buf_xpr.h

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// -*- C++ -*-
#include "xpr_base.h"
 
namespace CNORXZ
{
    template <typename T, class IXprF>
    class BufXpr : public XprInterface<BufXpr>
    {
    public:
    BufXpr() = default;
    BufXpr(const BufXpr& in);
    BufXpr(BufXpr&& in);
    BufXpr& operator=(const BufXpr& in);
    BufXpr& operator=(BufXpr&& in);
 
    constexpr BufXpr(IXprF&& ixprf);
 
    template <class PosT>
    inline decltype(auto) operator()(const PosT& last) const;
 
    inline decltype(auto) operator()() const;
 
    template <SizeT I>
    inline decltype(auto) rootSteps(const IndexId<I>& id) const;
 
    private:
    T mBuf;
    IXprF mIXprF; // function to create set-buffer-xpr (reference to mBuf as arg)
    typedef decltype(mIXprF(mBuf)) IXpr;
    IXpr mIXpr;
    };
 
    template <typename T, class IXprF>
    constexpr decltype(auto) bufxpr(IXprF&& ixprf);
}