C++ Patterns: The Badge

Re:C++ Patterns: The Badge by dearrifling on Wednesday June 12, 2019 @12:47AM (#20161849)

You can make register_device() an inline function that just calls a do_register_device() private function without the badge. That way you don't have to pay for the empty class.

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Re:C++ Patterns: The Badge by jcl on Wednesday June 12, 2019 @01:31AM (#20162016)

I'm not sure I follow... The motivation for Badge is to have methods on VFS that only Device can call, without exposing VFS's internals to Device. Without Badge, what prevents non-Device functions from calling register_device()?

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Re:C++ Patterns: The Badge by taylorconor on Wednesday June 12, 2019 @01:37AM (#20162038)

I guess the inline function would require a Badge and the private member function would not. So an inline constructed but never used Badge is even more likely to be completely optimized away

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Re:C++ Patterns: The Badge by dearrifling on Wednesday June 12, 2019 @01:41AM (#20162049)

Exactly.

https://godbolt.org/z/j-THTX

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