AndrewLipscomb

#include "./templates_a.h"

int main()
{
    LocalTypeA bbb;
    bbb.internal_ = new LocalTypeB();
    do_foo<LocalTypeA>(LocalTypeA());
    return 0;
}

AndrewLipscomb

#include "./templates_b.h"

#if defined(B_WITH_TAG)

template <>
auto do_foo(Tag<LocalTypeB>, LocalTypeB data)
{
    return do_foo<bool>(data.the_val);
}

AndrewLipscomb

#include "./templates_a.h"

// Compile `gcc main_a.cpp`

int main()
{
    do_foo<LocalTypeA>(LocalTypeA());
    return 0;
}

AndrewLipscomb

#include <string>
#include <type_traits>

template<typename T, typename R> 
R do_foo(T bb)
{
  static_assert(std::is_same<T, void>::value && false, "No use here");   
}

template<typename T, typename R>

AndrewLipscomb

Sending build context to Docker daemon  152.5MB
Step 1/15 : FROM ubuntu:18.04 as build-base
 ---> c3c304cb4f22
Step 2/15 : RUN apt-get update && apt-get install -y devscripts equivs
 ---> Running in d2b4cd630d2f
Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:2 http://archive.ubuntu.com/ubuntu bionic InRelease [242 kB]
Get:3 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages [933 kB]
Get:4 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:5 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]

AndrewLipscomb

How to set up static nspawn IP address networking without a bridge

Note - this article assumes you have reasonable familiarity with systemd, networkd and nspawn/machinectl

What is this guide for

There seem to be a lot of references on the internet for nspawn networking with a bridge - but not on simply using the stock veth networking with static addresses. The default behaviour of nspawn (as of 24/03/20 and systemd:245 on Arch) is to:

• Make a virtual ethernet port on the host (defined by /lib/systemd/network/80-container-ve.network)
• Make a virtual ethernet port in the container (defined by /lib/systemd/network/80-container-host0.network)
• Based on those configurations, serve the host port a random IP from the local network ranges with a 28 bit subnet, and a DHCP server for the host port serves a random IP in the subnet to the container

AndrewLipscomb

Getting a minimal Ubuntu 16.04 Xenial nspawn container running

Making this work requires a bit of extra effort to get it to a nice point.

Essentially we are aiming for a container that:

• Can be worked properly using machinectl
• Can be logged into without having to type passwords (obviously don't do this if you expose it publically)

This guide assumes you run your networking with systemd-networkd - if you don't, you will need to sort out container networking yourself. Check you aren't using network-manager with

AndrewLipscomb

Upon installation, make sure you have 
`dhclient iwd iwctl htop sudo`
for networking, perf and basic sandwich needs

Reboot and once back in normally, fix the keyboard to Norman

```

```

AndrewLipscomb

2019-04-11 14:21:42.525 BugTest[25240:2608649] +[NSValue valueWithMKCoordinate:]: unrecognized selector sent to class 0x7fff872763a8
2019-04-11 14:21:42.526 BugTest[25240:2608649] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[NSValue valueWithMKCoordinate:]: unrecognized selector sent to class 0x7fff872763a8'
*** First throw call stack:
(
	0   CoreFoundation                      0x00007fff2eeb0cf9 __exceptionPreprocess + 256
	1   libobjc.A.dylib                     0x00007fff59a44a17 objc_exception_throw + 48
	2   CoreFoundation                      0x00007fff2ef2aa56 __CFExceptionProem + 0
	3   CoreFoundation                      0x00007fff2ee530ef ___forwarding___ + 1485
	4   CoreFoundation                      0x00007fff2ee52a98 _CF_forwarding_prep_0 + 120
	5   libswiftCoreLocation.dylib          0x00007fff5ad61664 globalinit_33_25AD2332B1DC67E23B54508C4A7DAD45_func0 + 132

AndrewLipscomb

Wed 2019-04-10 10:38:38.133:  job_maintainer_node: Client sent list for:
Wed 2019-04-10 10:38:38.133:  job_maintainer_node:              /home/swarmbot/swarmbotCommon/PaddockDefinitions/BendeeWithRoads/GrassDownTheRoad/bendee_1_grass_down_the_road_1_of_1.txt
Wed 2019-04-10 10:38:38.133:  job_maintainer_node:              /home/swarmbot/swarmbotCommon/PaddockDefinitions/BendeeWithRoads/HousePaddock/bendee_1_house_paddock_1_of_4.txt
Wed 2019-04-10 10:38:38.133:  job_maintainer_node: While continuing /home/swarmbot/swarmbotCommon/PaddockDefinitions/BendeeWithRoads/Airstrip/demo_goals_airstrip_1_of_3.txt
Wed 2019-04-10 10:38:39.227:          events_node: Setting event DebugEvent:1 -> Time delay exceeded
Wed 2019-04-10 10:38:39.227:  job_maintainer_node: --- Saved an image of the generated path outside the polygon to /home/swarmbot/path_not_in_poly.svg for path of 7 points ---
Wed 2019-04-10 10:38:39.227:  job_maintainer_node: Exception in File: /home/swarmbot/swarmbot4/swarmbot_ws/src/job_maintainer/src/travel_jo