exercise-3-0.hpp

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// ===-- chapter-3/exercise-3-0.hpp ----------------------- -*- C++ -*- --=== //
#ifndef EXERCISE_3_0
#define EXERCISE_3_0
 
#include <boost/static_assert.hpp>
 
 
namespace exercise_3_0 {
 
template <unsigned long N>
struct checked_binary
{
    BOOST_STATIC_ASSERT(((N % 10) < 2));
 
    static unsigned const value =
        (checked_binary<N/10>::value * 2) + (N % 10);
};
 
template<>
struct checked_binary<0>
{
    static unsigned const value = 0;
};
 
} // namespace exercise_3_0
 
#endif // EXERCISE_3_0