Effective clause 15, carefully copying behavior in the resource management class

Class A{private:int *p;void Lock () {cout << P << "is lock" << Endl;} void Unlock () {cout << P << "is Non-lock" << Endl;} Public:a (int* a):p (a) {lock (); ~a () {unlock ();}}; int main () {int a1 = 1; A (&A1); A B (a);}

Results

A A, a, two object, based on the post-construction of the first destructor. B is broken down, and then A is refactored, causing the program to crash.

Here are two great ways to do this:

1) Prohibit copy (copy constructor and operator= in private)

2) pointer with Count function for the Shared_prt class

........... There's no going back.

Effective clause 15, carefully copying behavior in the resource management class