Re: Exception question

From:
Salt_Peter <pj_hern@yahoo.com>
Newsgroups:
comp.lang.c++
Date:
Wed, 6 Aug 2008 01:53:52 -0700 (PDT)
Message-ID:
<0e586bd6-1310-4afd-a4be-c3c4821506cf@y38g2000hsy.googlegroups.com>
On Aug 6, 1:52 am, junw2...@gmail.com wrote:

class A
{
public:
     A() { p_a = new int;}
     ~A() { delete p_a; } //Line1
private:
     int *p_a;

}

void f()
{
     try
     {
           A a1;
           cout << "In f()" << endl;
          g(); //Line2
          A a2;
     }
     catch()
     {
          cout << "In catch" << endl;
     }

}

void g()
{
       cout << "In g()" << endl;
      throw; //Line3

}

When an exception is thrown at Line3 in g(), stack will unwind at
Line2 in f(). When a1 is destructed, will Line1 be excecuted so that
p_a is deleted? How about a2?

Thanks.

}


When in doubt, prove it:

#include <iostream>

class A
{
  int* p_a;
public:
  A() : p_a(new int) { std::cout << "A()\n"; }
  ~A()
  {
    delete p_a;
    std::cout << "~A()\n";
  }
};

void g()
{
  std::cout << "In g()" << std::endl;
  throw 1; //Line3
}

void f()
{
  try
  {
    A a1;
    std::cout << "In f()" << std::endl;
    g(); //Line2
    A a2;
  }
  catch(...)
  {
    std::cout << "In catch" << std::endl;
  }
}

int main()
{
  f();
}

/*
A()
In f()
In g()
~A()
In catch
*/

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