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#[derive(Debug, thiserror::Error)]
pub enum Error {
/// Returned when the lower bound is greater than the upper bound.
#[error("invalid bounds: low ({low}) must be less than or equal to high ({high})")]
InvalidBounds {
/// The lower bound value.
low: f64,
/// The upper bound value.
high: f64,
},
/// Returned when log scale is used with non-positive bounds.
#[error("invalid log bounds: low must be positive for log scale")]
InvalidLogBounds,
/// Returned when step size is not positive.
#[error("invalid step: step must be positive")]
InvalidStep,
/// Returned when categorical choices are empty.
#[error("categorical choices cannot be empty")]
EmptyChoices,
/// Returned when a parameter is suggested with a different configuration.
#[error("parameter conflict for '{name}': {reason}")]
ParameterConflict {
/// The name of the conflicting parameter.
name: String,
/// The reason for the conflict.
reason: String,
},
/// Returned when requesting the best trial but no trials have completed.
#[error("no completed trials available")]
NoCompletedTrials,
/// Returned when gamma is not in the valid range (0.0, 1.0).
#[error("invalid gamma: {0} must be in (0.0, 1.0)")]
InvalidGamma(f64),
/// Returned when bandwidth is not positive.
#[error("invalid bandwidth: {0} must be positive")]
InvalidBandwidth(f64),
/// Returned when KDE is created with empty samples.
#[error("KDE requires at least one sample")]
EmptySamples,
/// Returned when an internal invariant is violated.
#[error("internal error: {0}")]
Internal(&'static str),
/// Returned when an async task fails.
#[cfg(feature = "async")]
#[error("async task error: {0}")]
TaskError(String),
}
pub type Result<T> = core::result::Result<T, Error>;