我有类基,它只包含私有默认构造函数和公共删除的复制构造函数,没有别的.
class base {
private:
base() = default;
public:
base(const base&) = delete;
};
如果我尝试从base继承并创建一个派生类的实例,如下所示,g 4.8.2不会编译我的代码,但VC 2013会编译.
class derived : public base {
private:
derived() = default;
};
derived x;
那么,它是g或VC 2013中的一个错误只是忽略了什么？
这是完整的代码……
class base {
private:
base() = default;
public:
base(const base&) = delete;
};
class derived : public base {
private:
derived() = default;
};
derived x;
int main() {
}
…和g错误消息.
main.cpp:12:5: error: 'constexpr derived::derived()' is private
derived() = default;
^
main.cpp:15:9: error: within this context
derived x;
^
main.cpp: In constructor 'constexpr derived::derived()':
main.cpp:3:5: error: 'constexpr base::base()' is private
base() = default;
^
main.cpp:12:5: error: within this context
derived() = default;
^
main.cpp: At global scope:
main.cpp:15:9: note: synthesized method 'constexpr derived::derived()' first required here
derived x;
^
