w | A simple C++ web framework based on Libevent | HTTP library
kandi X-RAY | w Summary
kandi X-RAY | w Summary
Did your dad ever tell you: "Writing web apps in C++ is dangerous and stupid! You should know better!"?.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of w
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Lines of Code : 21
License : No License
Copyvar express = require('express')
var cors = require('cors')
var app = express()
var corsOptions = {
origin: function (origin, callback) {
// db.loadOrigins is an example call to load
// a list of origins from a backing database
db.load def derivative_w2(Z, T, Y):
N, K = T.shape
M = Z.shape[1] # H is (N, M)
# # slow
# ret1 = np.zeros((M, K))
# for n in xrange(N):
# for m in xrange(M):
# for k in xrange(K):
# ret1[m,k] += (T[n, def derivative_w1(X, Z, T, Y, W2):
N, D = X.shape
M, K = W2.shape
# slow way first
# ret1 = np.zeros((X.shape[1], M))
# for n in xrange(N):
# for k in xrange(K):
# for m in xrange(M):
# for d i def nearest_neighbors(w, n=5):
if w not in word2vec:
print("%s not in dictionary:" % w)
return
v = word2vec[w]
distances = pairwise_distances(v.reshape(1, D), embedding, metric=metric).reshape(V)
idxs = distances.argsort()[1:n+1]
p Community Discussions
Trending Discussions on w
QUESTION
I was reading this code (source):
...ANSWER
Answered 2021-Jun-16 at 02:16The n2 - n1 in the case of a negative number as a result when converted to bool will yield true. So n1 turns out to be less than n2. That's why it is a bad practice to use ints in such Boolean context.
Yes, as stated in the documentation:
...comparison function object which returns true if the first argument is less than the second
But the implementation of the comparison here leads to failure. Try this and see for yourself:
QUESTION
ANSWER
Answered 2021-Jun-16 at 01:11The problem is that your CSS selectors include parentheses () and dollar signs $. These symbols already have a special meaning. See:
You can escape these characters using a backslash \.
QUESTION
Giving a bit of context. I'm using c++17. I'm using pointer T* data because this will interop with cuda code. I'm trying write a parallel version (on CPU) of a histogram creator. The sequential version:
ANSWER
Answered 2021-Jun-16 at 00:46The issue you are having has nothing to do with templates. You cannot invoke std::async() on a member function without binding it to an instance. Wrapping the call in a lambda does the trick.
Here's an example:
QUESTION
I have this array with addresses and countries associated to each address.
So Im trying to get the createdAt value from address where the country name is USA
How can I return exactly this ('1623775723413')
...ANSWER
Answered 2021-Jun-15 at 21:53You have to use find method from Array prototype - it will return first matching element, or undefined if no matching elements are present:
QUESTION
There is a function given as follows
...ANSWER
Answered 2021-Jun-15 at 21:34Your code doesn’t attempt to not fail if w isn’t a key in id2word, so it shouldn’t be too much of a surprise when it does fail. You could try changing
QUESTION
In C++20, we got the capability to sleep on atomic variables, waiting for their value to change.
We do so by using the std::atomic::wait method.
Unfortunately, while wait has been standardized, wait_for and wait_until are not. Meaning that we cannot sleep on an atomic variable with a timeout.
Sleeping on an atomic variable is anyway implemented behind the scenes with WaitOnAddress on Windows and the futex system call on Linux.
Working around the above problem (no way to sleep on an atomic variable with a timeout), I could pass the memory address of an std::atomic to WaitOnAddress on Windows and it will (kinda) work with no UB, as the function gets void* as a parameter, and it's valid to cast std::atomic to void*
On Linux, it is unclear whether it's ok to mix std::atomic with futex. futex gets either a uint32_t* or a int32_t* (depending which manual you read), and casting std::atomic to u/int* is UB. On the other hand, the manual says
The uaddr argument points to the futex word. On all platforms, futexes are four-byte integers that must be aligned on a four- byte boundary. The operation to perform on the futex is specified in the futex_op argument; val is a value whose meaning and purpose depends on futex_op.
