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copied!<p>Works with any value you can provide as an unsigned long template argument, in any base:</p> <pre><code>template<unsigned B, unsigned long N> struct base_digits_detail { enum { result = 1 + base_digits_detail<B, N/B>::result }; }; template<unsigned B> struct base_digits_detail<B, 0> { private: enum { result = 0 }; template<unsigned, unsigned long> friend class base_digits_detail; }; template<unsigned B, unsigned long N> struct base_digits { enum { result = base_digits_detail<B, N>::result }; }; template<unsigned B> struct base_digits<B, 0> { enum { result = 1 }; }; </code></pre> <h3>Test</h3> <pre><code>#include <climits> #include <iostream> int main() { std::cout << base_digits<10, 0>::result << '\n'; std::cout << base_digits<10, 1>::result << '\n'; std::cout << base_digits<10, 10>::result << '\n'; std::cout << base_digits<10, 100>::result << '\n'; std::cout << base_digits<10, 1000>::result << '\n'; std::cout << base_digits<10, UINT_MAX>::result << '\n'; std::cout << '\n'; std::cout << base_digits<8, 0>::result << '\n'; std::cout << base_digits<8, 01>::result << '\n'; std::cout << base_digits<8, 010>::result << '\n'; std::cout << base_digits<8, 0100>::result << '\n'; std::cout << base_digits<8, 01000>::result << '\n'; std::cout << base_digits<8, UINT_MAX>::result << '\n'; return 0; } </code></pre> <h3><a href="http://codepad.org/1avlPttJ" rel="nofollow noreferrer">Output</a></h3> <pre><code>1 1 2 3 4 10 1 1 2 3 4 11 </code></pre>

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