b2Island::Report() doesn't say how many impulses are set for b2ContactImpulse

What steps will reproduce the problem?
1. setup world etc..
2. set contact listener 
3. implement postsolve

What is the expected output? What do you see instead?
not all impulses are set for the b2ContactImpulse parameter. I expect them to 
be set.

What version of the product are you using? On what operating system?
2.1.2 & I checked out from svn to double check if the report function has 
changed. Which it has not.

Please provide any additional information below.

[code]
void b2Island::Report(const b2ContactConstraint* constraints)
{
    if (m_listener == NULL)
    {
        return;
    }

    for (int32 i = 0; i < m_contactCount; ++i)
    {
        b2Contact* c = m_contacts[i];

        const b2ContactConstraint* cc = constraints + i;

        b2ContactImpulse impulse;
// sometimes cc->pointCount (vc is used for the version I'm using) is 1
// but impulse.normalImpulses is b2_maxManifoldPoints elements big (which is by 
default 2).
// when I get the postsolve event there is know easy way to know how many 
// normalImpulses are set. Atleast all the tutorials I have seen
// dont even address the issue :( they must have been lucky
// cause I get large numbers for the  normalImpulses[1]
// it worked fine on the iPhone for some strange reson
        for (int32 j = 0; j < cc->pointCount; ++j)
        {
            impulse.normalImpulses[j] = cc->points[j].normalImpulse;
            impulse.tangentImpulses[j] = cc->points[j].tangentImpulse;
        }

        m_listener->PostSolve(c, &impulse);
    }
}
[/code]

Solution 1: add a count to b2ContactImpulse
Solution 2 (hackish): set the impulses to 0 first

I did solution 2;
[code]
        for(int i =0; i < b2_maxManifoldPoints; i++)
            impulse.normalImpulses[i] = 0;
[/code]
And my game more closely matched the iphone results interms of things exploding.

Original issue reported on code.google.com by openem...@gmail.com on 11 Aug 2011 at 5:33

behdad / box2d

b2Island::Report() doesn't say how many impulses are set for b2ContactImpulse #229