non-member function ‘size_t capacity()’ cannot have cv-qualifier

字面意思是非成员函数不能定义cv限定符，比如说friend函数，就不能加const和valitale。

functions.cc:60:18: error: non-member function ‘size_t capacity()’ cannot have cv-qualifier
60 | size_t capacity()const
| ^~~~~
functions.cc: In function ‘size_t capacity()’:
functions.cc:62:9: error: ‘cap’ was not declared in this scope
62 | return cap - elements;
| ^~~
functions.cc:62:15: error: ‘elements’ was not declared in this scope
62 | return cap - elements;
| ^~~~~~~~

今天是因为定义了一个非成员函数的函数吗？但是自己看却是加了类限定符的，class_name::，而且函数没有半点错误，找半天原来多定义了一次成员函数，第二个成员函数没问题，但是第一个，没有加类名限定符（却加了const），所以系统报错。真是百密一疏呀。

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non-member function ‘size_t capacity()’ cannot have cv-qualifier

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