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Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
...ue representation of that particular size of integer.
and e.g. result of UINT_MAX + 1 is mathematically defined - by the rules of arithmetic modulo 2n
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Generate random string/characters in JavaScript
...rateId :: Integer -> String
function generateId (len) {
var arr = new Uint8Array((len || 40) / 2)
window.crypto.getRandomValues(arr)
return Array.from(arr, dec2hex).join('')
}
console.log(generateId())
// "82defcf324571e70b0521d79cce2bf3fffccd69"
console.log(generateId(20))
// "c1a050a4cd...
How to sum up an array of integers in C#
... This seems to work where Sum doesn’t. It wouldn’t work on an array of uint for some reason but Aggregate would.
– John Ernest
Jul 8 at 23:21
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...
Difference between objectForKey and valueForKey?
...@(10), @"Y":@(20)} valueForKey:@"Z"]); // prints "Value for Z:(null)"
uint32_t testItemsCount = 1000000;
// create huge dictionary of numbers
NSMutableDictionary *d = [NSMutableDictionary dictionaryWithCapacity:testItemsCount];
for (long i=0; i<testItemsCount; ++i) {
// m...
What is the performance of Objects/Arrays in JavaScript? (specifically for Google V8)
...ined",
["Array.prototype.pop"]);
}
var n = TO_UINT32(this.length);
if (n == 0) {
this.length = n;
return;
}
n--;
var value = this[n];
this.length = n;
delete this[n];
return value;
}
function ArrayPush() {
if (IS_NULL_OR_UNDEFINED(this) &&am...
ATL正则表达式库使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...cUrl))
{
// Unexpected error.
return 0;
}
for (UINT nGroupIndex = 0; nGroupIndex < mcUrl.m_uNumGroups;
++nGroupIndex)
{
const CAtlREMatchContext<>::RECHAR* szStart = 0;
const CAtlREMatchContext<>::RECHAR* szEnd = 0;
mcUrl.GetMatch(nGroupI...
Practical use of `stackalloc` keyword
...ublic static unsafe extern HResult CfGetPlaceholderInfo(IntPtr fileHandle, uint infoClass, void* infoBuffer, uint infoBufferLength, out uint returnedLength);
You can make use of stackalloc.
byte* buffer = stackalloc byte[1024];
CfGetPlaceholderInfo(fileHandle, 0, buffer, 1024, out var returnedLen...
Extracting text OpenCV
....RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)
mask = np.zeros(bw.shape, dtype=np.uint8)
for idx in range(len(contours)):
x, y, w, h = cv2.boundingRect(contours[idx])
mask[y:y+h, x:x+w] = 0
cv2.drawContours(mask, contours, idx, (255, 255, 255), -1)
r = float(cv2.countNonZero(mask[y:y+h, x:...
Download a file by jQuery.Ajax
...ase64ToBlob(base64, mimetype, slicesize) {
if (!window.atob || !window.Uint8Array) {
// The current browser doesn't have the atob function. Cannot continue
return null;
}
mimetype = mimetype || '';
slicesize = slicesize || 512;
var bytechars = atob(base64);
va...
How can I create a simple message box in Python?
...mport c_int, WINFUNCTYPE, windll
from ctypes.wintypes import HWND, LPCSTR, UINT
prototype = WINFUNCTYPE(c_int, HWND, LPCSTR, LPCSTR, UINT)
paramflags = (1, "hwnd", 0), (1, "text", "Hi"), (1, "caption", None), (1, "flags", 0)
MessageBox = prototype(("MessageBoxA", windll.user32), paramflags)
Message...