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Quá trình sắp xếp của bạn cuối cùng sẽ là công cụ hữu ích nhất trong hộp công cụ của bạn. Tham chiếu này nhanh chóng PHP cấu hình bao gồm các thiết lập chung quan trọng nhất bạn | 209z516 include cstdlib include iostream using namespace std A proxy class for sums of vectors template class size_t class MyVectorSum template class T size_t N class MyVector T data N public MyVector T N operator const MyVector T N right for size_t i 0 i N i data i right.data i return this MyVector T N operator const MyVectorSum T N right const T operator size_t i const return data i T operator size_t i return data i Proxy class hold references uses lazy addition template class T size_t N class MyVectorSum const MyVector T N left const MyVector T N right public MyVectorSum const MyVector T N lhs const MyVector T N rhs left lhs right rhs T operator size_t i const return left i right i Operator to support v3 v1 v2 template class T size_t N MyVector T N MyVector T N operator const MyVectorSum T N right for size_t i 0 i N i data i right i return this operator just stores references template class T size_t N inline MyVectorSum T N operator const MyVector T N left const MyVector T N right return MyVectorSum T N left right Convenience functions for the test program below template class T size_t N void init MyVector T N v for size_t i 0 i N i v i rand 100 template class T size_t N void print MyVector T N v for size_t i 0 i N i 210z516 cout v i cout endl int main MyVector int 5 v1 init v1 print v1 MyVector int 5 v2 init v2 print v2 MyVector int 5 v3 v3 v1 v2 print v3 MyVector int 5 v4 Not yet supported v4 v1 v2 v3 - Comment The MyVectorSum class does no computation when it is created it merely holds references to the two vectors to be added. It is only when you access a component of a vector sum that it is calculated see its operator . The overload of the assignment operator for MyVector that takes a MyVectorSum argument is for an expression such as Comment v1 v2 v3 add two vectors When the expression V1 V2 is evaluated a MyVectorSum object is returned or actually inserted inline since that operator is declared inline . This is a small fixed-size object it holds only two .
