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copied!<p>I think you're making an assumption that's probably false: that the crash happens after having <strong>successfully</strong> checked <code>myIt != m_myMap.end() && myIt->second.userStatus</code> in the same iteration. I'd bet that the crash immediately follows the first time these values are examined. It's the optimizer that makes it look like you've cleared the first two <code>if</code> conditions.</p> <p>Try putting a completely different code block into the loop and see if it crashes there (my bet is that it would -- I don't think you'll see the output from <code>cerr</code> immediately preceding a crash.)</p> <pre><code>// New code block MyMapIterator yourIt = m_myMap.find(otherID); if (yourIt != m_myMap.end() && yourIt->second.userStatus == STATUS_A || yourIt->second.userStatus == STATUS_B) { cerr << "Hey, I can print something! " << std::ios::hex << this << endl; } // Original code MyMapIterator myIt = m_myMap.find(otherID); if (myIt != m_myMap.end() && myIt->second.userStatus == STATUS_A) { //Prints stuff. No side-effects whatsoever. } else if (myIt != m_myMap.end() && myIt->second.userStatus == STATUS_B && myIt->second->foo == FOO_A) { //Prints stuff. No side-effects whatsoever. } else if (myIt != m_myMap.end() && myIt->second.userStatus == STATUS_B && myIt->second->foo == FOO_B && /*other meaningless conditions */) { //Prints stuff. No side-effects whatsoever. } </code></pre>

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