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    #include<iostream>
    #include <boost/static_assert.hpp>
 
    template<int N>
    struct is_power_of_two 
    {
        enum { val = (N > 1) & !(N & (N - 1)) };
        //static_assert(val, "should use a power of 2 as template parameter");
        BOOST_STATIC_ASSERT(val);
    };
 
    int main()
    {
            std::cout << is_power_of_two<2>::val << "\n";
            std::cout << is_power_of_two<3>::val << "\n";
    }

prog.cpp: In instantiation of ‘is_power_of_two<3>’:
prog.cpp:15:   instantiated from here
prog.cpp:9: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ 

Standard output is empty