iter.cc.h

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// -*- C++ -*-
#ifndef __cxz_iter_cc_h__
#define __cxz_iter_cc_h__
 
#include "iter.h"
#include "xpr/func.h"
 
namespace CNORXZ
{
    template <class G, class F, SizeT... Is>
    constexpr decltype(auto) iteri(const G& g, const F& f, Isq<Is...> is)
    {
    if constexpr(std::is_same<F,NoF>::value){
        ( g(CSizeT<Is>{}), ... );
    }
    else {
        return f( g(CSizeT<Is>{}) ... );
    }
    }
    template <SizeT B, SizeT E, class G, class F>
    constexpr decltype(auto) iter(const G& g, const F& f)
    {
    return iteri(g, f, Isqr<B,E>{});
    }
 
    template <SizeT E, SizeT I, class G, class F, class C, typename... Args>
    constexpr decltype(auto) iterIfi(const G& g, const F& f, const C& c, const Args&... args)
    {
    if constexpr(I >= E){
        if constexpr(std::is_same<F,NoF>::value){
        return;
        }
        else {
        return f(args...);
        }
    }
    else {
        if constexpr(c(CSizeT<I>{})){
        return iterIfi<E,I+1>(g, f, c, args..., g(CSizeT<I>{}));
        }
        else {
        return iterIfi<E,I+1>(g, f, c, args...);
        }
    }
    }
    template <SizeT B, SizeT E, class G, class F, class C>
    constexpr decltype(auto) iterIf(const G& g, const F& f, const C& c)
    {
    return iterIfi<E,B>(g, f, c);
    }
}
 
#endif