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e3c0158788
Vec::try_with_capacity Related to #91913 Implements try_with_capacity for `Vec`, `VecDeque`, and `String`. I can follow it up with more collections if desired. `Vec::try_with_capacity()` is functionally equivalent to the current stable: ```rust let mut v = Vec::new(); v.try_reserve_exact(n)? ``` However, `try_reserve` calls non-inlined `finish_grow`, which requires old and new `Layout`, and is designed to reallocate memory. There is benefit to using `try_with_capacity`, besides syntax convenience, because it generates much smaller code at the call site with a direct call to the allocator. There's codegen test included. It's also a very desirable functionality for users of `no_global_oom_handling` (Rust-for-Linux), since it makes a very commonly used function available in that environment (`with_capacity` is used much more frequently than all `(try_)reserve(_exact)`). |
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| .. | ||
| arc.rs | ||
| autotraits.rs | ||
| borrow.rs | ||
| boxed.rs | ||
| btree_set_hash.rs | ||
| c_str.rs | ||
| const_fns.rs | ||
| cow_str.rs | ||
| fmt.rs | ||
| heap.rs | ||
| lib.rs | ||
| linked_list.rs | ||
| rc.rs | ||
| slice.rs | ||
| str.rs | ||
| string.rs | ||
| task.rs | ||
| thin_box.rs | ||
| vec_deque.rs | ||
| vec.rs | ||