Crate featureflag

Feature flagging facade for Rust.

This library provides a flexible and extensible way to control feature flags in Rust applications.

The core trait of this library is the Evaluator, which is used to evaluate feature flags at runtime.

The context! macro and Context type can be in evaluators to provide contextual information for feature flag evaluation, such as user ID and session ID.

The is_enabled! macro is the primary way to check if a feature is enabled. This macro takes a feature name and a default value, and returns a boolean indicating whether the feature is enabled or not. Alternatively, the feature! macro can be used to store a Feature is a variable or constant, or the Feature::new or Feature::new_with_default_fn methods can be used directly to create new feature flags at runtime.

Re-exports

pub use crate::context::Context;

pub use crate::evaluator::Evaluator;

pub use crate::evaluator::set_global_default;

pub use crate::evaluator::try_set_global_default;

pub use crate::feature::Feature;

Modules

context

Context values for context-aware features.

evaluator

Evaluators of feature flags.

extensions

Extensions for storing custom data in Contexts.

feature

Feature flags.

fields

Fields struct and macro for creating a collection of fields for use in context!.

utils

This module provides utilities for wrapping types with a Context or Evaluator.

value

Value types for the context! macro.

Macros

context

Create a new context with the given fields.

feature

Define a feature flag at compile-time.

fields

Creates a new Fields instance with the given fields.

is_enabled

Check if a feature is enabled.