lambda_vectorexpression.h

// Description: Lambda-function vector-expression
// Documentation: vectorexpression.txt

#ifndef PASTELSYS_LAMBDA_VECTOREXPRESSION_H
#define PASTELSYS_LAMBDA_VECTOREXPRESSION_H

#include "pastel/sys/vector/vectorexpression.h"

namespace Pastel
{

    template <
        typename Real,
        integer N,
        typename Function>
    class VectorLambda
        : public VectorExpression<Real, N, VectorLambda<Real, N, Function>>
    {
    public:
        using StorageType = const VectorLambda;

        VectorLambda(
            const Function& function,
            integer size)
            : function_(function)
            , size_(size)
        {
        }

        Real operator[](integer index) const
        {
            unused(index);
            return function_(index);
        }

        integer size() const
        {
            return size_;
        }

        bool involves(
            const void* memoryBegin, const void* memoryEnd) const
        {
            return false;
        }

        bool evaluateBeforeAssignment(
            const void* memoryBegin, const void* memoryEnd) const
        {
            return false;
        }

    private:
        Function function_;
        integer size_;
    };

    template <
        typename Real,
        integer N = Dynamic,
        typename Function>
    decltype(auto) lambdaVector(
        const Function& function,
        integer size)
    {
        return VectorLambda<Real, N, Function>(function, size);
    }

}

#endif