The comparison function in sort compare

Source: Internet
Author: User

The comparison function in sort compare to be declared as a static member function or a global function, not as a normal member function, otherwise an error is made: invalid use of non-static member function

Because a non-static member function is dependent on a specific object, and the Std::sort function is global, the non-static member function cannot be called in the sort. Static member functions or global functions are independent of the object and can be accessed independently without creating any object instances. Static member functions can not invoke non-static members of the class at the same time.

     staticbool Compare (stringstring &s2)    {         return s1 + s2 > s2 + s1;    }

The comparison function in sort compare

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