move | powerful programming language that runs on any ES3 | Interpreter library
kandi X-RAY | move Summary
kandi X-RAY | move Summary
Move is a simple but powerful programming language which can run on most computers (anywhere there's a >=ES3 JavaScript runtime). When compared to JavaScript, Move has the following key features:.
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Top functions reviewed by kandi - BETA
- Parses given text into tokens
- Generate an AST
- Squze the AST
- Parses a JavaScript source .
- Wrap AST walker .
- parse an expression .
- styled - friendly formatting function
- Parses given XML string into tokens
- generate a string from holder
- statement | statement
move Key Features
move Examples and Code Snippets
def moveaxis(a, source, destination): # pylint: disable=missing-docstring
"""Raises ValueError if source, destination not in (-ndim(a), ndim(a))."""
if not source and not destination:
return a
a = asarray(a)
if isinstance(source, int):
def has_atomic_move(path):
"""Checks whether the file system supports atomic moves.
Returns whether or not the file system of the given path supports the atomic
move operation for a file or folder. If atomic move is supported, it is
recomme
function getPossibleMoves(chessboard, position) {
// Generate all knight moves (even those that go beyond the board).
const possibleMoves = [
[position[0] - 1, position[1] - 2],
[position[0] - 2, position[1] - 1],
[position[0] + 1, po
Community Discussions
Trending Discussions on move
QUESTION
In react-router v5 i created history object like this:
...ANSWER
Answered 2021-Nov-17 at 07:20Well, it turns out you can duplicate the behavior if you implement a custom router that instantiates the history state in the same manner as RRDv6 routers.
Examine the BrowserRouter implementation for example:
QUESTION
In my version of clang and libc++ (near HEAD
), this static_assert
passes:
ANSWER
Answered 2022-Mar-26 at 23:21std::vector
and other containers (except std::array
) are specified to have a copy constructor. This is not specified to be conditional on whether or not the element type is copyable. Only instantiation of the copy constructor's definition is forbidden if the element type is not copyable.
As a result std::is_copy_constructible_v
on the container will always be true
. There is no way to test whether an instantiation of a definition would be well-formed with a type trait.
It would be possible to specify that the copy constructor is not declared or excluded from overload resolution if the element type is not copyable. However, that would come with a trade-off which is explained in detail in this blog post: https://quuxplusone.github.io/blog/2020/02/05/vector-is-copyable-except-when-its-not/.
In short, if we want to be able to use the container with an incomplete type, e.g. recursively like
QUESTION
Is it possible to perfectly forward *this
object inside member functions? If yes, then how can we do it? If no, then why not, and what alternatives do we have to achieve the same effect.
Please see the code snippet below to understand the question better.
...ANSWER
Answered 2022-Mar-04 at 17:44This is not possible in C++11 without overloading sum
for &
and &&
qualifiers. (In which case you can determine the value category from the qualifier of the particular overload.)
*this
is, just like the result of any indirection, a lvalue, and is also what an implicit member function call is called on.
This will be fixed in C++23 via introduction of an explicit object parameter for which usual forwarding can be applied: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p0847r7.html
QUESTION
I stumbled over the following piece of code. The "DerivedFoo"
case produces different results on MSVC than on clang or gcc. Namely, clang 13 and gcc 11.2 call the copy constructor of Foo
while MSVC v19.29 calls the templated constructor. I am using C++17.
Considering the non-derived case ("Foo"
) where all compilers agree to call the templated constructor, I think that this is a bug in clang and gcc and that MSVC is correct? Or am I interpreting things wrong and clang/gcc are correct? Can anyone shed some light on what might be going on?
Code (https://godbolt.org/z/bbjasrraj):
...ANSWER
Answered 2022-Feb-06 at 21:41It is correct that the constructor template is generally a better match for the constructor call with argument of type DerivedFoo&
or Foo&
than the copy constructors are, since it doesn't require a const
conversion.
However, [over.match.funcs.general]/8 essentially (almost) says, in more general wording, that an inherited constructor that would have the form of a move or copy constructor is excluded from overload resolution, even if it is instantiated from a constructor template. Therefore the template constructor will not be considered.
Therefore the implicit copy constructor of DerivedFoo
will be chosen by overload resolution for
QUESTION
When trying to build my project I am getting the following error:
Could not GET
'https://jcenter.bintray.com/androidx/lifecycle/lifecycle-common/maven-metadata.xml'.
Received status code 502 from server: Bad Gateway
- In my build.gradle repositories I don't have JCenter, so this error I'm getting is from dependencies that are still pointing to JCenter.
- Gradle offline mode is not the solution I'm expecting.
- I know that JCenter is down and that we should all move to Maven Central (I already did)
Is there a workaround?
...ANSWER
Answered 2022-Jan-30 at 23:31It's a global outage in JCenter. You can monitor status at https://status.gradle.com. It replaces the bintray status page which seems is now fully sunset and returns a 502 error.
UPDATE Jan 13, 06:35 UTC
JCenter is now back online, and systems are fully operational.
UPDATE Jan 20
Gradle Plugin resolution outage postmortem
https://blog.gradle.org/plugins-jcenter
Following this incident, the Gradle Plugin Portal now uses a JCenter mirror hosted by Gradle instead of JCenter directly. This should shield users from short JCenter outages for libraries that have been cached by the mirror. We saw another short outage of JCenter over the weekend and this did not appear to impact Gradle Plugin Portal users.
