Make C++ Config instances have default values in constructor

[lucasw]

This generates a header with an initializer list with all the default values, previously the defaults were loaded in only when the server ran.

This works now:

...
gen.add("str_param", str_t, 1, "string", "test")
...

#include <dynamic_reconfigure_example/ExampleConfig.h>
...
dynamic_reconfigure_example::ExampleConfig config;
ROS_INFO_STREAM(config.str_param);

For #33

(There isn't a corresponding class created for python (would that be useful?), the defaults can be accessed currently like this:

from dynamic_reconfigure_example.cfg import ExampleConfig
print ExampleConfig.defaults['str_param']

)

[mikaelarguedas]

Sorry @lucasw for the wait and thanks for the contribution!

The line number comments came in by default and I would rather not have them, how to get rid of them?

There doesn't seem to be an no option to disable them in dynamic_reconfigure ATM.

A unit test would be good but haven't looked into that.

👍 A unit test for this would be great

Haven't looked at why there is redundant code in parameter_generator_catkin.py and parameter_generator.py

parameter_generator.py was for rosbuild support and is now deprecated, it will be removed in a future ROS Distribution. I would recommend not modifying it in this PR and keep scope the changes to parameter_generator_catkin.py

There isn't a corresponding class created for python

Yeah it would make sense to have the symmetric in Python, though it shouldn't block the C++ version from moving forward as there is an easy way to get them

---

@ros-pull-request-builder retest this please

[rowandempster]

What's the status on this?

[lucasw]

Rebased this on noetic-devel, which causes the melodic build check to fail?

[sloretz]

Thank you for the PR!

Unfortunately I don't think we should merge this one.

ROS Noetic will reach end-of-life on May 31st, 2025. Every change comes with a risk of introducing regressions, and there isn't much time left to fix them. I'm closing pull requests that add features so that the remaining time is allocated towards bug fixes and compatibility with newer Ubuntu distros.