[TriEmbed] C++ class templates in Arduino - problems

[Robert Mackie]

Or just build a file to so that you are building under gcc/g++ and not
arduino. If you are looking for an example of how to do that, I just
recently noticed that Marlin (the firmware for a lot 3d printers including
reprap) has an example of how to do it. You can still build edit and build
from the arduino IDE but the build system doesn't play all the games, as
far as I can tell. (it adds special file that does something to make that
work) At least something like that is going on.

It has a Marlin.ino file that does NOT have the void setup() and void
loop() functions. Rather it has some #ifdef's and some #include's then
there is a file named "Marlin_main.cpp" that has the "void loop()" and the
"void setup()" and some other stuff in it. I don't see a lot of template
work, but g++ is g++ with respect to templates. Whatever they are doing
works some magic with how the files are organized so that it can be more
like a normal code layout, again - I *think*.

There are many git repos out there with variations of the Marlin source
tree if you want to look at it. google or github can find them.

Here's a comment I found in the Marlin.ino file

/* All the implementation is done in *.cpp files to get better
compatibility with avr-gcc without the Arduino IDE */
/* Use this file to help the Arduino IDE find which Arduino libraries are
needed and to keep documentation on GCode */

No, I don't know what I'm talking about with the Arduino IDE. I just keep
faking it to success.

Rob.

Rob.

On Tue, Apr 21, 2020 at 5:43 PM Jon Wolfe via TriEmbed <
triembed at triembed.org> wrote:

>
>
> Arduino uses gcc under the hood.
>
>
>
> The error about the “for” could be a red herring. GCC is full of those.
>
>
>
> Templates in C++ can be very sensitive to the proper declarations in place
> prior to a specialization of it.. The Arduino IDE plays games with how
> files are #included, which is one of the things I do not like about it, it
> makes things easier for beginners, at the expense on control for power
> users.
>
>
>
> You syntax looks correct. (as it ought to since it compiles in another
> environment). Try moving those lines around within the source file, or even
> putting them in a header files in an inline function, just short term, in
> an attempt to get a more clear error message.
>
>
>
>
>
> *From: *alex--- via TriEmbed <triembed at triembed.org>
> *Sent: *Tuesday, April 21, 2020 5:33 PM
> *To: *triembed at triembed.org
> *Subject: *[TriEmbed] C++ class templates in Arduino - problems
>
>
> Anyone familiar with class templates? Code which has no problems under
> clang-1100.0.33.16 appears to have trouble under whatever Arduino 1.8.9 is
> using as a compiler.
>
> Take these two lines as an example:
>
> Vec3<unsigned char> *frameBuffer = new Vec3<unsigned char>[imageWidth *
> imageHeight];
> for (uint32_t i = 0; i < imageWidth * imageHeight; ++i) frameBuffer[i] =
> Vec3<unsigned char>(255);
>
> On Arduino, it complains the ‘for’ on the second line was unexpected. The
> compiler must be doing something wrong with substituting code on line 1 and
> losing the ‘;’ perhaps. But why?
>
> For those with time:
> Arduino code is here:
> https://github.com/quarterturn/simple-wireframe
>
> Linux or OSX command line code is here:
> https://github.com/quarterturn/wireframe
>
> What the code does is render a 3D model as a wireframe, using surface
> normals for back surface culling, as well as a z-buffer for hidden line
> removal. On the Arduino, should I ever get it working, it will send a
> vector list to an Arduino Due, which will use it to draw the image on an
> oscilloscope in XY mode.
>
> I gotta get off Arduino. Only so many systicks in a day though.
>
> Alex
>
>
>
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