QUESTION
I made a bubble sort implementation in C, and was testing its performance when I noticed that the -O3
flag made it run even slower than no flags at all! Meanwhile -O2
was making it run a lot faster as expected.
Without optimisations:
...ANSWER
Answered 2021-Oct-27 at 19:53It looks like GCC's naïveté about store-forwarding stalls is hurting its auto-vectorization strategy here. See also Store forwarding by example for some practical benchmarks on Intel with hardware performance counters, and What are the costs of failed store-to-load forwarding on x86? Also Agner Fog's x86 optimization guides.
(gcc -O3
enables -ftree-vectorize
and a few other options not included by -O2
, e.g. if
-conversion to branchless cmov
, which is another way -O3
can hurt with data patterns GCC didn't expect. By comparison, Clang enables auto-vectorization even at -O2
, although some of its optimizations are still only on at -O3
.)
It's doing 64-bit loads (and branching to store or not) on pairs of ints. This means, if we swapped the last iteration, this load comes half from that store, half from fresh memory, so we get a store-forwarding stall after every swap. But bubble sort often has long chains of swapping every iteration as an element bubbles far, so this is really bad.
(Bubble sort is bad in general, especially if implemented naively without keeping the previous iteration's second element around in a register. It can be interesting to analyze the asm details of exactly why it sucks, so it is fair enough for wanting to try.)
Anyway, this is pretty clearly an anti-optimization you should report on GCC Bugzilla with the "missed-optimization" keyword. Scalar loads are cheap, and store-forwarding stalls are costly. (Can modern x86 implementations store-forward from more than one prior store? no, nor can microarchitectures other than in-order Atom efficiently load when it partially overlaps with one previous store, and partially from data that has to come from the L1d cache.)
Even better would be to keep buf[x+1]
in a register and use it as buf[x]
in the next iteration, avoiding a store and load. (Like good hand-written asm bubble sort examples, a few of which exist on Stack Overflow.)
If it wasn't for the store-forwarding stalls (which AFAIK GCC doesn't know about in its cost model), this strategy might be about break-even. SSE 4.1 for a branchless pmind
/ pmaxd
comparator might be interesting, but that would mean always storing and the C source doesn't do that.
If this strategy of double-width load had any merit, it would be better implemented with pure integer on a 64-bit machine like x86-64, where you can operate on just the low 32 bits with garbage (or valuable data) in the upper half. E.g.,
QUESTION
I have an java app (JDK13) running in a docker container. Recently I moved the app to JDK17 (OpenJDK17) and found a gradual increase of memory usage by docker container.
During investigation I found that the 'serviceability memory category' NMT grows constantly (15mb per an hour). I checked the page https://docs.oracle.com/en/java/javase/17/troubleshoot/diagnostic-tools.html#GUID-5EF7BB07-C903-4EBD-A9C2-EC0E44048D37 but this category is not mentioned there.
Could anyone explain what this serviceability category means and what can cause such gradual increase? Also there are some additional new memory categories comparing to JDK13. Maybe someone knows where I can read details about them.
Here is the result of command jcmd 1 VM.native_memory summary
ANSWER
Answered 2022-Jan-17 at 13:38Unfortunately (?), the easiest way to know for sure what those categories map to is to look at OpenJDK source code. The NMT tag you are looking for is mtServiceability. This would show that "serviceability" are basically diagnostic interfaces in JDK/JVM: JVMTI, heap dumps, etc.
But the same kind of thing is clear from observing that stack trace sample you are showing mentions ThreadStackTrace::dump_stack_at_safepoint
-- that is something that dumps the thread information, for example for jstack
, heap dump, etc. If you have a suspicion for the memory leak in that code, you might try to build a MCVE demonstrating it, and submitting the bug against OpenJDK, or showing it to a fellow OpenJDK developer. You probably know better what your application is doing to cause thread dumps, focus there.
That being said, I don't see any obvious memory leaks in StackFrameInfo
, neither can I reproduce any leak with stress tests, so maybe what you are seeing is "just" thread dumping over the larger and larger thread stacks. Or you capture it when thread dump is happening. Or... It is hard to say without the MCVE.
Update: After playing with MCVE, I realized that it reproduces with 17.0.1, but not with either mainline development JDK, or JDK 18 EA, or JDK 17.0.2 EA. I tested with 17.0.2 EA before, so was not seeing it, dang. Bisection between 17.0.1 and 17.0.2 EA shows it was fixed with JDK-8273902 backport. 17.0.2 releases this week, so the bug should disappear after you upgrade.
QUESTION
So I've recently learned about universal references and reference collapsing.
So let's say I have two different implementations of a max function like such.
...ANSWER
Answered 2022-Jan-16 at 18:47The first one should probably be:
QUESTION
Given the following code snippet:
...ANSWER
Answered 2022-Jan-10 at 16:12I think this is the open CWG issue 2077.
Basically,
QUESTION
In my Fedora 34 environment (g++), std::accumulate
is defined as:
ANSWER
Answered 2022-Jan-01 at 20:50The value category of init + *first
doesn't matter.
init
in init + *first
is a lvalue.
So if init + *first
calls an operator+
overload taking the parameter by-value, it will cause a copy construction of that parameter
But the value of init
is not required anymore after init + *first
, so it makes sense to move it into the parameter instead.
Similarly a operator+
overload taking its first argument by rvalue-reference might be used to allow modification of the argument by the operation.
This is what std::move
achieves here.
The standard specifies this behavior since C++20.
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