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AScan generic and codeblock types 02 Dec 2022 11:59 #24614

  • bmellac
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  • Hi all,

    I've got a quick syntaxic question about how to use generic functions.
    In our project we now have a compilation error (Xsharp 2.13) that wasn't happenning in 2.12.
    Erreur	XS1503	Argument 1: cannot convert from 'array of<ArtDet>' to 'array'

    The culprit is there :
    LOCAL aArtDetList		AS ARRAY OF ArtDet
    AScan( aArtDetList, { |oItem AS ArtDet| oItem:CodeArt == oArtLivr:CODEART .AND. oItem:EtatOccaz == oArtLivr:ETATOCCAZ } )
    So aArtDetList is a typed list and it bothers AScan.
    There is a generic version of AScan so I tried
    AScan<ArtDet>( aArtDetList, { |oItem AS ArtDet| oItem:CodeArt == oArtLivr:CODEART .AND. oItem:EtatOccaz == oArtLivr:ETATOCCAZ } )
    But then I've got
    Erreur	XS1503	Argument 2: cannot convert from 'codeblock' to 'ArtDet'
    FIne ! then I don't need to type oItem as it should infer from the generic type right ?
    AScan<ArtDet>( aArtDetList, { |oItem| oItem:CodeArt == SELF:oFacDet:CODEART .AND. oItem:EtatOccaz == SELF:oFacDet:ETATOCCAZ } )
    ... nope :
    Erreur	XS1061	'usual' does not contain a definition for 'CodeArt' and no accessible extension method 'CodeArt' accepting a first argument of type 'usual' could be found

    Should I translate the codeblock as a lambda function (I'd rather not)

    Regards

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    AScan generic and codeblock types 02 Dec 2022 12:20 #24615

    • robert
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  • Basile,

    Yes, the best solution is to create a lambda or a function

    If you have an ARRAY OF <Something> then there are the following options for AScan():
    FUNCTION AScan<T>(aTarget AS ARRAY OF<T>,act AS Func<T, LOGIC>)  AS DWORD
    FUNCTION AScan<T>(aTarget AS ARRAY OF<T>,act AS Func<T, LOGIC>,nStart AS LONG) AS DWORD
    FUNCTION AScan<T>(aTarget AS ARRAY OF<T>,act AS Func<T, LOGIC>,nStart AS LONG, nCount AS LONG) AS DWORD

    The Func<T> is either a lambda expression or the name of a function that accepts an object of type T and returns a logic
    Instead of the Func<T> you can also pass an object that you want to look for
    FUNCTION AScan<T>(aTarget AS ARRAY OF<T>,uSearch AS T) AS DWORD

    The lambda solution would look like this (unchecked):
    AScan( aArtDetList, { oItem => oItem:CodeArt == oArtLivr:CODEART .AND. oItem:EtatOccaz == oArtLivr:ETATOCCAZ })

    The function approach would only work if oArtLivr is also visible to the function.

    Robert
    XSharp Development Team
    The Netherlands

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    AScan generic and codeblock types 02 Dec 2022 12:54 #24618

    • bmellac
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  • Thanks Robert !

    Just to be sure to understand : codeblock is not possible because it can only return USUAL by design so it won't be able to match the AScan<T> pickedup by the compiler because aArtDetList is of type Array<ArtDet> right ?
    If aArtDetList was of type Array than the USUAL overload would have been chosen and the codeblock would have been valid ?

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    AScan generic and codeblock types 02 Dec 2022 13:23 #24620

    • robert
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  • Basile,

    Thanks Robert !

    Just to be sure to understand : codeblock is not possible because it can only return USUAL by design so it won't be able to match the AScan<T> pickedup by the compiler because aArtDetList is of type Array<ArtDet> right ?
    If aArtDetList was of type Array than the USUAL overload would have been chosen and the codeblock would have been valid ?
    That is correct.
    Robert
    Robert
    XSharp Development Team
    The Netherlands

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