23 lines
584 B
D
23 lines
584 B
D
import std.stdio, std.traits, std.algorithm;
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struct SMA(T, int period) {
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T[period] data = 0;
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T sum = 0;
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int index, nFilled;
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auto opCall(in T v) pure nothrow @safe @nogc {
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sum += -data[index] + v;
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data[index] = v;
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index = (index + 1) % period;
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nFilled = min(period, nFilled + 1);
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return CommonType!(T, float)(sum) / nFilled;
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}
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}
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void main() {
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SMA!(int, 3) s3;
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SMA!(double, 5) s5;
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foreach (immutable e; [1, 2, 3, 4, 5, 5, 4, 3, 2, 1])
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writefln("Added %d, sma(3) = %f, sma(5) = %f", e, s3(e), s5(e));
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}
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