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#include <cstdio> | |
template <char... C> | |
struct S { | |
static const char* value() { | |
static constexpr char s[] = { C..., '\0' }; | |
return s; | |
} | |
}; | |
template <typename T, typename U> | |
struct Plus; | |
template <char... C, char... D> | |
struct Plus<S<C...>, S<D...>> { | |
using Type = S<C..., D...>; | |
}; | |
template <int N, char... C> | |
struct ToStr { | |
using Type = typename ToStr<N/10, N%10+'0', C...>::Type; | |
}; | |
template <char... C> | |
struct ToStr<0, C...> { | |
using Type = S<C...>; | |
}; | |
template <int I, int M = I%3, int N = I%5> | |
struct Value { | |
using Type = typename ToStr<I>::Type; | |
}; | |
template <int I, int N> | |
struct Value<I, 0, N> { | |
using Type = S<'F','i','z','z'>; | |
}; | |
template <int I, int M> | |
struct Value<I, M, 0> { | |
using Type = S<'B','u','z','z'>; | |
}; | |
template <int I> | |
struct Value<I, 0, 0> { | |
using Type = S<'F','i','z','z','B','u','z','z'>; | |
}; | |
template <int N> | |
struct FizzBuzz { | |
using Type = typename Plus< | |
typename FizzBuzz<N-1>::Type, | |
typename Plus< | |
typename Value<N>::Type, | |
S<'\n'> | |
>::Type | |
>::Type; | |
}; | |
template <> | |
struct FizzBuzz<0> { | |
using Type = S<>; | |
}; | |
int main() { | |
puts(FizzBuzz<50>::Type::value()); | |
} |
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