transform_input.h

// Description: Transform input
// Documentation: input.txt

#ifndef PASTELSYS_TRANSFORM_INPUT_H
#define PASTELSYS_TRANSFORM_INPUT_H

#include "pastel/sys/input/input_concept.h"
#include "pastel/sys/function/function_concept.h"

namespace Pastel
{

    //! Transform input
    template <
        typename Input,
        typename Function>
    class Transform_Input
    {
    public:
        Transform_Input()
            : input_()
            , transform_()
        {
        }

        Transform_Input(
            Input input,
            const Function& transform)
            : input_(input)
            , transform_(transform)
        {
        }

        integer nHint() const
        {
            return input_.nHint();
        }

        bool empty() const
        {
            return input_.empty();
        }

        decltype(auto) get() const
        {
            PENSURE(!empty());
            return transform_(input_.get());
        }

        void pop()
        {
            PENSURE(!empty());
            input_.pop();
        }

    private:
        Input input_;
        Function transform_;
    };

    template <
        typename Input,
        typename Function>
    Transform_Input<Input, Function> transformInput(
        Input input,
        const Function& transform)
    {
        return Transform_Input<Input, Function>(input, transform);
    }

}

#endif