{"action":"created","comment":{"url":"https://api.github.com/repos/VoltDB/voltdb/pulls/comments/29624378","id":29624378,"diff_hunk":"@@ -300,9 +303,15 @@ class ExecutorVector {\n \n ExecutorVector::~ExecutorVector()\n {\n+    // We could avoid having call delete here if we stored an instance in the\n+    // map, rather than a pointer to it?\n+    //\n+    // Also, why do we need to call erase here?\n     map<int, vector<AbstractExecutor*>* >::iterator it = m_subplanExecListMap.begin();\n     while (it != m_subplanExecListMap.end()) {\n         vector<AbstractExecutor*>* executorList = it->second;\n+        // Note: we need to increment the iterator here\n+        // to avoid invalidating it.","path":"src/ee/execution/VoltDBEngine.cpp","position":22,"original_position":22,"commit_id":"4c0f58c1dc8cd5f0a5e348a1898bd10c024cba3e","original_commit_id":"4c0f58c1dc8cd5f0a5e348a1898bd10c024cba3e","user":{"login":"wolffcm","id":7902964,"avatar_url":"https://avatars.githubusercontent.com/u/7902964?v=3","gravatar_id":"","url":"https://api.github.com/users/wolffcm","html_url":"https://github.com/wolffcm","followers_url":"https://api.github.com/users/wolffcm/followers","following_url":"https://api.github.com/users/wolffcm/following{/other_user}","gists_url":"https://api.github.com/users/wolffcm/gists{/gist_id}","starred_url":"https://api.github.com/users/wolffcm/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wolffcm/subscriptions","organizations_url":"https://api.github.com/users/wolffcm/orgs","repos_url":"https://api.github.com/users/wolffcm/repos","events_url":"https://api.github.com/users/wolffcm/events{/privacy}","received_events_url":"https://api.github.com/users/wolffcm/received_events","type":"User","site_admin":false},"body":"Maybe this comment is confusing.  If one just does `erase(it)`, then `it` is invalidated, and attempting to increment an invalid iterator leads to crashes, etc.  Doing `erase(it++)` means that the iterator is incremented before `erase` completes, so the iterator is still valid on the next iteration of the loop.\r\n\r\nI had originally tried to restructure this loop to a more familiar idiom, but ran into this problem, so I just added the comment for clarity.\r\n\r\n\r\n","created_at":"2015-05-04T21:14:14Z","updated_at":"2015-05-04T21:14:14Z","html_url":"https://github.com/VoltDB/voltdb/pull/2298#discussion_r29624378","pull_request_url":"https://api.github.com/repos/VoltDB/voltdb/pulls/2298","_links":{"self":{"href":"https://api.github.com/repos/VoltDB/voltdb/pulls/comments/29624378"},"html":{"href":"https://github.com/VoltDB/voltdb/pull/2298#discussion_r29624378"},"pull_request":{"href":"https://api.github.com/repos/VoltDB/voltdb/pulls/2298"}}},"pull_request":{"url":"https://api.github.com/repos/VoltDB/voltdb/pulls/2298","id":34575808,"html_url":"https://github.com/VoltDB/voltdb/pull/2298","diff_url":"https://github.com/VoltDB/voltdb/pull/2298.diff","patch_url":"https://github.com/VoltDB/voltdb/pull/2298.patch","issue_url":"https://api.github.com/repos/VoltDB/voltdb/issues/2298","number":2298,"state":"open","locked":false,"title":"Review EE code in subquery branch","user":{"login":"wolffcm","id":7902964,"avatar_url":"https://avatars.githubusercontent.com/u/7902964?v=3","gravatar_id":"","url":"https://api.github.com/users/wolffcm","html_url":"https://github.com/wolffcm","followers_url":"https://api.github.com/users/wolffcm/followers","following_url":"https://api.github.com/users/wolffcm/following{/other_user}","gists_url":"https://api.github.com/users/wolffcm/gists{/gist_id}","starred_url":"https://api.github.com/users/wolffcm/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wolffcm/subscriptions","organizations_url":"https://api.github.com/users/wolffcm/orgs","repos_url":"https://api.github.com/users/wolffcm/repos","events_url":"https://api.github.com/users/wolffcm/events{/privacy}","received_events_url":"https://api.github.com/users/wolffcm/received_events","type":"User","site_admin":false},"body":"Not many changes here, I just added some comments to clarify my understanding of the 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