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(Updated Aug. 11, 2016, 8:24 p.m.) Review request for mesos, Alexander Rukletsov, Joris Van Remoortere, Michael Park, and Vinod Kone. Changes ------- Rebased. Bugs: MESOS-3335 https://issues.apache.org/jira/browse/MESOS-3335 Repository: mesos Description ------- While `FlagsBase` internally stores just maps of names and flags, the functions stored in a `Flag` rely on the original type of the `Flags` containing them (e.g., we perform dynamic casts to detect their types). Since `Option<T>` stores `T` as a value (i.e., it cannot contain reference types) any interface taking an `Option<T>` cannot rely on polymorphic behavior of `T`. To make use of polymorphism we should instead store e.g., a pointer type to avoid slicing. Here we change `Flags` arguments of `subprocess` to allow preserving the original type so `Flag` functions can work reliably; we do this by passing a non-owning pointer to a `Flags` so we do not restrict copying. Diffs (updated) ----- src/docker/docker.cpp e07c4aa723f57db7f8bc31d4af5d32a30ebf98f2 src/health-check/health_checker.cpp d43cb0568c120cbcec6a73d232396ccc54cf3e58 src/launcher/posix/executor.cpp 43573cacee4e681d4327a7ed7c43b4ee263aa175 src/linux/perf.cpp 9455210064779b59ad56637d846fe7584b21340f src/slave/container_loggers/lib_logrotate.cpp 1fca4864457388b265779fbca72296336f1aa5a9 src/slave/containerizer/docker.cpp 12bad2db03bcf755317c654f028b628c5c407a62 src/slave/containerizer/mesos/containerizer.cpp 86a8d8a85b6a33c87798108cb65af85bb9bbbc77 src/slave/containerizer/mesos/isolators/docker/volume/driver.cpp 842f2b5d4037e076cac4fd9c2eeb8f69786cffa7 src/slave/containerizer/mesos/isolators/network/cni/cni.cpp 760d32bf3dc09f3b715b378f5ded41556f15fe41 src/slave/containerizer/mesos/isolators/network/port_mapping.cpp 92f3c07e285ad3b8ef26692aa6475d755188b469 src/slave/containerizer/mesos/isolators/posix/disk.cpp f97ace9579879b35cb8050c56e968a31bb741c55 src/slave/containerizer/mesos/launcher.hpp bf435e3a9c150648336a1becf2f075fa183428bd src/slave/containerizer/mesos/launcher.cpp 9efe8474a2210957ce256fc08cb35694194213c3 src/slave/containerizer/mesos/linux_launcher.hpp c1852226c74bc611d045be721e284141e59adcd9 src/slave/containerizer/mesos/linux_launcher.cpp 95dee95c5e6e613e526c92d8729ae5583c8b58f1 src/tests/containerizer/isolator_tests.cpp 4f047ae6b2e85e177e8b73d60b9dfca913c832a5 src/tests/containerizer/launch_tests.cpp ef0c87c96e6a8379d119246a8ad044248522e67e src/tests/containerizer/launcher.hpp 7e5c243efad11d04e70b36876b2ed4db82666d31 src/tests/containerizer/mesos_containerizer_tests.cpp e3c8daab4fc688150a4f222e05f9b1bd9aee1912 src/tests/containerizer/ns_tests.cpp cd668ebb3b9461bee00dc338c288e5df6eb8fe31 src/tests/containerizer/port_mapping_tests.cpp fd181cae5540de1fdd631367aba5cce249f1b72c Diff: https://reviews.apache.org/r/46822/diff/ Testing ------- Tested on various platforms in internal CI. Thanks, Benjamin Bannier