Is there any overhead in using a default capture mode?

```
{
   Foo foo = ...;
   Bar bar = ...;
   [&]()
   {
       write(foo);
   }
}

{
   Foo foo = ...;
   Bar bar = ...;
   [&foo]()
   {
       write(foo);
   }
}

```

To clarify is there any cost in using the former related to bar being capture even if not used?