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Can I call memcpy() and memmove() with “number of bytes” set to zero?
...ssembly, and try to copy most of the bits using the native word size (e.g. uint32_t on x86), but that doesn't change the substance of the answer: it's a while loop that doesn't need great calculations before starting, so the check is already done.
– Matteo Italia
...
菜单的背景颜色 - C/C++ - 清泛网 - 专注C/C++及内核技术
...s//设置菜单项左边的位图
函数定义：BOOL SetMenuItemBitmaps( UINT nPosition, UINT nFlags, const CBitmap* pBmpUnchecked, const CBitmap* pBmpChecked );
nPostion指明具体要设置的菜单项，可以是菜单项索引，菜单项ID，具体由nFlags参数指明，为MF_BYPOSITION，...
How do I get the color from a hexadecimal color code using .NET?
...hod:
static class ExtensionMethods
{
public static Color ToColor(this uint argb)
{
return Color.FromArgb((byte)((argb & -16777216)>> 0x18),
(byte)((argb & 0xff0000)>> 0x10),
(byte)((argb & 0...
In C/C++ what's the simplest way to reverse the order of bits in a byte?
... 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf, };
uint8_t reverse(uint8_t n) {
// Reverse the top and bottom nibble then swap them.
return (lookup[n&0b1111] << 4) | lookup[n>>4];
}
// Detailed breakdown of the math
// + lookup reverse of bottom nibble...
Simple calculations for working with lat/lon and km distance?
...> CLLocation {
let latDistance = (Double(arc4random()) / Double(UInt32.max)) * offset * 2.0 - offset
let longDistanceMax = sqrt(offset * offset - latDistance * latDistance)
let longDistance = (Double(arc4random()) / Double(UInt32.max)) * longDistanceMax * 2.0 - longDistanc...
Creating a BLOB from a Base64 string in JavaScript
...his array of byte values into a real typed byte array by passing it to the Uint8Array constructor.
const byteArray = new Uint8Array(byteNumbers);
This in turn can be converted to a BLOB by wrapping it in an array and passing it to the Blob constructor.
const blob = new Blob([byteArray], {type: c...
Pandas read_csv low_memory and dtype options
...ain use is for indexing. See more here
'Int8', 'Int16', 'Int32', 'Int64', 'UInt8', 'UInt16', 'UInt32', 'UInt64' are all pandas specific integers that are nullable, unlike the numpy variant.
'string' is a specific dtype for working with string data and gives access to the .str attribute on the series...
What's the best way to do a backwards loop in C/C#/C++?
...
You can declare i as uint.See Marc Gravell's post.
– Jack Griffin
Nov 10 '19 at 16:57
...
Most common C# bitwise operations on enums
...umerable.Range(0, 64)
.Where(bit => ((flags.GetTypeCode() == TypeCode.UInt64 ? (long)(ulong)flags : Convert.ToInt64(flags)) & (1L << bit)) != 0)
.Select(bit => Enum.ToObject(flags.GetType(), 1L << bit))`
Enums.NET flags.GetFlags()
I'm trying to get these improvements i...
Draw a perfect circle from user's touch
...touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
uint pointCount = [pointStack count];
//assume the circle was drawn a constant rate and the half way point will serve to calculate or diameter
CGPoint startPoint = [pointStack objectAtIndex:0];
CGPoint halfWayPoi...