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destroying a weldjoint created in one method in another

codologist (1)
I am trying to make a method (destroyWeldJoint) that destroys weldjoints from a copied set. The joints were originally created in another method (createWeldJoint). Please see the code below:
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-(void) createWeldJoint {

// using the iterator pos over the set
std::set<BodyPair *>::iterator pos;

for(pos = bodiesForJoints.begin(); pos != bodiesForJoints.end(); ++pos)
{

    b2WeldJointDef      weldJointDef;

    BodyPair            *bodyPair = *pos;
    b2Body              *bodyA = bodyPair->bodyA;
    b2Body              *bodyB = bodyPair->bodyB;


    weldJointDef.Initialize(bodyA,
                            bodyB,
                            bodyA->GetWorldCenter());
    weldJointDef.collideConnected = false;
    weldJoint = (b2WeldJoint*) world->CreateJoint(&weldJointDef);

    // Free the structure we allocated earlier.
    free(bodyPair);

    // Remove the entry from the set.
    //bodiesForJoints.erase(pos);

}

// copy of bodiesForJoints
std::set<BodyPair *> bodiesForJointsCopy(bodiesForJoints.begin(), bodiesForJoints.end());

bodiesForJoints.clear();

}


destroyWeldJoint:
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- (void) destroyWeldJoint    {
std::set<BodyPair *>::iterator pos;

for(pos = bodiesForJointsCopy.begin(); pos != bodiesForJointsCopy.end(); ++pos)
{

    BodyPair            *bodyPair = *pos;
    b2Body              *bodyA = bodyPair->bodyA;
    b2Body              *bodyB = bodyPair->bodyB;

    // weldjoint should be destroyed here


    // Free the structure we allocated earlier.
    free(bodyPair);

}    
}


How can I destroy the weldjoint (in createWeldJoint) in the destroyWeldJoint method?
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