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Programmatically find the number of cores on a machine
...CPU = sysconf(_SC_NPROC_ONLN);
Objective-C (Mac OS X >=10.5 or iOS)
NSUInteger a = [[NSProcessInfo processInfo] processorCount];
NSUInteger b = [[NSProcessInfo processInfo] activeProcessorCount];
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How do I get the type of a variable?
...
case typeid(myClassB):
// handle that case
break;
case typeid(uint32_t):
// handle that case
break;
default:
// handle that case
}
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How to go from Blob to ArrayBuffer
...rayBuffer(blob);
Here's a longer example:
// ArrayBuffer -> Blob
var uint8Array = new Uint8Array([1, 2, 3]);
var arrayBuffer = uint8Array.buffer;
var blob = new Blob([arrayBuffer]);
// Blob -> ArrayBuffer
var uint8ArrayNew = null;
var arrayBufferNew = null;
var fileReader = ne...
How to hide close button in WPF window?
...ort("user32.dll")]
private static extern bool EnableMenuItem(IntPtr hMenu, uint uIDEnableItem, uint uEnable);
private const uint MF_BYCOMMAND = 0x00000000;
private const uint MF_GRAYED = 0x00000001;
private const uint SC_CLOSE = 0xF060;
private const int WM_SHOWWINDOW = 0x00000018;
private const ...
When is assembly faster than C?
... the high part of 64 bit integer multiplication: A portable version using uint64_t for 32x32 => 64-bit multiplies fails to optimize on a 64-bit CPU, so you need intrinsics or __int128 for efficient code on 64-bit systems.
_umul128 on Windows 32 bits: MSVC doesn't always do a good job when multip...
Fast Bitmap Blur For Android SDK
...oid_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
typedef struct {
uint8_t red;
uint8_t green;
uint8_t blue;
uint8_t alpha;
} rgba;
JNIEXPORT void JNICALL Java_com_insert_your_package_ClassName_functionToBlur(JNIEnv* env, jobject obj, jobject bitmapIn, jobject bitmapOut, jint ra...
How to print (using cout) a number in binary form?
...et<sizeof(T) * 8>(x);
return ss.str();
}
Usage:
int main(){
uint16_t x=8;
std::cout << toBinaryString(x);
}
This works with all kind of integers.
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How can one print a size_t variable portably using the printf family?
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Or: you could cast to a uint64_t and then use the PRIu64 macro from inttypes.h, which contains the format specifier.
– James Ko
Sep 2 '16 at 16:50
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byte + byte = int… why?
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C#
ECMA-334 states that addition is only defined as legal on int+int, uint+uint, long+long and ulong+ulong (ECMA-334 14.7.4). As such, these are the candidate operations to be considered with respect to 14.4.2. Because there are implicit casts from byte to int, uint, long and ulong, all the add...
How can mixed data types (int, float, char, etc) be stored in an array?
...tagged pointer
enum { is_int, is_double, is_char_p, is_char } type;
// ...
uintptr_t addr = (uintptr_t)tp & ~0x03; // clear the 2 low bits in the pointer
switch ((uintptr_t)tp & 0x03) // check the tag (2 low bits) for the type
{
case is_int: // data is int
printf("%d\n", *((...