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use crate::Number;
use super::Term;

/// A Term that returns a constant value no matter what value is passed in
pub struct ConstantTerm<T: Number>
{

    c: T

}

impl<T:Number> ConstantTerm<T>
{

    ///Creates a ConstantTerm obtained by parsing a string slice
    ///
    /// # Examples
    ///
    /// ```
    /// use crate::parametrizer::term::constantterm::ConstantTerm;
    /// use crate::parametrizer::term::Term;
    ///
    /// let int_constant = ConstantTerm::new(17);
    /// let float_constant = ConstantTerm::new(5.2);
    ///
    /// assert_eq!(17, int_constant.evaluate(9));
    /// assert_eq!(17, int_constant.evaluate(-1));
    /// assert_eq!(5.2, float_constant.evaluate(3.4));
    /// assert_eq!(5.2, float_constant.evaluate(5.0));
    /// ```
    pub fn new(param: T) -> ConstantTerm<T>
    {

        return ConstantTerm::<T> { c: param };

    }

}

impl<T: Number> Term<T> for ConstantTerm<T>
{

    ///Returns the associated constant number no matter what value of t is passed in
    fn evaluate(&self, _t: T) -> T
    {

        return self.c;

    }

}