isq.h

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// -*- C++ -*-
#ifndef __cxz_isq_h__
#define __cxz_isq_h__
 
#include <cstdlib>
#include <utility>
#include "types.h"
 
namespace CNORXZ
{
    template <SizeT O, SizeT... Is>
    std::index_sequence<(Is+O)...> mkIsqAdd(std::index_sequence<Is...> is) { return {}; }
 
    template <SizeT B, SizeT E>
    struct MkIsq
    {
    static auto make()
    {
        static_assert(B <= E, "begin of sequence must be smaller than end of sequence");
        return mkIsqAdd<B>( std::make_index_sequence<E-B>{} );
    }
 
    typedef decltype(make()) type;
    };
    template <SizeT B, SizeT E>
    using Isqr = typename MkIsq<B,E>::type;
}
 
#endif