qubit-argument 0.4.3

Structured, ownership-preserving argument validation for Rust applications
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.
// =============================================================================
//! Relationships used by string and collection length constraints.

/// A numeric relationship required of a measured string or collection length.
///
/// [`LengthMetric`](super::LengthMetric) identifies the measurement unit in a
/// structured validation error.
///
/// ```compile_fail
/// #![deny(unused_must_use)]
/// use qubit_argument::LengthConstraint;
///
/// LengthConstraint::Exact(1);
/// ```
#[must_use]
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum LengthConstraint {
    /// Requires exactly the specified length.
    Exact(usize),
    /// Requires at least the specified length.
    AtLeast(usize),
    /// Requires at most the specified length.
    AtMost(usize),
    /// Requires a length between `min` and `max`, inclusive.
    InRange {
        /// The inclusive minimum length.
        min: usize,
        /// The inclusive maximum length.
        max: usize,
    },
}