iterators | Share Market Prediction App using Markov Chains Model | Business library

I am trying to create my first project movie repository using Spring Boot + RestAPI + JPA + CrudRepository +MySQL.I am getting huge stack trace which is very difficult to understand.

Entity class:

I have a simple for loop in c++

I have below code where trying to use chainedIterator(Collection> iterators) from org.apache.commons.collections4.IteratorUtils (Apache commons collection4 lib) but giving compile time error.

Here is my code..

I'm trying to read a vector in the reverse order using a ranges::subrange view but I'm confused about how it should work. I'm aware of ranges::reverse but I'm trying to avoid using this method as a personal preference and learning experience.

My non-working example code is here:

I would like to know if it is possible to access the elements of std::vector> via iterators: I cannot understand why this won't compile:

I've been reading the Rust doc, and I finished chapter 13. I updated the minigrep program to use iterators in the Config struct. Now I am trying to re-implement the command line argument using iterators.

What I am trying to do is parse command-line arguments using iterators. Project code:

I need a container that meets this scenario:

1. Needs to be a member of a class
2. Needs to contain pointers to a custom type
3. The elements are sorted using a non-unique priority value (an integer. for example: priority 0 items go before priority 1 items, before priority 2 items. Order between items of the same priority is non-important)
4. Cannot use boost or any other external library

Optionally , it would be really good if I don't have to create an additional class/struct to support sorting. Also, up to C++17 is good.

Note, I am using (auto item : collection), but if this only works with traditional iterators, that is also fine.

So for example:

The following does not behave as i would like it too, as the destructor of Foo is called before the range-based for loop enters the body making the iterators invalid (msvc 2019).

Is there a way to "capture" the Foo object within without changing the syntax in the following code? I have seen the c++20 initializer part of the for loop, but if there is an alternative solution which does not need it, that would be preferred.

When doing rustlings standard_library_types/iterators2.rs, I started wondering how std::iter::Iterator::map calls its argument closure/function. More specifically, suppose I have a function