feels | Calculate apparent temperature using heat index
kandi X-RAY | feels Summary
kandi X-RAY | feels Summary
:cyclone: Calculate apparent temperature using heat index, approximate wet-bulb globe temperature, humidex, australian apparent temperature and wind chill.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
- Calculate the apparent complex temperature .
feels Key Features
feels Examples and Code Snippets
Community Discussions
Trending Discussions on feels
QUESTION
Motivating background info: I maintain a C++ library, and I spent way too much time this weekend tracking down a mysterious memory-corruption problem in an application that links to this library. The problem eventually turned out to be caused by the fact that the C++ library was built with a particular -DBLAH_BLAH
compiler-flag, while the application's code was being compiled without that -DBLAH_BLAH
flag, and that led to the library-code and the application-code interpreting the classes declared in the library's header-files differently in terms of data-layout. That is: sizeof(ThisOneParticularClass)
would return a different value when invoked from a .cpp file in the application than it would when invoked from a .cpp file in the library.
So far, so unfortunate -- I have addressed the immediate problem by making sure that the library and application are both built using the same preprocessor-flags, and I also modified the library so that the presence or absence of the -DBLAH_BLAH
flag won't affect the sizeof()
its exported classes... but I feel like that wasn't really enough to address the more general problem of a library being compiled with different preprocessor-flags than the application that uses that library. Ideally I'd like to find a mechanism that would catch that sort of problem at compile-time, rather than allowing it to silently invoke undefined behavior at runtime. Is there a good technique for doing that? (All I can think of is to auto-generate a header file with #ifdef/#ifndef
tests for the application code to #include
, that would deliberately #error
out if the necessary #define
s aren't set, or perhaps would automatically-set the appropriate #define
s right there... but that feels a lot like reinventing automake
and similar, which seems like potentially opening a big can of worms)
ANSWER
Answered 2022-Apr-04 at 16:07One way of implementing such a check is to provide definition/declaration pairs for global variables that change, according to whether or not particular macros/tokens are defined. Doing so will cause a linker error if a declaration in a header, when included by a client source, does not match that used when building the library.
As a brief illustration, consider the following section, to be added to the "MyLibrary.h" header file (included both when building the library and when using it):
QUESTION
Now that type parameters are available on golang/go:master
, I decided to give it a try. It seems that I'm running into a limitation I could not find in the Type Parameters Proposal. (Or I must have missed it).
I want to write a function which returns a slice of values of a generic type with the constraint of an interface type. If the passed type is an implementation with a pointer receiver, how can we instantiate it?
...ANSWER
Answered 2021-Oct-15 at 01:50Edit: see blackgreen's answer, which I also found later on my own while scanning through the same documentation they linked. I was going to edit this answer to update based on that, but now I don't have to. :-)
There is probably a better way—this one seems a bit clumsy—but I was able to work around this with reflect
:
QUESTION
I'm pretty new to Swift, currently writing an AR game. Seems like my issue is very basic, but I can't figure it out.
I added a button to an AR Scene through the storyboard and linked it to an IBAction function (which works correctly when the button is clicked). I gave the button an image and deleted the Title. See how the button shows up in the storyboard: button in Xcode storyboard without Title
But when I run the app, the button image shows up with a default label (saying "Button") as shown in this image: button in iPhone screenshot WITH label next to the button image
I can't figure out why this label is there and how to remove it. Should I add the button programmatically instead of adding it through the storyboard? Should the button be treated differently because it's an AR app?
I was able to remove the label by adding the same UIButton as an IBOutlet and adding the following line in viewWillAppear:
...ANSWER
Answered 2021-Nov-23 at 21:07When Interface Builder isn't playing nice, I often open the Storyboard file in a text editor (I use Sublime Text) and edit it manually.
I had a similar issue - I had a button with an image, I had deleted the default "Button" title text in IB, which looked fine in Xcode, but when I ran it, the word "Button" was still there. So I found this line using Sublime Text and deleted it there:
QUESTION
I'm trying to create a triangular grid with HTML and CSS which involves offsetting each successive triangle in the grid to the left by larger and larger amounts so that each triangle fits neatly next to the previous one. Since the amount that each triangle needs to move is based on it's index in the parent container, I'm currently using JS to set this offset. I'm looking for a way to do this with pure CSS. Using JS like this feels like a hack and I'm wondering if I'm missing something in CSS that would let me access each triangle div's index or perhaps there's another way altogether in CSS to achieve what I'm doing.
...ANSWER
Answered 2022-Mar-16 at 08:16I created the same result with a negative margin. So the triangles don't have to move an increasing space to the left.
QUESTION
While testing things around Compiler Explorer, I tried out the following overflow-free function for calculating average of 2 unsigned 32-bit integer:
...ANSWER
Answered 2022-Mar-08 at 10:00Clang does the same thing. Probably for compiler-construction and CPU architecture reasons:
Disentangling that logic into just a swap may allow better optimization in some cases; definitely something it makes sense for a compiler to do early so it can follow values through the swap.
