grumble | Alternative Mumble server | TCP library
kandi X-RAY | grumble Summary
kandi X-RAY | grumble Summary
Grumble is an implementation of a server for the Mumble voice chat system. It is an alternative to Murmur, the typical Mumble server.
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QUESTION
I am trying to get to grips with the specifics of the (C++20) standards requirements for container classes with a view to writing some container classes that are compatible with the standard library. To begin looking into this matter I have looked up the references for named requirements, specifically around container requirements, and have only found one general container requirement called Container given by the standard. Reading this requirement has given my two queries that I am unsure about and would like some clarification on:
The requirement for the expression
a == bfor two container typeChas as precondition on the element typeTthat it is equality comparable. However, noted later on the same page under the header 'other requirements' is the explicitly requirement thatTbe always equality comparable. Thus, on my reading the precondition for the aforementioned requirement is redundant and need not be given. Am I correct in this thinking, or is there something else at play here that I should take into account?I was surprised to see explicit requirements on
Tat all: notably the equality comparable requirement above and the named requirement destructible. Does this mean it is undefined behaviour to ever construct standard containers of types failing these requirements, or only to perform certain standard library function calls on them?
Apologies if these two questions sound asinine, I am currently trying to transition my C++ knowledge from a place of having a basic understanding of how to use features to a robust understanding so that I may write good generic code. Whilst I am trying to use (a draft of) the standard to look up behaviour where possible, its verbiage is oft too verbose for me to completely understand what is actually being said.
In an attempt to seek the answer I cooked up a a quick test .cpp file to try an compile, given below. All uncommented code compiles with MSVC compiler set to C++20. All commented code will not compile, and visa versa all uncommented code will. It seems that what one naively thinks should work does In particular:
- We cannot construct any object without a destructor, though the objects type is valid and can be used for other things (for example as a template parameter!)
- We cannot create an object of
vector, whereThas no destructor, even if we don't attempt to create any objectsT. Presumably because creating the destructor forvectortries to access a destructor forT. - We can create an object of type
vector,TwhereThas no operator==, so long as we do not try to use operator==, which would requireTto have operator==.
However, just because my compiler lets me make an object of vector where T is not equality-comparable does not mean I have achieved standards compliant behaviour/ all of our behaviour is not undefined - which is what I want I concerned about, especially as at least some of the usual requirements on the container object have been violated.
Code:
...ANSWER
Answered 2021-Dec-30 at 04:32If the members of a container are not destructible, then the container could never do anything except add new elements (or replace existing elements). erase, resize and destruction all involve destroying elements. If you had a type T that was not destructible, and attempted to instantiate a vector (say), I would expect that it would fail to compile.
As for the duplicate requirements, I suspect that's just something that snuck in when the CppReference folks wrote that page. The container requirements in the standard mention (in the entry for a == b) that the elements must be equality comparable.
QUESTION
I have a C++ language/compiler design curiosity question. I'm using gcc 11.2.0, -std=gnu++17 on Cygwin.
Why is it an error to directly reference local variables in structures? Lambda functions do this all the time, and they are basically no different from structures containing the operator() method. As an example:
...ANSWER
Answered 2021-Nov-18 at 00:50All of the cases that work specifically involve you passing an expression to a constructor. Even the lambda version requires you to spell out the variables you intend to capture (or to use a default capture). This effectively counts as a way to specify the lambda's constructor (which is why you can't default construct capturing lambdas).
In C++, a local class is basically convenience notation. The local class declaration and the definitions within it are scoped as if it were defined just before the containing function's definition. As such, it has no access to any function-local names, including those of local variables.
QUESTION
As per book The C++ Programming Language, 4th Edition -
In C and in older C++ code, you could assign a string literal to a non-const char*:
...
ANSWER
Answered 2021-Nov-10 at 19:37The GCC compiler is somewhat permissive by default and allows some extension such as implicitly converting away the constness of a string.
Most likely this extension was added to keep compatibility with C.
To disable those extensions, simply add the --pedantic-errors flag that will make the compiler refuse invalid code.
