Editing CPPTM Answers - Exercise 3-0

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// (by Ariel Badichi)
 #include <iostream>
 
 #include <boost/static_assert.hpp>
 
 template<unsigned int N>
 struct binary
 {
     static const unsigned int digit = N % 10;
     BOOST_STATIC_ASSERT(digit == 0 || digit == 1);
     static const unsigned int value = digit + (binary<N / 10>::value * 2);
 };
 
 template<>
 struct binary<0>
 {
     static const unsigned int value = 0;
 };
 
 int main()
 {
     // add a 2 and see what happens ;)
     std::cout << binary<101010>::value << "\n";
     return 0;
 }

--------------------
my answer, similar but different (note: this editor is messing with my text so look at this in the editor as it does not appear that way on the site)...

#include <boost/static_assert.hpp>
#include <boost/mpl/int.hpp>

#ifdef NDEBUG
#	define CTASSERT(x) 
#else
#	define CTASSERT(x) BOOST_STATIC_ASSERT(x)
#endif

template<unsigned long N>
class binary: public boost::mpl::int_<boost::mpl::int_<binary<N/10>::value>::value<<1 | N%10>
{
	CTASSERT((N%10 & ~1) == 0);
};

template<>
class binary<0>: public boost::mpl::int_<0>
{
};

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