Re: [Boost-users] boost::exception - leaking error_info

21 Feb 2009

      On Fri, Feb 20, 2009 at 3:00 PM, Bruce Laing
 wrote:
...
This program seems to be leaking boost::exception::error_info objects.
Is there something missing here?
- Bruce
typedef boost::error_info< struct tag_my_error, std::string >
some_error_info;
struct an_exception : public boost::exception, public std::exception {};
void throw_func()
  {
      BOOST_THROW_EXCEPTION
      (
         an_exception()
             // no leak if next line is commented out.
             << some_error_info( std::string( "error message" ) )
      );
  }
.
.
.
  BOOST_AUTO_TEST_CASE( test_exceptions )
  {
      try
      {
          throw_func()
      }
      catch( an_exception&  )
      {
      }
  }
What platform? Do you have a complete program that shows the problem?

This test seems to work as expected:

#include "boost/exception.hpp"

class
counter
	{
	int & c_;
	counter & operator=( counter const & );

	public:

	explicit
	counter( int & c ):
		c_(c)
		{
		++c_;
		}

	counter( counter const & x ):
		c_(x.c_)
		{
		++c_;
		}

	~counter()
		{
		--c_;
		}
	};

typedef boost::error_info< struct tag_my_error, counter > some_error_info;

struct an_exception : public boost::exception, public std::exception {};

int c;

void
throw_func()
	{
	BOOST_THROW_EXCEPTION
		(
		an_exception() << some_error_info( counter(c) )
		);
	}

int
main()
	{
	c=0;
	try
		{
		throw_func();
		}
	catch( an_exception & )
		{
		assert(c>0);
		}
	assert(!c);
	}

Emil Dotchevski
Reverge Studios, Inc.
http://www.revergestudios.com/reblog/index.php?n=ReCode