Created
December 12, 2016 18:55
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// https://www.ptt.cc/bbs/Programming/M.1481568735.A.6D7.html | |
// g++ -std=c++0x -ftemplate-depth=1001 a.cpp 2>&1 | grep -oP '(?<=Print<)\d+' | |
template <int i> struct Print { enum : int { | |
v = (void) i // die! | |
};}; | |
template <int i, bool b> struct Test { enum : int { | |
v = 42 | |
};}; | |
template <int i > struct Test<i, false> { enum : int { | |
v = 42 | |
};}; | |
template <int i > struct Test<i, true> { enum : int { | |
v = Print<i>::v | |
};}; | |
template <int i, int d2, int d1, int d0> struct Digits { enum : int { | |
v = Test<i, d2 == 0 ? (d1 == 0 || d1 != d0) | |
: d2 != d1 && d1 != d0 && d0 != d2 | |
>::v | |
};}; | |
template <int i> struct Loop { enum : int { | |
p = Digits<i, i / 100, (i / 10) % 10, i % 10>::v, | |
v = Loop<i + 1>::v | |
};}; | |
template <> struct Loop<1000> { enum : int { | |
v = 42 | |
};}; | |
Loop<1> go; |
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