关于c++编译报隐式删除的错误

1.这个问题可能是父类对于某种方法设置了=delete 或者是private

2.某些拷贝构造函数报这种错误，可能是因为某些成员变量自身不支持拷贝导致的

1

I have class looks as follows in .h file (Header)

#include <boost/thread.hpp>

class MyClass{

    private:
        boost::mutex bPoolMtx_;

        // ... other vars
    public:
        // public vars and methods

}

I get the following error trying to build/ compile.

MyClass.h:38:7: note: ‘MyClass::MyClass(const MyClass&)’ is implicitly deleted because the default definition would be ill-formed:
MyClass.h:38:7: error: use of deleted function ‘boost::mutex::mutex(const boost::mutex&)’

I don't use the mutex at all in the cpp file yet. When I comment out the boost::mutex line it builds fine. What is going on?

 

 

1 Answer

activeoldestvotes

5

 

The default copy constructor generated by the compiler copies all data members by default. Your use of boost::mutex throws an error because the mutex isn't copyable.

You can write your own copy constructor that doesn't attempt to copy the mutex or simply delete the copy constructor for MyClass.

#include <boost/thread.hpp>

class MyClass{
    private:
        boost::mutex bPoolMtx_;

        // ... other vars
    public:
        // public vars and methods
        MyClass(const MyClass&) = delete;
}