qubit-budget 0.4.0

Dependency-light resource limit and budget accounting primitives for Qubit Rust crates
Documentation 
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// =============================================================================
//    Copyright (c) 2025 - 2026 Haixing Hu.
//
//    SPDX-License-Identifier: Apache-2.0
//
//    Licensed under the Apache License, Version 2.0.
// =============================================================================
//! Defines resource identities for structural input limits.

/// A structural quantity constrained while processing nested data.
///
/// # Examples
///
/// ```
/// use qubit_budget::ResourceLimit;
/// use qubit_budget::StructureResource;
///
/// let limit = ResourceLimit::new(StructureResource::Depth, 4_usize);
/// assert_eq!(limit.maximum(), 4);
/// ```
#[non_exhaustive]
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum StructureResource {
    /// The nesting depth of the current value.
    Depth,

    /// The cumulative number of nodes processed in one session.
    Nodes,

    /// The number of items in one sequence value.
    SequenceItems,

    /// The number of entries in one map value.
    MapEntries,

    /// The byte length of one structural key.
    KeyBytes,
}