decimal type in d

[bauss]

On Monday, 16 May 2022 at 09:46:57 UTC, IGotD- wrote:
> On Sunday, 15 May 2022 at 13:26:30 UTC, vit wrote:
>> Hello, I want read decimal type from sql db, do some 
>> arithmetic operations inside D program and write it back to 
>> DB. Result need to be close to result as if this operations 
>> was performed in sql DB. Something like C# decimal.
>> Exists this kind of library ind D? (ideally `pure @safe @nogc 
>> nothrow`).
>
> This also something I wondered, it should be standard in the D 
> library. Implementing it can be done straight forward with 
> existing D language primitives, essentially a struct.
>
> For those who don't know, decimal in C# is like a floating 
> point value but the exponent is a power of 10 (internally total 
> 16 bytes). This means that for "simple" mathematics rational 
> decimal values remains rational decimals values and not some 
> rounded value that would happen if you would use normal 
> floating point values. The decimal type is essential for 
> financial calculations.
>
> I think D can more or less copy the C# solution.

Here's the implementation if anyone needs it:

https://referencesource.microsoft.com/#mscorlib/system/decimal.cs,1b2858baf311cbf9

Should be fairly straightforward to implement.