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Date: Fri, 6 Apr 2018 13:37:57 -0700 (PDT)
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Subject: Re: Standard."-" provided to "with function "-" (VAL1 : in
 VALUE_TYPE) return VALUE_TYPE is <>;" refused:
From: AdaMagica <christ-usch.grein@t-online.de>
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Xref: reader02.eternal-september.org comp.lang.ada:51362
Date: 2018-04-06T13:37:57-07:00
List-Id: <comp.lang.ada>

Am Freitag, 6. April 2018 19:20:23 UTC+2 schrieb Mehdi Saada:
> The parameter is
>    with function "-" (VAL1 : in VALUE_TYPE) return VALUE_TYPE is <>;
> from the (simplified) package
> generic
>    type VALUE_TYPE is private;
>    with function "-" (VAL1 : in VALUE_TYPE) return VALUE_TYPE is <>;
> package NUMERIC_SIGNATURE is end Numeric_Signature;
> 
> The instantiation is:
> package P_Num is new NUMERIC_SIGNATURE (VALUE_TYPE => Float);
> Package_needing_a_numeric_signature is new SPREADSHEETS.Formula_Cells (P_NUM);
> 
> why do I have:
> instantiation error
>  operator "-" not defined for type "VALUE_TYPE" defined at ...
> gprbuild: *** compilation phase failed
> And putting "-" => Standard."-" "association not allowed for overloaded formal"
> 
> ... Isn't able to choose the "-" with the right parameters number ?!

The operators for Float in Standard are intrinsic. Guess this is the reason why.