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    //! Provides traits for numbers.
    //!
    //! Focuses on floating point numbers so far.

    /// Represents a number that has zero.
    pub trait Zero {
        /// Returns zero.
        fn zero() -> Self;
    }

    impl Zero for f32 {
        fn zero() -> f32 {
            0.0f32
        }
    }

    impl Zero for f64 {
        fn zero() -> f64 {
            0.0f64
        }
    }

    /// Represents a number that has one.
    pub trait One {
        /// Returns one.
        fn one() -> Self;
    }

    impl One for f32 {
        fn one() -> f32 {
            1.0f32
        }
    }

    impl One for f64 {
        fn one() -> f64 {
            1.0f64
        }
    }

    /// Represents a number that has positive infinity.
    pub trait Infinity {
        /// Returns positive infinity.
        fn infinity() -> Self;
    }

    impl Infinity for f32 {
        fn infinity() -> f32 {
            f32::INFINITY
        }
    }

    impl Infinity for f64 {
        fn infinity() -> f64 {
            f64::INFINITY
        }
    }

    /// Represents a number converted from another primitive type.
    pub trait FromAs<T> {
        /// Returns the converted number.
        fn from_as(t: T) -> Self;
    }

    impl FromAs<usize> for f32 {
        fn from_as(t: usize) -> f32 {
            t as f32
        }
    }

    impl FromAs<usize> for f64 {
        fn from_as(t: usize) -> f64 {
            t as f64
        }
    }

    /// Represents a number that can return an absolute value.
    pub trait Abs {
        /// Returns the absolute value.
        fn abs(self) -> Self;
    }

    impl Abs for f32 {
        fn abs(self) -> f32 {
            self.abs()
        }
    }

    impl Abs for f64 {
        fn abs(self) -> f64 {
            self.abs()
        }
    }

    /// Represents a number that can calculate a square root.
    pub trait Sqrt {
        /// Returns the square root.
        fn sqrt(self) -> Self;
    }

    impl Sqrt for f32 {
        fn sqrt(self) -> f32 {
            self.sqrt()
        }
    }

    impl Sqrt for f64 {
        fn sqrt(self) -> f64 {
            self.sqrt()
        }
    }