[gdal-dev] Best vector driver?

Kurt Schwehr schwehr at gmail.com
Thu Feb 16 07:10:14 PST 2017


I have been meaning to write up a new RFC for the switch to C++11 as a
minimum in January and then the flu caught up with me.  I will try to do
that in the next week or two.   And I really appreciate all folks who
commented on that thread.

In my opinion, RFC 8 could use a lot of things and I only got through 2
documents that could feed into it last year (if I remember correctly).  One
of which was about getting large buffers off of the stack (
http://goo.gl/vuA3D6).  The other was a start on int bFoo -> bool bFoo (

Things that I think should be discussed/added off the top of my head in no
particular order and only things before C++11.  And I just overwhelmed

- When to use bool/true/false versus int/TRUE/FALSE/-1(MAYBE/UNKNOWN?).
Expand on https://goo.gl/hdzhXD
- namespaces
- Initializing vars and data members.  ctor initializer lists
- Don't use goto
- Templates and inlining
- Defining one member per line
- clang-format
- C++ casting
- CPLString versus std::string
- Preferring const var to #define
- Making vars const when possible
- override, explicit, CPL_DISALLOW_COPY_ASSIGN
- Design for testability and what tests to have.  e.g. I am working on an
in depth test of jp2kakdataset.cpp.
- static and dynamic analysis.  cppcheck, clang static analyzier, compiler
warnings.  How and when to tell the tools that they are being dumb
- Examples of good/helpful comments
- What to do about svn keywords and file permissions (e.g. python tests and
shellscripts being executable)
- When to use parens
- Prefer !.empty() and .empty().  When to use CPL_ARRAYSIZE
- Don't convert back to C strings for operations that are available in a
C++ string you already have
- ABS/MIN/MAX -> std::abs/std::min/std::max etc.
- When to use {} in if else (at least be consistent within a block)
- When to use a scope
- char *foo v. char foo[]
- When is it okay to have newlines in CPLDebug and CPLError
- When to use #if DEBUG_VERBOSE.  Is it okay to check in commented out code?

After C++11:

- Avoid bare .*alloc/new and *free/delete
- NULL -> nullptr
- constexpr / static_assert
- std::initializer_list

On Thu, Feb 16, 2017 at 1:16 AM, Mateusz Loskot <mateusz at loskot.net> wrote:

> On 15 February 2017 at 17:27, Kurt Schwehr <schwehr at gmail.com> wrote:
> >
> > Thanks for the pointers.  I will do touchups on the driver tutorial as I
> go.
> > [...]
> > What's the cleanest way to setup the driver registration?
> >
> > Should I be deriving from GDALDataset?
> Kurt,
> BTW, I'd have similar or related question.
> Which driver or part of the code is the latest/greatest in
> terms of the new C++ programming guidelines to look up to
> while writing new code for GDAL?
> Has there been any agreement on the overall C++ coding guidelines?
> Better, do we need the RFC8 [1] update?
> [1] https://trac.osgeo.org/gdal/wiki/rfc8_devguide
> Best regards
> --
> Mateusz Loskot, http://mateusz.loskot.net

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