Fixed style of example

[marcusmueller]

While it's certainly nice that C++ allows you to not have {} to
encapsulate a function body if that body only consists of a single
statement (here: try{…}), it is not of any familiarity to C++ coders
to omit them.

Same goes for putting main's argc/argv arguments on multiple lines.

Also, defining a macro PRIVATE_SOMETHING just to use it once one line of
code below is a bit of a strange thing to do.

So, I got rid of the macro and applied the clang-format style from
https://github.com/boost-experimental/vc

[CTMacUser]

I felt if everything was going to be try-ed, then there was no point implying a structure that would allow me to insert statements around the try block in the future.

And teaching the novices about function-whole try blocks is a good thing! (OK, I'm not teaching it, but making novices look it up in their C++ book, or on StackOverflow, is still good.)

[marcusmueller]

I beg to differ. This is an example meant to be easy to understand; it's not meant to teach C++ syntax that people seldom come across.

(I'd give my opinion about the quality of the idea of doing single statement body blocks without brackets, but I already did so.)

[marcusmueller]

Also, boost at least strives to have a common and (compared to omission of brackets in function bodies) sane style; that's why the aforementioned style file exists. I don't think individual examples should choose to diverge from that.