GitHub pull request #3500 of commit d2af8872904628d00ebaca69277c18b77a4187d8, no merge conflicts.sha1origin/pr/3500/mergeghprbActualCommitd2af8872904628d00ebaca69277c18b77a4187d8ghprbActualCommitAuthormasi19bwghprbActualCommitAuthorEmailmasi19bw@gmail.comghprbAuthorRepoGitUrlhttps://github.com/masibw/bcc.gitghprbTriggerAuthorghprbTriggerAuthorEmailghprbTriggerAuthorLoginyonghong-songghprbTriggerAuthorLoginMention@yonghong-songghprbPullId3500ghprbTargetBranchmasterghprbSourceBranchhash_of_map_custom_keyGIT_BRANCHhash_of_map_custom_keyghprbPullAuthorEmailmasi19bw@gmail.comghprbPullAuthorLoginmasibwghprbPullAuthorLoginMention@masibwghprbPullDescriptionGitHub pull request #3500 of commit d2af8872904628d00ebaca69277c18b77a4187d8, no merge conflicts.ghprbPullTitleAllow the use of custom keys in BPF_HASH_OF_MAPSghprbPullLinkhttps://github.com/iovisor/bcc/pull/3500ghprbPullLongDescriptionclose #3496 \r\nHi team. I wrote a macro that can use custom key for `BPF_HASH_OF_MAPS`.\r\n\r\nBut in c++, `get_map_in_map_table` is shared to `BPF_ARRAY_OF_MAPS`.\r\nSo, when using `BPF_ARRAY_OF_MAPS`, we have to declare like this.\r\n```\r\nauto t = bpf.get_map_in_map_table<int>(\"maps_array\");\r\n```\r\nIs it okay?\r\n\r\n\r\n-- solved --\r\nMaybe I could wrote about `BPF_HASH_OF_MAPS` macro. But `.cc` files have errors. I've never write c++ programs, Can anyone help me?\r\n```Bash\r\nIn file included from /home/*/bcc/tests/cc/test_map_in_map.cc:21:\r\nIn file included from /home/*/bcc/src/cc/api/BPF.h:25:\r\n/home/*/bcc/src/cc/api/BPFTable.h:487:15: error: function 'ebpf::BPFMapInMapTable<custom_key>::update_value' is used but not defined in this translation unit, and cannot be defined in any other translation unit because its type does not have linkage\r\n StatusTuple update_value(const KeyType& key, const int& inner_map_fd);\r\n ^\r\n/home/*/bcc/tests/cc/test_map_in_map.cc:182:13: note: used here\r\n res = t.update_value(hash_key, ex1_fd);\r\n```\r\n\r\n\r\nThis is probably due to the fact that the definition and implementation are in separate files, but if I write it in the header file, the following error occurs. I don't know which one is closer to the solution, so I pushed the one where the definition and implementation are in separate files.\r\n\r\n```Bash\r\nIn file included from /home/*/bcc/tests/cc/test_map_in_map.cc:21:\r\nIn file included from /home/*/bcc/src/cc/api/BPF.h:25:\r\n/home/*/bcc/src/cc/api/BPFTable.h:499:23: error: const_cast from 'char *(*)(const char *, int) throw()' to 'custom_key *' is not allowed\r\n if (!this->remove(const_cast<KeyType*>(&index)))\r\n```ghprbCommentBodynullghprbGhRepositoryiovisor/bccghprbCredentialsId6d3daf13-69b8-48b1-9c8f-ec5353264113false<a title="Allow the use of custom keys in BPF_HASH_OF_MAPS" href="https://github.com/iovisor/bcc/pull/3500">PR #3500</a>: Allow the use of custom key...#104812194377460664bcc-pr #10481048false10488386SUCCESS1624336635740https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/1048/git1048https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=fc25/1048/1048https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=fc26/1048/1048https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=fc27/1048/1048https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=fc28/1048/1048https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=ubuntu1604/1048/1048https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=ubuntu1710/1048/1048https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=ubuntu1804/1048/