What is the preferred way of storing currencies?

Development Programming & Scripting C++
1

Hi All,

Couldn’t find anything in the UE4 documentation regarding storing currencies.

Is that correct that there’s no anything like Decimal type in Python?

Should I use a third party solution like this one?

Thanks!

2

I think you best shot it to use a library like the one you provided.

3

I have implemented my own class in a plugin for this.
I’ve added to the Engine some month ago, I have a FDecimal type which uses Intel’s RDFP Math Library which is IEEE-754 compliant: Intel® Developer Zone

It works exactly like C# Decimal type; can store up to 29 digits of a decimal value, like:

FDecimal Gold = FDecimal(“999.999.999.999.999.999.999.999.999,99”);

Gold -= 5000;
Gold += 5.0;

Can convert from FString, int32, uint32, int64, uint64, float or double, all to decimal…
It is serializing correctly, I just didn’t work on optimizing network Replication for it just yet.
I did this stuff because storing “coins” or any real world currency as float or double is really really a bad idea :slight_smile:

Too bad C++ doesn’t have this kind of thing built-in:/

4

Thanks for the replies!

Bruno, do you plan to publish the plugin on GitHub? I am planning to just go with the solution I’ve posted in the topic post and use strings for replication.

I don’t think decimal type should be in C++ standard libraries but was surprised that it is not among Unreal Engine types.

Thanks again!