Created
December 11, 2015 22:51
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A generic averaging function using TMP.
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| template<typename Accumulator, typename Divisor, std::size_t N> | |
| class Average | |
| { | |
| public: | |
| template<typename... Args> | |
| constexpr auto operator()(Args&&... args) | |
| { | |
| return _average(Accumulator(), std::forward<Args>(args)...); | |
| } | |
| private: | |
| constexpr auto _average(Accumulator sum) | |
| { | |
| return sum / static_cast<Divisor>(N); | |
| } | |
| template<typename Head, typename... Tail> | |
| constexpr auto _average(Accumulator sum, Head&& head, Tail&&... tail) | |
| { | |
| sum = sum + std::forward<Head>(head); | |
| return _average(sum, std::forward<Tail>(tail)...); | |
| } | |
| }; | |
| template<typename Accumulator = double, typename Divisor = double, typename... Args> | |
| constexpr auto average(Args&&... args) | |
| { | |
| return Average<Accumulator, Divisor, sizeof...(args)>()( | |
| std::forward<Args>(args)... | |
| ); | |
| } |
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