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class A
{
public:
int a;
A operator+(const A &a)
{
A res;
res.a = this->a+a.a;
return res;
}
};
int main()
{
A a1,a2;
a1.a = 1;
a2.a = 2;
A a3 = a1 + a2;设断点调试时this->a的值为1
return 0;
}