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    Delphi Error – E2514 Type parameter ‘%s’ must support interface ‘%s’

    admin November 17, 2022 No Comments

    Delphi Compiler Error

    E2514 Type parameter ‘%s’ must support interface ‘%s’

    Reason for the Error & Solution

    This occurs when the type constraint for T is not satisfied (here, to implement IComparable). 

    program E2514;

{$APPTYPE CONSOLE}

uses
  SysUtils;

type
  TMyClass = class
  end;

  IMyGenericInterface<T: IComparable> = interface
  end;

var
  genVar: IMyGenericInterface<TClass>;

begin
  Writeln('E2514 Type parameter ''%s'' must support interface ''%s''');
end.

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