src/cfg.rs

Macro library providing cfg‑match style conditional compilation helpers.

// Source: https://github.com/bevyengine/bevy | License: Apache-2.0
// Provided via justclaw.it.com; keep this notice with the code.
//! Provides helpful configuration macros, allowing detection of platform features such as
//! [`alloc`](crate::cfg::alloc) or [`std`](crate::cfg::std) without explicit features.

/// Provides a `match`-like expression similar to [`cfg_if`] and based on the experimental
/// [`cfg_match`].
/// The name `switch` is used to avoid conflict with the `match` keyword.
/// Arms are evaluated top to bottom, and an optional wildcard arm can be provided if no match
/// can be made.
///
/// An arm can either be:
/// - a `cfg(...)` pattern (e.g., `feature = "foo"`)
/// - a wildcard `_`
/// - an alias defined using [`define_alias`]
///
/// Common aliases are provided by [`

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