they don't have to be considered at this time.
After this stabilization, the following `*_INIT` constants in the standard library can be deprecated. I wasn't sure whether to include those deprecations in the current PR.
- `std::sync`
- `atomic`
- `ATOMIC_{BOOL,ISIZE,USIZE}_INIT`
- `once`
- `ONCE_INIT`
Diffstat (limited to 'src/libstd/lib.rs')
| -rw-r--r-- | src/libstd/lib.rs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs index 33bf0d68126..aa1337a9da0 100644 --- a/src/libstd/lib.rs +++ b/src/libstd/lib.rs @@ -292,6 +292,7 @@ #![feature(raw)] #![feature(repr_simd)] #![feature(rustc_attrs)] +#![cfg_attr(not(stage0), feature(rustc_const_unstable))] #![feature(shared)] #![feature(sip_hash_13)] #![feature(slice_bytes)] @@ -315,6 +316,17 @@ #![feature(doc_cfg)] #![cfg_attr(test, feature(update_panic_count))] +#![cfg_attr(not(stage0), feature(const_max_value))] +#![cfg_attr(not(stage0), feature(const_atomic_bool_new))] +#![cfg_attr(not(stage0), feature(const_atomic_isize_new))] +#![cfg_attr(not(stage0), feature(const_atomic_usize_new))] +#![cfg_attr(all(not(stage0), windows), feature(const_atomic_ptr_new))] +#![cfg_attr(not(stage0), feature(const_unsafe_cell_new))] +#![cfg_attr(not(stage0), feature(const_cell_new))] +#![cfg_attr(not(stage0), feature(const_once_new))] +#![cfg_attr(not(stage0), feature(const_ptr_null))] +#![cfg_attr(not(stage0), feature(const_ptr_null_mut))] + #![default_lib_allocator] // Always use alloc_system during stage0 since we don't know if the alloc_* |