#ifndef OPERATORS_HPP_
#define OPERATORS_HPP_

#include "number.hpp"
#include "white.hpp"

struct multiplication;

typedef concat
<
    white ,
    number ,
    opt
    <
        concat
        <
            white ,
            terminal< '*' > ,
            white ,
            multiplication
        >
    > ,
    white
> mult_impl;

struct multiplication
    : mult_impl
{
    template< class ...ArgTypes >
    constexpr multiplication( ArgTypes ...args )
        : mult_impl( args... )
    {
    }
    constexpr unsigned int eval()
    {
        return get< 1 >().eval() *
            (
                get< 2 >() ?
                get< 2 >().get().get< 3 >().eval() :
                1
            );
    }
};

struct addition;
typedef concat
<
    white ,
    multiplication ,
    opt
    <
        concat
        <
            white ,
            terminal< '+' > ,
            white ,
            addition
        >
    > ,
    white
> addit_impl;

struct addition
    : addit_impl
{
    template< class ...ArgTypes >
    constexpr addition( ArgTypes ...args )
        : addit_impl( args... )
    {
    }
    constexpr unsigned int eval()
    {
        return get< 1 >().eval() +
            (
                get< 2 >() ?
                get< 2 >().get().get< 3 >().eval() :
                0
            );
    }
};

#endif