[Gambas-user] Constant expressions

[Fabien Bodard]

Enfin !!!

mdr 4 month you say 😂... well hum... If I remember well I've querying that
during my first attempt on the gb.form.terminal.

So ... Thank you a lot !!!

Le mer. 13 oct. 2021 à 00:32, Brian G <brian at westwoodsvcs.com> a écrit :

> This is amazing! Thank you so much!
>
> "Failure is the key to success;
>  each mistake teaches us something"  .. Morihei Ueshiba
> Brian G
>
> ----- On Oct 12, 2021, at 6:00 AM, Benoît Minisini g4mba5 at gmail.com wrote:
>
> > Hi,
> >
> > I have implemented in the compiler the ability to use "constant
> > expressions".
> >
> > Constant expressions are integer expressions that are evaluated at
> > compile time, and that can be used in the following places:
> >
> > - Constant declarations.
> >
> > - Enumeration declarations.
> >
> > - Embedded array declarations.
> >
> > These expressions only support a subset of Gambas operators and
> > pre-defined constants.
> >
> > Here is the list of what you can use inside a constant expression:
> >
> > - Arithmetic operators: +, -, *, /, \, Div, %, Mod
> >
> > - Logical operators: And, Or, Xor, Not
> >
> > - Bitwise operators: Shl, Shr, Asl, Asr, Lsl, Lsr
> >
> > - Size of a native numerical or date datatype: SizeOf()
> >
> > - Native datatype constants : gb.Boolean, gb.Byte, gb.Short, gb.Integer,
> >   gb.Long, gb.Single, gb.Float, gb.Date.
> >
> > - Another integer constant.
> >
> > WARNING! In the context of constant integer expressions, The / operator
> > acts like the integer division operator \.
> >
> > Note that the bitwise operators now can used like... operators, and must
> > be used that way in the context of constant integer expressions
> >
> > Here are some examples:
> >
> >   Public Const Alpha As Integer = 1
> >   Public Const Beta As Integer = (Alpha * 2) + 1
> >   Public Const Delta As Byte = Beta + Alpha
> >
> >   Private Enum FirstFlag = 1 Shl 0, SecondFlag = 1 Shl 1,
> >     ThirdFlag = 1 Shl 2
> >
> >   Private SomeEmbeddedArray[Delta * SizeOf(gb.Short)] As String
> >
> > The corresponding documentation is available in the wiki here:
> >
> > https://gambaswiki.org/edit/lang/constexpr
> >
> > Enjoy it!
> >
> > --
> > Benoît Minisini
> >
> > ----[ http://gambaswiki.org/wiki/doc/netiquette ]----
>
> ----[ http://gambaswiki.org/wiki/doc/netiquette ]----
>


-- 
Fabien Bodard
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