Re: Review Request 34193: Refactored common functionality into BaseFlags

[Marco Massenzio <ma...@mesosphere.io>]

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https://reviews.apache.org/r/34193/
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(Updated May 18, 2015, 5:26 p.m.)


Review request for mesos, Benjamin Hindman and Joris Van Remoortere.


Repository: mesos


Description
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Jira: MESOS-2711

Every program that uses stout's `BaseFlags` ends up
re-implementing the `printUsage()` function, and adding
a `bool help` (and associated --help flag); this functionality
has now been refactored in the base class and is available everywhere.

This change attempts to be backward-compatible, so it
does not alter the behavior of the program when --help is
invoked (by, eg, automatically printing usage and exiting)
but leaves up to the caller to check for `flags.help` and then
decide what action to take.

There is now a default behavior for the "leader" ("Usage: <prog name> [options]")
but the client API allows to modify that too.

Note - anywhere I found the use of the `--help` flag the behavior was the same: 
print usage and exit (see also https://reviews.apache.org/r/34195).


Diffs (updated)
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  3rdparty/libprocess/3rdparty/stout/include/stout/flags/flags.hpp fb383b463a99924483634eebf22bf34de318f920 
  3rdparty/libprocess/3rdparty/stout/tests/flags_tests.cpp 00281195b53d2597bdb46e3fe6cd9d46a5e9b1f1 

Diff: https://reviews.apache.org/r/34193/diff/


Testing
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make check

**NOTE** this change by itself breaks the build, because the --help is redefined everywhere (16 places, as of last count): CL 34195 fixes that and makes all build/tests pass.


Thanks,

Marco Massenzio