QUESTION
in have 2 issues.
First, i tried to made a music bot for discord and it went good until i tried to play another song from it, to play another song (queue maybe?) i had to leave the bot from the voice channel and write the play command again (which is not what i wanted) and also tried to play from a music title and not only from url only (cause its a mess going to youtube and copy the link for every song i want to play) but it only works if i put the title between undescore (like "!play name_of_the_song") i tried a lot of things but none of them seems to work, so asking here is my last ham.
So what I want is to play the bot one song after another from the play command and that I can search for a song from its title without giving me another song that has nothing to do with what I am looking for
What does my code look like right now:
...ANSWER
Answered 2021-Sep-07 at 17:28you can make a queue for the guild to play music. Either using the builtin module queue, or just by using a list. Something like this would work:
QUESTION
I have a binary function which returns a Boolean indicating whether the first argument is strictly less than the second argument.
Can I use the sorted(my_list, key=functools.cmp_to_key(boolean_cmp)) or some variant thereof to sort this list? Or do I need to refactor the boolean_cmp function so that it returns a positive, negative, or zero integer?
Do I really need to distinguish between the greater-than case and the equal-to case?
The boolean_cmp function is written as a several methods spread out over the program. Refactoring them would be possible, but seems like more work than is necessary.
I've done a bit of experimentation and it looks like converting False to 0 and True to -1 causes sorted to sort correctly. But my experiment is only anecdotal.
BTW, I was reading Sorting HOW TO and it took me a long time to figure out that the underlying compare function needed an integer return value rather than a Boolean. In my opinion, it would have been nice if that had been clearer. [grumble]
...ANSWER
Answered 2021-Jun-24 at 13:43Rather than refactor a method you already have in use, I recommend that you wrap a lambda around it that will try to return the -1, 0, 1 that functools.cmp_to_key() is hoping for.
Maybe something like:
QUESTION
I endeavour to save my struct to user preferences. My code follows
...ANSWER
Answered 2021-Mar-26 at 15:04Check your cargo.lock. Most likely, your main application is pulling in a different version of serde than the preferences crate.
It appears that preferences depends on serde-0.9, but chances are you're pulling in serde-1.0. This means that your struct implements serde-1.0::Deserialize, but preferences wants serde-0.9::Deserialize.
The inability of the compiler to produce a nice message for this case is a long-standing bug.
QUESTION
I need to do actions when pressing the checkbox with Javascript. To practice, I used this code:
...ANSWER
Answered 2020-Dec-16 at 09:10Use a CDATA section to put the Javascript code into the XQuery, to prevent the {} from being seen as delimiters of enclosed expressions:
QUESTION
My Dockerfile looks something like this.
...ANSWER
Answered 2020-Mar-12 at 18:01when executing the first part of your query:
QUESTION
I have a dataframe with sentences; in some sentences, words get used more than once:
...ANSWER
Answered 2020-Mar-02 at 09:03An option for defining the exact amount of repeated words.
extract sentences in which the same words occur 3 times
change regex.
(\s?\b\w+\b\s)(.*\1){2}
(\s?\b\w+\b\s) captured by Group 1
- \s? : blank space occurs zero or once.
- \b\w+\b : the exact word character.
\s : blank space occurs once.
(.*\1) captured by Group 2
(.*\1) : any characters that occur zero or more times before Group 1 matches again.
(.*\1){2} : Group 2 matches twice.
Code
QUESTION
I have a page with a list of audio play files; the viewer clicks the link and this plays the corresponding audio file.
When a new link is clicked, all current audio needs to cease. Including that link, if it's already playing. So; each link is a start/stop for that audio file.
I have constructed a JQuery / JS script that should do this, but the scripts seems to have problems with the this declaration and with being dynamic.
The Audio Id is the same as the Text within the anchor link.
HTML:
...ANSWER
Answered 2020-Jan-21 at 16:30Indeed the innerHTML property (not method) does not exist for a jQuery object. You must call it on a DOM object (JS)
It's $("...").html() or $("...").get(0).innerHTML as the get method returns a pure JS DOM object.
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