[Gambas-user] Constant expressions

[Fabien Bodard]

forget It's not the same query ... again I'm too  fast in my reading ...
fufufu

Nevertheless I continue to think that Def will be useful

Le mer. 13 oct. 2021 à 10:32, Fabien Bodard <gambas.fr at gmail.com> a écrit :

> Found it !!! BugTraker Request #775 :-D
>
> Le mer. 13 oct. 2021 à 10:11, Fabien Bodard <gambas.fr at gmail.com> a
> écrit :
>
>> 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
>>
>
>
> --
> Fabien Bodard
>


-- 
Fabien Bodard
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