HomeDelphiDelphi Error – E2513 Type parameter ‘%s’ must have one public parameterless constructor named Create

Delphi Error – E2513 Type parameter ‘%s’ must have one public parameterless constructor named Create

Delphi Compiler Error

E2513 Type parameter ‘%s’ must have one public parameterless constructor named Create

Reason for the Error & Solution

This occurs when a generic type doesn’t have a public parameterless constructor.

program E2513;

{$APPTYPE CONSOLE}

uses
  SysUtils;

type
  TMyClass = class
  private
    constructor Create();
  end;

  TMyGenericClass<T: constructor> = class
  end;

constructor TMyClass.Create();
begin
  //
end;

var
  GenObj: TMyGenericClass<TMyClass>;
  anObj: TMyClass;

begin
   anObj := TMyClass.Create();
   Writeln('E2513 Type parameter ''%s'' must have one public parameterless constructor named Create');
end.

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