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#[cfg(feature = "single_float")]
mod float_def {
    pub use f32 as float;
    pub use std::f32::consts::PI;
}
#[cfg(not(feature = "single_float"))]
mod float_def {
    pub use f64 as float;
    pub use std::f64::consts::PI;
}

pub use float_def::*;

#[cfg(feature = "use_meter")]
mod unit {
    pub const METER: super::float = 1.0;
}
#[cfg(not(feature = "use_meter"))]
mod unit {
    pub const METER: super::float = 1000.0;
}
pub use unit::*;

pub const MILLIMETER: float = METER / 1000.0;

pub const ULTRASOUND_FREQUENCY: float = 40e3;

pub type Complex = nalgebra::Complex<float>;

pub const ABSOLUTE_THRESHOLD_OF_HEARING: float = 20e-6;

pub const T4010A1_AMPLITUDE: float = 275.574246625 * 200.0 * MILLIMETER; // [Pa*mm]