Enum ErrorsPositiveRealScalar 

pub enum ErrorsPositiveRealScalar<RealType: RealScalar> {
    NegativeValue {
        value: RealType,
        backtrace: Backtrace,
    },
    ZeroValue {
        backtrace: Backtrace,
    },
}

Error type for PositiveRealScalar<T> validation failures.

This enum provides detailed error information when attempting to construct a PositiveRealScalar<T> with invalid input values.

Error Variants

• ErrorsPositiveRealScalar::NegativeValue: The input was negative (< 0).
• ErrorsPositiveRealScalar::ZeroValue: The input was zero (not strictly positive).

Mathematical Distinction

Positive real numbers are defined as ℝ⁺ = {x ∈ ℝ : x > 0}, which excludes zero. This is distinct from non-negative reals ℝ₀⁺ = {x ∈ ℝ : x ≥ 0}.

Examples

use num_valid::scalars::{PositiveRealScalar, ErrorsPositiveRealScalar};
use try_create::TryNew;

// Zero is NOT positive
match PositiveRealScalar::try_new(0.0_f64) {
    Err(ErrorsPositiveRealScalar::ZeroValue { .. }) => {
        println!("Zero is not strictly positive (x > 0 required)");
    }
    _ => unreachable!(),
}

// Negative values rejected with the value included in the error
match PositiveRealScalar::try_new(-2.5_f64) {
    Err(ErrorsPositiveRealScalar::NegativeValue { value, .. }) => {
        assert_eq!(value, -2.5);
    }
    _ => unreachable!(),
}

Variants

NegativeValue

The input value was negative (< 0).

Fields

value: RealType

The specific negative value that was rejected.

backtrace: Backtrace

Stack trace for debugging.

ZeroValue

The input value was exactly zero (not strictly positive).

Zero is NOT positive in mathematical terms. The positive real numbers are defined as ℝ⁺ = {x ∈ ℝ : x > 0}, which excludes zero.

Fields

backtrace: Backtrace

Stack trace for debugging.

Trait Implementations

impl<RealType: Debug + RealScalar> Debug for ErrorsPositiveRealScalar<RealType>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<RealType> Display for ErrorsPositiveRealScalar<RealType>

where RealType: Display + RealScalar,

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<RealType: RealScalar> Error for ErrorsPositiveRealScalar<RealType>

where Self: Debug + Display,

fn provide<'_request>(&'_request self, request: &mut Request<'_request>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting