c++ - 类中的 vector 在引用类中为空

Question

我可以将我的问题浓缩为以下问题:

Class1 x;
Class1 y;
x.Label = "Test";
y = x;
x.myVector.push_back("test");

结果: x.myVector.size() == 1，y.myVector.size() == 0，但两者都有标签“Test”!

我对 C++ 比较陌生，但不幸的是我无法通过在互联网上搜索来解决问题......

感谢您的帮助!

Answer 1

您的示例远未完成，因此我将假设最简单的编译方法:

// creates an instance named x on the stack
Class1 x; 

// creates an instance named y on the stack
Class1 y; 

// sets the label of the x instance to "Test"
x.Label = "Test"; 

// COPIES all data from x over to y (including the label)
y = x; 

// inserts into the vector of x, as the copy has gone through already, this is in x only
x.myVector.push_back("test");