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doc: Context

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(cherry picked from commit 976ecda38530d57b872c20eaeab5d3631076140b)
This commit is contained in:
Robert Hensing 2024-06-27 18:26:05 +02:00
parent 01c9d0b2d3
commit eb0595226d
1 changed files with 3 additions and 0 deletions
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rust/nix-util/src/context.rs
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@ -3,6 +3,9 @@ use nix_c_raw as raw;
use std::ptr::null_mut;
use std::ptr::NonNull;
/// A context for error handling, when interacting directly with the generated bindings for the C API in [nix_c_raw].
///
/// The `nix-store` and `nix-expr` libraries that consume this type internally store a private context in their `EvalState` and `Store` structs to avoid allocating a new context for each operation. The state of a context is irrelevant when used correctly (e.g. with [check_call!]), so it's safe to reuse, and safe to allocate more contexts in methods such as [Clone::clone].
pub struct Context {
inner: NonNull<raw::c_context>,
}