Hinting that alignas(4) std::atomic should work, and it doesn't matter which integer type is it is as long as the type has the size of 4 bytes and the alignment of 4.
Also, I have seen many places where this trick of combining atomics and futexes is implemented, including boost and TBB.
So what is the best way to sleep on an atomic variable with a timeout in a non UB way? Do we have to implement our own atomic class with OS primitives to achieve it correctly?
(Solutions like mixing atomics and condition variables exist, but sub-optimal)
...ANSWER
Answered 2021-Jun-15 at 20:48You shouldn't necessarily have to implement a full custom atomic API, it should actually be safe to simply pull out a pointer to the underlying data from the atomic and pass it to the system.
Since std::atomic does not offer some equivalent of native_handle like other synchronization primitives offer, you're going to be stuck doing some implementation-specific hacks to try to get it to interface with the native API.
For the most part, it's reasonably safe to assume that first member of these types in implementations will be the same as the T type -- at least for integral values [1]. This is an assurance that will make it possible to extract out this value.
... and casting
std::atomictou/int*is UB
This isn't actually the case.
std::atomic is guaranteed by the standard to be Standard-Layout Type. One helpful but often esoteric properties of standard layout types is that it is safe to reinterpret_cast a T to a value or reference of the first sub-object (e.g. the first member of the std::atomic).
As long as we can guarantee that the std::atomic contains only the u/int as a member (or at least, as its first member), then it's completely safe to extract out the type in this manner:
QUESTION
entry = [["D 300"],["D 300"],["W 200"],["D 100"]]
def bankbalance(entry):
deposits = [float(entry[ent][0][2:]) for ent in entry if ("D" in entry[ent][0])]
withdrawals = [float(entry[ent][0][2:]) for ent in entry if ("W" in entry[ent][0])]
global balance
balance = sum(deposits) - sum(withdrawals)
bankbalance(entry)
Print(f'Current balance is {balance}')
ANSWER
Answered 2021-Jun-15 at 11:02ent is not the index, it is an element of entry, so you don't need entry[ent][0][2:], what you need is ent[0][2:].
Fixed code:
QUESTION
[Edit: apparently this file looks similar to h5 format] I am trying to extract metadata from a file with extension of (.dm3) using hyperspy in Python, I am able to get all the data but it's getting saved in a treeview, but I need the data in Json I tried to make my own parser to convert it which worked for most cases but then failed:
Is there a library or package I can use to convert the treeview to JSON in pyhton?
My parser:
...ANSWER
Answered 2021-Jun-15 at 20:08I wrote a parser for the tree-view format:
QUESTION
I have two select form with submit button, I need to get the result of selected value for example
first select form having colours as an option and second contains another things.
and i have some items as div....red flower , red fish.
if i select red from first form its shows red value div and in second form if i select flower it should display red flower only but it's shows everything under the value red. And these all thing must work only when i submit the search button. I have attached jsfiddle below. Code:
...ANSWER
Answered 2021-Jun-15 at 19:59This is not so simple as I initially thought
QUESTION
Sorry I don't show my variables or anything, tried to give information only pertaining to the questions. This 1 Sub is huge.
Currently my code allows a user to select multiple files, the files selected will be sorted in a specific format, then loaded into 2 different arrays. Currently loads Columns D:E into 1 array and Columns I:K into another array (from selected files QSResultFileWS, and returns those arrays to my destination FormattingWS. I'm still trying to learn arrays so if the methodology I used to do this isn't proper, be gentle.
ANSWER
Answered 2021-Jun-14 at 23:12You can use the FILTER function to remove the blanks.
Replace you lines load the arrays
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install w
git clone https://github.com/simonask/w.git --recursive — the recursive bit is important, because Wayward has a couple of dependencies.
cd w
scons -j8
cd examples/blog
scons -j8
createuser wayward_examples
createdb wayward_examples_blog -O wayward_examples
psql -d wayward_examples_blog < structure.sql
../../w_dev server blog
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