C#•2y ago

✅ Using System.Collections.Generic Wide-ranging Type? (T), but limiting to fewer options

For example, I'd like to create an Add method, that works for int, double, decimal and float. I'd write

public static T Add<T>(T a, T b)
{
  return (a+b);
}

public static T Add<T>(T a, T b)
{
  return (a+b);
}

But how do I limit T to only the aforementioned four numeric types? Relevant information is appreciated!

12 Replies

Thinker•2y ago

If you're using .NET 7

using System.Numerics;

public static T Add<T>(T a, T b) where T : INumber<T>
{
    return a + b;
}

using System.Numerics;

public static T Add<T>(T a, T b) where T : INumber<T>
{
    return a + b;
}

NoraOP•2y ago

I'm using .NET 8.0

Thinker•2y ago

Preview?

NoraOP•2y ago

Sorry, what do you mean?

Thinker•2y ago

The latest stable .NET version is 7 So if you're using .NET 8 it's a beta/preview version In any case, if you're using a version >= 7 then INumber<T> should be available

NoraOP•2y ago

Oh, might be. I read in the "terminal?" that "XYZ feature isn't available in .NET 8.0, only available in .NET 9.0", not the exact wording, but you get it.

Thinker•2y ago

Okay, can you do dotnet --list-sdks and post the output

NoraOP•2y ago

Oh, I've seen the "where" keyword occasionally on Microsoft examples, seems like would be an interesting thing to learn Sure

Thinker•2y ago

Actually I think you're just using a lower language version. That error occurs when you try using a feature from a language version that is greater than the one you're currently using.

NoraOP•2y ago

lmao, it is 5.0.408 😂

Thinker•2y ago

yeah there's issue #1 probably As mentioned, .NET 7 is the latest version, there's no reason to use 5 anymore

NoraOP•2y ago

Thanks! I'll try to update it If my potato laptop doesn't crash by then

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✅ Using System.Collections.Generic Wide-ranging Type? (T), but limiting to fewer options