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ArrayBuffer to base64 encoded string
... _arrayBufferToBase64( buffer ) {
var binary = '';
var bytes = new Uint8Array( buffer );
var len = bytes.byteLength;
for (var i = 0; i < len; i++) {
binary += String.fromCharCode( bytes[ i ] );
}
return window.btoa( binary );
}
but, non-native implementations are...
Why would you use an ivar?
...;
static
NSMutableArray * allAccountsB;
static
int64_t getRandom ( const uint64_t min, const uint64_t max ) {
assert(min <= max);
uint64_t rnd = arc4random(); // arc4random() returns a 32 bit value only
rnd = (rnd << 32) | arc4random();
rnd = rnd % ((max + 1) - min); // Tr...
When would anyone use a union? Is it a remnant from the C-only days?
...use case I can think of is this:
typedef union
{
struct
{
uint8_t a;
uint8_t b;
uint8_t c;
uint8_t d;
};
uint32_t x;
} some32bittype;
You can then access the 8-bit separate parts of that 32-bit block of data; however, prepare to potentially be bitte...
Converting numpy dtypes to native python types
... and similar...
type(np.float64(0).item()) # <class 'float'>
type(np.uint32(0).item()) # <class 'long'>
type(np.int16(0).item()) # <class 'int'>
type(np.cfloat(0).item()) # <class 'complex'>
type(np.datetime64(0, 'D').item()) # <class 'datetime.date'>
type(np.datet...
How does one make random number between range for arc4random_uniform()?
...only has 6 sides so I imported Foundation for access to arc4random_uniform(UInt32). I attempted using the range of (1..7) to avoid randomly getting 0 however that returned an error which I didn't enjoy too much. I tried to do this:
...
Fastest way to determine if an integer is between two integers (inclusive) with known sets of values
...uce two branches into one.
If you care about type safe:
if ((int32_t)(((uint32_t)x - (uint32_t)minx) | ((uint32_t)maxx - (uint32_t)x)) > = 0) ...
You can combine more variable range checking together:
if (( (x - minx) | (maxx - x) | (y - miny) | (maxy - y) ) >= 0) ...
This will reduce ...
Is there a constraint that restricts my generic method to numeric types?
...ypes = new[] {
typeof(Int16), typeof(Int32), typeof(Int64),
typeof(UInt16), typeof(UInt32), typeof(UInt64)
};
#>
using System;
public static class MaxMath {
<# foreach (var type in types) {
#>
public static <#= type.Name #> Max (<#= type.Name #> val...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...for pointers; if a structure is declared "packed", taking the address of a uint32_t member will yield a uint32_t packed*; trying to read from such a pointer on e.g. a Cortex-M0 will IIRC call a subroutine which will take ~7x as long as a normal read if the pointer is unaligned or ~3x as long if it's...
MFC 日期时间控件CDateTimeCtrl自绘 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
//-----------------------------------------------------------------
UINT m_nIDLeft, m_nIDRight, m_nIDCenter; //Resource IDs for ComboBox
// Implementation
public:
void SetComboBitmap(UINT nIDLeft, UINT nIDRight, UINT nIDCenter);
virtual ~CMyDateTime();
private:
CFont* m...
Finding the type of an object in C++
...
Does this work for PODs that have been cast to a uint8_t*? That is, can I check that uint32_t* x = dynamic_cast<uint32_t*>(p), where p is uint8_t*? (I'm trying to find a test for punning violations).
– jww
May 25 '19 at 8:46
...