Tag: WebDev

I need to define several constant strings that will be used across an entire C++20 project. I am considering the following options : constexpr char[] str1 = "foo"; constexpr std::string str2 = "foo"; constexpr std::string_view str3 = "foo"; but I hesitate about which one I must choose. constexpr char[] is efficient but is not modern C++. constexpr std::string is modern C++ and takes advantage of the fact "since C++20 std::string is a constexpr class to perform operations at compile time" but even so, I heard it uses dynamic allocation anyway so it may not be the best option. constexpr std::string_view is probably the optimal choice but I have checked several resources including Professional C++ (5th Edition) by Marc Gregoire and I didn't find clear guidelines it was the reco

I need to load some data from the folder in which my Desktop\diodo_laser\grafici_diodo_laser.py file that I'm using is saved. I run my Python files with Pyzo IDE and I'm not running it as a script, rather I'm running it from the editor. Other topics on this (like Find path to currently running file or How to get the path and name of the Python file that is currently executing?) suggest using one amongst os.getcwd(), sys.argv[0], sys.path[0] or __file__, but neither of these get me where I want, because I'm neither running it as a script nor running it from the cmd terminal, so all of those commands result in C:\Users\myname or a blank string (and __fi

I have this code that works great except for when the end of the week comes up I have to change 8 to 15 or vise versa in order to get to the correct workbook. Is there another way? This code is to help find a workbook with the Title Sched and a date (i.e Sched 12.07.25). That workbook is usually created on Monday's or Tuesdays for future schedules (can be up to 2 weeks, usually 1 week). Once I get the schedule I have to put 15 (for more than 7 days from date of creation). Once that week has started and progresses, say now it in that week and is Saturday I have to change it from 15 to 8 to find less than 7 days). So I am working in 2 different workbooks at a time. 1- Schedule 11.30.25 and 2-Schedule 12.07.25. "dat" needs to know which sched to look for. Date always ends on a sunday. Option Explicit Function strgen() Dim dat As Variant Dim datstring As Variant dat = Date - Weekday(Now(), 1) + 15 ''Change 8(this wk) or 15(next wk) to find right wb dat

Since perhaps 3 weeks the YouTube player (WKYTPlayerView / ObjectivC) embedded in our app doesn't play films any more, instead it raises "Error 4".

I have a dataset that spans 1962 to 1981. The dates are formatted as a string in a single field like this: 15-Mar-62. When I use the as.Date function to convert the field into a date format (so I can later group by year), all dates before 1969 end up with a Y2K type error. Reproducible form: dfexample <- tibble::tibble( event = c(1:5), cause = c("human error", "environment", "environment", "human error", "environment"), date = c("13-Mar-62", "15-Dec-65", "19-Apr-69", "22-Jun-70", "07-Sep-81") ) dfexample$date <- as.Date(dfexample$date, "%d-%b-%y") show(dfexample) Output: # A tibble: 5 × 3 event cause date <int> <chr>

I have the following C code that I am testing to understand perf and caching. It sequentially accesses an array of doubles. // test.c #include <stdio.h> #include <stdlib.h> #include <emmintrin.h> int main(int argc, char **argv) { size_t n = 10000000; double* arr; if (posix_memalign((void**)&arr, 64, n * sizeof(double)) != 0) { fprintf(stderr, "posix_memalign failed\n"); exit(1); } for (size_t i = 0; i < n; i += 64) { _mm_clflush(&arr[i]); } for (size_t i = 0; i < n; i++) arr[i] = (double)i; double sum = 0; for (size_t i = 0; i < n; i++) sum += arr[i]; printf("Sum: %f\n", sum); free(arr); return 0; } I compile the code without optimization, and run perf. $ gcc -o test test.c $ perf stat -e LLC-loads,LLC-loads-misses -- ./test Sum: 4

public interface A<out T> { public T Property { get; } } public class BaseClass : A<string>, A<int> { string A<string>.Property => "BaseClass"; int A<int>.Property => 0; } public class DerivedClass : BaseClass, A<string>, A<int> { string A<string>.Property => "DerivedClass"; int A<int>.Property => 1; } [Fact] public async Task Test1() { var obj = new DerivedClass(); var values = obj.GetType().GetInterfaces().Where(i => i.GetGenericTypeDefinition() == typeof(A<>)).Select(i => i.GetProperty(nameof(A<>.Property))!.GetValue(obj)!); Assert.Equal(4, values.Count()); } With this dummy code values only holds ["DerivedClass",1]. Is it possible to get all 4 values (so including those of the base class), or are the base interface implementations completely ove

Suppose I have a unity build: //impl1.h //impl1.cpp -> #include s impl1.h //impl2.h //impl2.cpp -> #include s impl2.h AND impl1.h //main.cpp #include "impl1.cpp" #include "impl2.cpp" int main(){ //stuff } Does it matter that impl1.h is like so: #ifndef IMPL1_H #define IMPL1_H //impl1.h stuff #endif as opposed to #pragma once //impl1.h stuff The reason I ask is that the semantics of the header guard seem to me to make it absolutely certain that #include "impl2.cpp" does not again process impl1.h. With #pragma once, and assuming #include " " engages in more or less plain straightforward textual substitution, are there issues with the compiler seeing multiple #pragma onces corresponding to the same or different header files when it processes

I am writing a C application, to be distributed as a single static binary (so it doesn't have a chance to do anything like install message catalog files). It only needs to support a few natural languages; I want to get the "current language" the program is supposed to be speaking, and then print one thing if it is English, another if it is, say, Japanese, and a third if it is Polish, and maybe something else if it isn't any of those. I know that a C program starts up with the "C" locale. This is not the "correct" language for the program to speak in its output, based on the standard environment variables like LANG. To get the program to consult its environment and determine the correct locale for messages to the user, I need to do something like: char* message_locale = setlocale(LC_MESSAGES, ""); This has the side effect of configuring the message-catalog system to the correct locale

I am trying to search for elements on a webpage and have used various methods, including text and XPath. It seems that the timeout option does not work the way I expected, and no exception is raised even if the text or XPath is not present in the website's HTML. The code below demonstrates why I am confused. There are three page.find queries. The first one just removes the cookies pop-up, so it can be ignored. The second query: page.find(("emailOrGhin", timeout = 1) works, and as shown in the results, it executes in about 0.01 seconds, which is great. The third query is where I have questions: page.find("emailOrGhinnowayjunkXyq", timeout=1) As shown in the results, this statement seems takes 1.52 seconds to execute, which is longer than the specified timeout of 1 second. Why does t