Xor-swap is total garbage for swapping registers, the only advantage being that it doesn't need a temporary. But
xchg reg,reg
already does that better.
I'm not surprised that GCC's optimizer recognizes the xor-swap pattern and disentangles it to follow the original values. In general, this makes constant-propagation and value-range optimizations possible through swaps, especially for cases where the swap wasn't conditional on the values of the vars being swapped. This pattern-recognition probably happens soon after transforming the program logic to GIMPLE (SSA) representation, so at that point it will forget that the original source ever used an xor swap, and not think about emitting asm that way.
Hopefully sometimes that lets it then optimize down to only a single mov
, or two mov
s, depending on register allocation for the surrounding code (e.g. if one of the vars can move to a new register, instead of having to end up back in the original locations). And whether both variables are actually used later, or only one. Or if it can fully disentangle an unconditional swap, maybe no mov
instructions.
But worst case, three mov
instructions needing a temporary register is still better, unless it's running out of registers. I'd guess GCC is not smart enough to use xchg reg,reg
instead of spilling something else or saving/restoring another tmp reg, so there might be corner cases where this optimization actually hurts.
(Apparently GCC -Os
does have a peephole optimization to use xchg reg,reg
instead of 3x mov: PR 92549 was fixed for GCC10. It looks for that quite late, during RTL -> assembly. And yes, it works here: turning your xor-swap into an xchg: https://godbolt.org/z/zs969xh47)
with no memory reads, and the same number of instructions, I don't see any bad impacts and feels odd that it be changed. Clearly there is something I did not think through though, but what is it?
Instruction count is only a rough proxy for one of three things that are relevant for perf analysis: front-end uops, latency, and back-end execution ports. (And machine-code size in bytes: x86 machine-code instructions are variable-length.)
It's the same size in machine-code bytes, and same number of front-end uops, but the critical-path latency is worse: 3 cycles from input a
to output a
for xor-swap, and 2 from input b
to output a
, for example.
MOV-swap has at worst 1-cycle and 2-cycle latencies from inputs to outputs, or less with mov-elimination. (Which can also avoid using back-end execution ports, especially relevant for CPUs like IvyBridge and Tiger Lake with a front-end wider than the number of integer ALU ports. And Ice Lake, except Intel disabled mov-elimination on it as an erratum workaround; not sure if it's re-enabled for Tiger Lake or not.)
Also related:
- Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? - and those 3 uops can't benefit from mov-elimination. But on modern AMD
xchg reg,reg
is only 2 uops.
GCC's real missed optimization here (even with -O3
) is that tail-duplication results in about the same static code size, just a couple extra bytes since these are mostly 2-byte instructions. The big win is that the a
path then becomes the same length as the other, instead of twice as long to first do a swap and then run the same 3 uops for averaging.
update: GCC will do this for you with -ftracer
(https://godbolt.org/z/es7a3bEPv), optimizing away the swap. (That's only enabled manually or as part of -fprofile-use
, not at -O3
, so it's probably not a good idea to use all the time without PGO, potentially bloating machine code in cold functions / code-paths.)
Doing it manually in the source (Godbolt):
QUESTION
I'm wading through a codebase full of code like this:
...ANSWER
Answered 2022-Feb-25 at 15:31There's an unstable feature that will introduce let-else statements.
RFC 3137Introduce a new
let PATTERN: TYPE = EXPRESSION else DIVERGING_BLOCK;
construct (informally called a let-else statement), the counterpart of if-let expressions.If the pattern match from the assigned expression succeeds, its bindings are introduced into the surrounding scope. If it does not succeed, it must diverge (return
!
, e.g. return or break).
With this feature you'll be able to write:
QUESTION
I recently wrote
...ANSWER
Answered 2022-Jan-24 at 21:54You could perhaps do it like this:
QUESTION
Today I stumbled upon the following behaviour:
...ANSWER
Answered 2022-Jan-25 at 05:07Because derived classes do not necessarily support setattr
either.
QUESTION
Whenever I try to run
...ANSWER
Answered 2021-Nov-16 at 11:46Well, this is interesting. I did not think of searching for lsof
's COMMAND
column, before.
Turns out, ControlCe
means "Control Center" and beginning with Monterey, macOS does listen ports 5000
& 7000
on default.
- Go to System Preferences > Sharing
- Uncheck
AirPlay Receiver
. - Now, you should be able to restart
puma
as usual.
QUESTION
I am working with OSM data to create vector street maps. For the roads, I use line geometry provided by OSM and add a buffer to convert the line to geometry that looks like a road.
My question is related to geometry, not OSM, so I will use basic lines for simplicity.
...ANSWER
Answered 2021-Oct-16 at 14:36You can buffer the lines and then negative buffer that result:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install feels
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page