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airglow923/constexpr-pow.cpp

Created December 18, 2020 15:07
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Exponents at compile time
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constexpr-pow.cpp
namespace {
using LL = signed long long int;
template <LL N, LL X>
struct PowerOf {
static constexpr LL value_ = N * PowerOf<N, X - 1>::value_;
};
template <LL N>
struct PowerOf<N, 0> {
static constexpr LL value_ = 1;
};
} // namespace
template <LL N, LL X>
inline constexpr LL PowerOfV = PowerOf<N, X>::value_;
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