boostorg / boostorg/accumulators

[feature] Exponential Smoothing

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Description

Hi, is there a way to calculate simple exponential smoothing (or [exponential moving average](https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average))? That is,
`s = a * x + (1 - a) * s` for some `0 < a < 1`
If not, would you (or anyone) be interested in PR?

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