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// -*-C++-*-
#ifndef VEC_MASK_H
#define VEC_MASK_H
#include <cstdlib>
namespace vecmathlib {
using namespace std;
template<typename realvec_t>
class mask_t {
friend realvec_t;
typedef typename realvec_t::boolvec_t boolvec_t;
typedef typename realvec_t::intvec_t intvec_t;
static int const size = realvec_t::size;
ptrdiff_t imin, imax;
ptrdiff_t i;
boolvec_t m;
bool all_m;
public:
mask_t(boolvec_t m_): m(m_), all_m(all(m)) {}
mask_t(ptrdiff_t imin_, ptrdiff_t imax_, ptrdiff_t ioff):
imin(imin_), imax(imax_),
i(imin - (ioff + imin) % size)
{
all_m = i>=imin && i<=imax-size;
if (__builtin_expect(all_m, true)) {
m = true;
} else {
m = (intvec_t(i) >= intvec_t(imin ) - intvec_t::iota() &&
intvec_t(i) <= intvec_t(imax-size) - intvec_t::iota());
}
}
ptrdiff_t index() const { return i; }
operator bool() const { return i<imax; }
void operator++()
{
i += size;
all_m = i<=imax-size;
if (__builtin_expect(all_m, true)) {
m = true;
} else {
m = intvec_t(i) <= intvec_t(imax-size) - intvec_t::iota();
}
}
};
} // namespace vecmathlib
#endif // #ifndef VEC_MASK_H
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