0.3.8

Added

• Support for targets with limited or no atomics support (e.g., riscv32i-*, thumbv6m-*). Requires cfg(target_has_atomic = ...), which was stabilized in Rust 1.60.0.

Fixed

• impl_singleton_token_factory! is now more resistant to exotic environments (e.g., type bool = u32 in an outer scope).

0.3.7

Added

• SingletonTokenId: ConstDefault if the const-default_1 Cargo feature is enabled

0.3.6

Added

• const-default_1 Cargo feature, which enables the implementation of ConstDefault from const-default ^1.

0.3.5

Added

• New token types
  • IcToken (counter-based tokens)
  • BrandedToken and with_branded_token (a GhostCell implementation)
    • (Unstable) with_branded_token_async
• Trait implementations
  • impl Display for {BadTokenError, SingletonTokenExhaustedError} when cfg(not(feature = "std"))
• TokenLock operations
  • TokenLock::wrap, a constructor that default-initializes Keyhole: TokenId, provided for convenience
  • *TokenLock::{set, try_set}, which assign a new value and discard the old one
• TokenLock variants
  • [Unsync]PinTokenLock
• Miscellaneous
  • SingletonTokenLock<T, Tag> (an alias of TokenLock<T, SingletonTokenId<Tag>>) and its variants

Changed

• Raise the minimum supported Rust version to 1.54.0 (MSRV changes are not considered semver-breaking anymore.)
• RcToken and ArcToken now only require cfg(feature = "alloc")
• impl_singleton_token_factory! can now be applied to multiple types in a single macro call

0.3.4

Fixed

• Preserve the Sync-ness variant when Deref-ing a SingletonTokenRefMut

0.3.3

Fixed

• Fixed the crate failing to compile when building without std feature

0.3.2

Added

• SingletonToken, a zero-sized token type
• UnsyncTokenLock, which has more lenient requirements for Sync-ness provided that the token type is !Sync. You can store a Cell in UnsyncTokenLock, which will still be Sync.

Changed

• Relaxed the requirements for TokenLock: Send, Sync.

0.3.1

• Update README.md

0.3.0

• Breaking: Raise the minimum supported Rust version to 1.34.2
• Breaking: Rename TokenLock::{read → try_read, write → try_write}, introducing a panicking variation TokenLock::{read, write} of these methods
• Add TokenLock::{get, try_get, replace, replace_with, try_replace_with, clone, try_clone, swap, try_swap, take, try_take}
• Implement Default

0.2.3

• Add TokenLock::{as_ptr, into_inner}
• Support no_std