Feature flags of ZeroGc crate // Lib.rs

Cargo Features

[dependencies]
zerogc = { version = "0.2.0-alpha.7", default-features = false, features = ["std", "alloc", "allocator-api", "hashmap-impl", "errors", "serde1", "epsilon", "epsilon-arena-alloc", "parking_lot", "anyhow"] }

default = epsilon, epsilon-arena-alloc, std

These default features are set whenever zerogc is added without default-features = false somewhere in the dependency tree.

std default = alloc

Depend on the standard library (optional)

This implements tracing for most standard library types.

alloc std

Depend on extern crate alloc in addition to the Rust core This is implied by using the standard library (feature="std")

This implements Trace for Box and collections like Vec

Affects zerogc::GcSimpleAlloc.alloc_array_from_vec…

allocator-api hashmap-impl?

Emulate the core::alloc::Allocator api

NOTE: This doesn't necessarily require the 'alloc' feature (because the API itself is in 'core')

Affects zerogc::allocator…

hashmap-impl = ahash, allocator-api, hashbrown

Our custom hashmap implementation

Affects zerogc::hash_map…

errors

Support a 'GcError' type that implements 'std::error::Error'
by wrapping a 'GcHandle'

Affects zerogc::errors, zerogc::GcSimpleAlloc.alloc_error…

serde1 = serde

Serde support

Enables serde of arrayvec and hashbrown ^0.11 and zerogc-derive

Used for macros

and serde-1 of indexmap ^1.6

Manually included tracing support for third party libraries Providing support for these important libraries,
gives zerogc batteries included support.

Affects zerogc::serde…

epsilon default epsilon-arena-alloc

Support the "epsilon" no-op collector

epsilon-arena-alloc default = bumpalo, epsilon

Configure the "epsilon" collector use arena allocation (on by default)

Affects alloc::Default…

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.

indexmap serde1?

Enables indexmap ^1.6

parking_lot implicit feature