Re: std::vector : begin, end and insert - Using Objects instead of ints
Noted. Thanks!
"Doug Harrison [MVP]" <dsh@mvps.org> wrote in message
news:pf0q13tepqod7palfqtg48lmm0mh2v5qlp@4ax.com...
On Wed, 11 Apr 2007 06:01:46 -0700, "Nobody" <Nobody@yahoo.com> wrote:
3. To get the value corresponding to an iterator, dereference it.
That will fail, unless it is an integer vector.
Incorrect.
MrAsm showed me the correct way.
for(m_Iter = m_Pts.begin(); m_Iter != m_Pts.end(); ++m_Iter)
{
// CPoint& rPt = m_Pts.at(*m_Iter); //Fails
TRACE("Pt.x %d, Pt.y %d\n", (*m_Iter).x, (*m_Iter).y); //This is the
correct way.
}
I was unfamiliar with the (*m_Iter) logic.
The examples only show integer vectors.
It is more common to write m_Iter->x. The syntax (*m_Iter).x is
equivalent;
it dereferences the iterator and then selects a member using the dot. The
-> syntax is a shorthand for this but doesn't require the parens the
latter
needs due to the relative precedence of the two operators it uses.
--
Doug Harrison
Visual C++ MVP
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