> On Nov. 7, 2016, 4:38 p.m., Qian Zhang wrote:
> > I do not quite understand the intention of this patch. The description of 
> > this patch says that `Previously, the headers did not contain includes for 
> > any of the classes used in the file.`, but actually `stout/os.hpp` has been 
> > already included which almost has all the needed headers, like 
> > `stout/nothing.hpp`, `stout/try.hpp`, etc. So I guess the intention of this 
> > patch is to remove the inclusion of `stout/os.hpp` and instead include each 
> > needed headers directly, right? But I still see `stout/os.hpp` in both 
> > `utils.hpp` and `utils.cpp` in this patch which makes me a bit confused.

The style for our include headers is to include all dependencies, so that 
changing the include headers of a dependency does not break any upstream code.

i.e. 
foo.hpp:
```
#include <string>

typedef std::string Fooo;
```

bar.hpp:
```
#include <map>
#include <string> // <- Need this because we use it in this file.

#include "foo.hpp"

std::map<Fooo, std::string> bar;
```

The exception is any headers that are effectively aliases to other headers, 
like `stout/lambda.hpp` (to various `<functional>` types) or 
`src/messages/messages.hpp` (to the protobuf `messages.pb.h`).


- Joseph


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On Nov. 7, 2016, 2:49 p.m., Joseph Wu wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/53556/
> -----------------------------------------------------------
> 
> (Updated Nov. 7, 2016, 2:49 p.m.)
> 
> 
> Review request for mesos, Benjamin Bannier, Jie Yu, and Qian Zhang.
> 
> 
> Bugs: MESOS-6360
>     https://issues.apache.org/jira/browse/MESOS-6360
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> This fixes the headers in the provisioner utility.  Previously, the
> headers did not contain includes for any of the classes used in the
> file.
> 
> 
> Diffs
> -----
> 
>   src/slave/containerizer/mesos/provisioner/utils.hpp 
> 4efce0ed67312417495af8c884ce26ef6affaccb 
>   src/slave/containerizer/mesos/provisioner/utils.cpp 
> 340cf48819679cdd8d08d76dcd2328234477a15f 
> 
> Diff: https://reviews.apache.org/r/53556/diff/
> 
> 
> Testing
> -------
> 
> make check (OSX)
> make check (CentOS 7)
> msbuild ... (Windows 10)
> 
> 
> Thanks,
> 
> Joseph Wu
> 
>

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