Holp decimal format calculating expression

[TuringZhu]

I hope decimal.Decimal can have a method that show calculating expression, example:num1.Div(num2).Add(num3).Round(4). if num1=1.23, num2=2.34, num3=3.45, then it can format like as follow:

round(1.23 / 2.34 + 3.45, 4)

the real scene comes from the following code:

// ask * askSize/(askSize + bidSize) + bid * bidSize/(bidSize + askSize)   // round(precision)
last := vv.Ask.Mul(vv.AskSize.Div(vv.AskSize.Add(vv.BidSize))).Add(vv.Bid.Mul(vv.BidSize.Div(vv.AskSize.Add(vv.BidSize)))).Round(precision)

now I have to comment it above.

[mwoss]

Hi @Turing-Chu! That sounds like a great idea, but such a thing would require additional expression storage on the decimal struct level, thus it will potentially increase the memory usage and I think most of the decimal lib users don't care about such feature. Maybe there is a way to implement it without additional storage, but I need to think about that. Anyways, thanks for the idea!