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).

On Sunday, 15 May 2022 at 13:26:30 UTC, vit wrote:

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.

On Monday, 16 May 2022 at 09:46:57 UTC, IGotD- wrote:

Here's the implementation if anyone needs it:

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

Should be fairly straightforward to implement.

On 5/15/22 9:26 AM, vit wrote:

https://code.dlang.org/search?q=decimal

-Steve

On Monday, 16 May 2022 at 09:59:41 UTC, bauss wrote:

Thanks, but it is not full implementation of decimal, arithmetic operator are missing.

On Monday, 16 May 2022 at 16:41:33 UTC, Steven Schveighoffer wrote:

Thanks, most of the packages are incomplete or too old (doesn't compile), but this one https://code.dlang.org/packages/decimal can by modified to work for my use.