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use general::{AbstractGroupAbelian, AbstractRingCommutative, Operator, Additive, Multiplicative};


/// A module combines two sets: one with an abelian group structure and another with a
/// commutative ring structure.
///
/// `OpGroup` denotes the abelian group operator (usually the addition). In addition, and external
/// multiplicative law noted `∘` is defined. Let `S` be the ring with multiplicative operator
/// `OpMul` noted `×`, multiplicative identity element noted `1`, and additive operator `OpAdd`.
/// Then:
///
/// ```notrust
/// ∀ a, b ∈ S
/// ∀ x, y ∈ Self
///
/// a ∘ (x + y) = (a ∘ x) + (a ∘ y)
/// (a + b) ∘ x = (a ∘ x) + (b ∘ x)
/// (a × b) ∘ x = a ∘ (b ∘ x)
/// 1 ∘ x       = x
/// ```
pub trait AbstractModule<OpGroup: Operator = Additive,
                         OpAdd:   Operator = Additive,
                         OpMul:   Operator = Multiplicative>
                         : AbstractGroupAbelian<OpGroup> {
    /// The underlying scalar field.
    type AbstractRing: AbstractRingCommutative<OpAdd, OpMul>;

    /// Multiplies an element of the ring with an element of the module.
    fn multiply_by(&self, r: Self::AbstractRing) -> Self;
}