COMP6771 Week 9.2

Revision

std::forward

Hidden friends

• Because of ADL, the compiler looks inside the class of the arguments
• Hidden friends prevent implicit conversions
  • A function that would be viable via conversion cannot be found, because ADL doesn't look inside the class
• Declaring a friend inside the class doesn't solve this issue, because the definition is external (and hence available to ADL)
• https://www.justsoftwaresolutions.co.uk/cplusplus/hidden-friends.html

Function callbacks with std::function

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Lvalues and rvalues

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