Unchecked integer conversions

[AnthonyDGreen]

No description provided.

[KlausLoeffelmann]

What is the difference between this and #82?
If it is about unchecked/checked, aren't the compiler options sufficient to control this?
(Maybe I have not understood the background enough.)

[xieguigang]

Hi, @KlausLoeffelmann unchecked/checked compiler options just working on the constant like enum in the compiling time, but not working on the vb runtime, if a integer variable its actual value is larger than its greatest value, then this still caused the vb program crashed at runtime.

One of the example is the hash algorithm that using the unchecked overflows, and actually this can not working in vb directly yet, but can be simulated using BigInteger. Example like blizzard hash using unchecked int64 in vb using BigInteger to simulate the unchecked, but it is still not so convenient and did not working properly.

[KlausLoeffelmann]

Although I never tried this, I had this in mind. Are we talking about the same? If we do, do we need to update the description of that document?

https://docs.microsoft.com/en-us/dotnet/visual-basic/reference/command-line-compiler/removeintchecks

[xieguigang]

Probably doing something like C# unchecked in vb:

Dim i% = Integer.MaxValue

UnChecked
    i += 10
End UnChecked

Console.WriteLine(i)