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qubit_argument/argument/constraint/
length_constraint.rs

1// =============================================================================
2//    Copyright (c) 2025 - 2026 Haixing Hu.
3//
4//    SPDX-License-Identifier: Apache-2.0
5//
6//    Licensed under the Apache License, Version 2.0.
7// =============================================================================
8//! Relationships used by string and collection length constraints.
9
10/// A numeric relationship required of a measured string or collection length.
11///
12/// [`LengthMetric`](super::LengthMetric) identifies the measurement unit in a
13/// structured validation error.
14#[derive(Debug, Clone, PartialEq, Eq)]
15pub enum LengthConstraint {
16    /// Requires exactly the specified length.
17    Exact(usize),
18    /// Requires at least the specified length.
19    AtLeast(usize),
20    /// Requires at most the specified length.
21    AtMost(usize),
22    /// Requires a length between `min` and `max`, inclusive.
23    InRange {
24        /// The inclusive minimum length.
25        min: usize,
26        /// The inclusive maximum length.
27        max: usize,
28    },
29}