Delphi Error – E2553 Class type constraint cannot be specified more than once

Delphi 20 Views 1 Min Read

Delphi Compiler Error

E2553 Class type constraint cannot be specified more than once

Reason for the Error & Solution

This occurs when trying to specify the type constraint for the generic type more than once. 

program E2553;

{$APPTYPE CONSOLE}

uses
  SysUtils;

type
  TBaseClass = class
  end;

  TNewClass = class(TBaseClass)
  end;

  TTestClass<TC: TBaseClass, TNewClass> = class //E2553

  end;
begin
Tags: