临时对象

临时对象

 

#include <iostream>
#include <cstring>

 

using namespace std;

 

class Bar {
public:
    Bar(const char* _name) {
        cout << "ctor" << endl;
        strcpy(name, _name);
    }
    Bar(const Bar& other) {
        cout << "cp ctor" << endl;
        strcpy(name, other.name);
    }
    virtual ~Bar() {
        cout << "dtor" << endl;
    }

 

    const char* getName() const{
        return name;
    }

 

    void setName(const char* _name) {
        strcpy(name, _name);
    }
   
    char name[256];
};

 

Bar foo() {
    return Bar("bar");
}

 

int main() {
    Bar bar(foo());
    cout << foo().getName() << endl;
    return 0;
}

 

在VC和GCC中都没有调用过 copy constructor

 

输出

ctor
ctor
bar
dtor
dtor