E2513 Type parameter '%s' must have one public parameterless constructor named Create (Delphi)

Go Up to Error and Warning Messages (Delphi) Index

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.