queue.h | Samples on using the Unix API for simple data structures

The constructor (or rather its author) does not trust the incoming collection. The collection’s toArray method could violate the contract and return a shared array rather than creating a new one. This way, the caller could get hands on the internally used array of the constructed PriorityQueue instance.

So, the constructor makes another defensive copy, except when the incoming collection is an ArrayList exactly, i.e. not even a subclass of it. In other words, it trusts the ArrayList’s toArray implementation to adhere to the contract, to skip the additional copying step in this specific case. That’s why not even a subclass of ArrayList will be accepted, as a subclass could have overridden the toArray method.

A similar mistrust has been displayed in the default implementation of Stream.toList() as discussed in this question and the comment section beneath that question.

The default implementation has been specified as

As per the man page https://man7.org/linux/man-pages/man3/mq_open.3.html you need to

Link with -lrt.

ie

It turns out the problem was that in the Gemfile.lock file, it was locked to using an older version of bundler. We simply deleted the Gemfile.lock, and re-ran bundle to regenerate Gemfile.lock. That solved it. It now says this at the bottom of the Gemfile.lock file, so it liked this version of bundler:

You're using a vector instead of using a vector for distance. You need to use vector so that the elements are stored as float as shown below:

Your recipes are cluttered with files that don't belong there. Given the very limited amount of information you've provided, the most direct solution is to just slam out the recipes directly.

Your message types are wrong. When setting up the subscriber you're giving it a type of sdr_ros::TravelInfo, however the callback definition takes in sdr_ros::TravelInfoConstPtr as a parameter. Instead in your callback you want the ConstPtr generated by the message so change the signature to

The way is to use the timed interfaces:

If Queue.h includes LinkedList.h, all tanslation units including Queue.h need access to LinkedList.h or they won't compile. (Ignoring preprocessor shenanigans here.) If you cannot get rid of the include you cannot accomplish your goal.

Depending on the uses of the contents of LinkedList.h, you may be able to remove the include:

• If you're using only references or pointers to types defined in LinkedList.h, you could get away with adding forward declarations to those types to LinkedList.h
• If you're currently using types from LinkedList.h in ways other than reference or pointer, the pimpl idiom may allow you to get rid of this kind of usage.

If this is not an option, you may "hide away" those headers in a subdirectory with a name that indicated the headers are not meant to be included directly. I've seen private and impl being used.

Example:

When use std::priority_queue::top() it doesn't check if size() > 0, so std::priority_queue::top() use dealocated memory to use shared_ptr methods on, so cause bad things