Default template parameters with forward declaration?

Any compilation unit that uses your facility that forward-declares boost stuff will need to include the boost headers anyway, except in the case that you have certain programs that won't actually use the boost part of your facility.

I don't think you can forward declare a template with default arguments unless the library in question provided its own forward declaration header. This is because you can't respecify the default arguments (even if they match... gcc will still report “error: redefinition of default argument�).

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