Cargo Features

[dependencies]
circularbuf = { version = "0.1.0", default-features = false, features = ["std", "alloc", "future", "tokio"] }
default = std

The std feature is set by default whenever circularbuf is added without default-features = false somewhere in the dependency tree.

std default future? tokio?
alloc
future = std

Enables std of futures-io

tokio = std

Enables tokio

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

futures-io future?