generate_unshifted_mask_t.hpp

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#pragma once

template <unsigned width>
struct generate_unshifted_mask_t
{
   enum { value = (generate_unshifted_mask_t<width - 1>::value << 1) | 1 };
};

template <>
struct generate_unshifted_mask_t<0>
{
   enum { value = 0 };
};