mayhem | The Python | Reactive Programming library

sqrt n requires n to be of a type that is a member of the Floating typeclass, since sqrt has type sqrt :: Floating a => a -> a. There are no builtin numerical types that are both a member of the Integral and Floating typeclass: that would not make much sense since the two deal with different sorts of numbers.

You can use fromIntegral :: (Integral a, Num b) => a -> b to convert a number of any Integral type to any Num type. We thus can use this with:

How is this possible?

On Linux (and other UNIX) loading two different versions of openssl (or any other shared library) is unsafe and will almost always lead to bugs or crashes.

This is because (by design) UNIX shared libraries are not isolated from each other (unlike Windows DLLs). The first library to define any given symbol "wins", and all uses of that symbol will use the first definition, even when subsequent library also defines that symbol.

The best approach is to use a single version of openssl.

You might be able to use two incompatible libraries in a single process using dlmopen (which is Linux/GLIBC-specific), but you should be prepared to endure a lot of pain if you choose that route.

update your css code with this changes:

First: To reiterate points from comments:

• If you need that to be thread-safe, you'd need to make both calls "atomic" to your clients.
• I'd enclose GetLastError with another try/catch just to be safe.

This depends on much you want to hide the 3rd party from the clients of your adapter. If they shouldn't be aware (at least while using your adapter, of course, they would probably know there is a 3rd party) of the 3rd party, then you would need to hide the original Enum.

This could be done by making your own "copy" of that Enum. This is possible, but it has serious pitfalls: On each update of the 3rd party, you'd need to check if the enum has changed and change your code accordingly. Which could lead to breaking changes, even.

What I have done in the past is just using and exposing the integer value and providing a ErrorCodeToString function that basically casts the int to the 3rd Party enum and then does a ToString. That was enough for my purposes, but of course I don't claim that to be the or even a "best practice".

Recap what we have:

• Functions can have return codes of
  • 0 == "ok"
  • >0 (only some of them) == some integer valued result.
  • <0 , where ...
    • '-1' is a common error shared by all functions
    • '-2' and smaller are function-specific errors (different meaning per function)
• On top of negative returnCodes, an errorCode (=> enum) can be retrieved by calling GetLastError.

Now, one question would be: Is maintaining an exhausting table of all function-specific returncodes beneficial in addition to just having the ErrorCodeEnum value?

If yes: Things get a little more complicated. But maybe we can set this aside for now and focus on the Enum values.

Of course, you wouldn't want to write a custom handling for each and every function. So, what you want is some kind of Exception-Factory.

My assumptions regarding this are:

• You probably want to assign each enum value a different exception message.
• You've already shown a custom MyException type, so you'll probably want to use that.

Now, you need to make a design decision. You can use one exception type and have it have properties. Or you can derive "child" types from your base exception type.

The latter would make it convenient to group or single out exceptions you want/need to handle versus others you (or the client) want to just "bubble up".

Either way, you'll want to have a an interface like

my observations. Your error is probably not to do with Combine.

you are trying to decode "[FilmModel].self", but the response is only for one film, FilmModel.self.

Also I would make most/all var in your FilmModel etc... optional, add "?". It works well in my test.

EDIT:

This is the code I use to test my answer. Works well for me:

The problem is in the update method. The method has to change the coordinates of the rect attribute. However, your method continuously sets self.rect.x = 0 and self.rect.y = 0.
Change update:

I was on the right track with CreateConsoleScreenBuffer and giving each thread its own console screen buffer.
The problem was ReadConsole which doesn't do what I expected.
I now got it working with ReadConsoleOutput.

It should be noted however, that this method is the legacy way of doing it. If you want to do it the "new way" you should probably use Pseudo Console Sessions.
Its support starts with Windows 10 1809 and Windows Server 2019.

It should also be noted, that the method of reading the output of a process/program via console screen buffer has its flaws and two distinct disadvantages compared to anonymous pipes:

1. The console screen buffer can't get full and block the process/program, but if the end of it is reached, new lines will push the current first line out of the buffer.
2. Output from processes/programs that spam their std output in a fast fashion will most likely lead to loss of information, as you won't be able to read, clear and move the cursor in the console screen buffer fast enough.

I try to circumvent both by increasing the console screen buffers y size component to its maximum possible size (I found it to be MAXSHORT - 1) and just wait until the process/program has finished.
That's good enough for me, as I don't need to analyze or process the colored output, but just display it in a console window, which is itself limited to MAXSHORT - 1 lines.
In every other scenario I will be using pipes and advise everyone else to do so too!

Here is a short version without any error handling that can be executed in parallel without interference (provided the TStream object is owned by the thread or thread-safe):

You need to say (use-package :iterate) before you try to refer to unqualified symbols from the iterate package.

What has happened in your case is this.

1. You've loaded the iterate system into the running Lisp, creating a package called "ITERATE".
2. In the "CL-USER" package you've typed (iterate ...), and the reader has worked out that it needs to find or create a symbol whose name is "ITERATE" and which is accessible in the "CL-USER" package.
3. There is no such symbol, so it creates a new one, CL-USER::ITERATE.
4. This is not ITERATE:ITERATE so you get an error from the evaluator as it's trying to evaluate the arguments to a function (which doesn't exist, but it doesn't know that yet). In fact the error you're getting is while it's evaluating the first argument in the (for i ...) subform.
5. Now you say (use-package :iterate) to tell the system to add the "ITERATE" package to "CL-USER"'s search list.
6. Now there's a conflict: should iterate refer to the existing CL-USER::ITERATE or the newly-accessible ITERATE::ITERATE? (And there are some other conflicts too, probably).
7. So the system signals an error, and there should be some useful ways to proceed from that, one of which is probably 'unintern all the conflicting "CL-USER" symbols', but you didn't take that option, I suppose.
8. So now everything is messed up.

And the answer is: use the packages you want to refer to unqualified symbols from before you try to refer to those symbols unqualified.

(Also: Windows XP? I'm impressed by your retroness.)

An efficient way would be: