Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
The error message seems to be little mis-leading with the scenario, when we try to delete a virtual method.
prog.cpp:4:16: error: deleted function 'virtual void Test::foo()'
prog.cpp:8:2: error: used here
Code
struct Test : public Base
{
Test() {}
virtual void foo () = delete; // error
};
Are virtual method not deleteable for the same reason, why they cannot remain unimplemented in C++03 ? Is there any way to mention that Test purposely not implementing virtual foo() ?
The term use has a concrete definition in the standard, and in particular for virtual functions the definition of odr-used is:
Where odr-used is a new term in the upcoming standard that refers to what the previous standard called plainly used:
My take is that the error message employs the term used to refer to odr-used in this particular case, and yes, the reason why this is a violation is exactly the same reason by which you cannot leave a non-pure virtual member function unimplemented.