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#include <cassert>
#define INSIDE
class sc_uint_subref;
class sc_uint_base
{
friend class sc_uint_subref;
public:
sc_uint_base(unsigned long v)
: val(v)
{
}
sc_uint_subref range(int left, int right)
#ifndef INSIDE
;
#else
{
return sc_uint_subref(this, left, right);
}
#endif
protected:
unsigned long val;
};
class sc_uint_subref
{
friend class sc_uint_base;
public:
sc_uint_subref() {}
sc_uint_subref(sc_uint_base *_ptr, int _left, int _right)
: left(_left), right(_right), ptr(_ptr)
{}
bool operator==(const sc_uint_base &other)
{
return ptr->val == other.val;
}
sc_uint_subref &operator=(const sc_uint_subref &other)
{
ptr = other.ptr;
left = other.left;
right = other.right;
return *this;
}
protected:
int left, right;
sc_uint_base *ptr;
};
#ifndef INSIDE
sc_uint_subref sc_uint_base::range(int left, int right)
{
return sc_uint_subref(this, left, right);
}
#endif
int main(int argc, char** argv)
{
sc_uint_base x(42);
sc_uint_subref y = x.range(0,5);
assert(y == x);
return 0;
}
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