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Hidden features of C
...
int8_t
int16_t
int32_t
uint8_t
uint16_t
uint32_t
These are an optional item in the standard, but it must be a hidden feature, because people are constantly redefining them. One code base I've worked on (and still do, for now) has multiple redefi...
Is gettimeofday() guaranteed to be of microsecond resolution?
...ons of detail.
#include <stdio.h>
#include <stdint.h>
inline uint64_t rdtsc() {
uint32_t lo, hi;
__asm__ __volatile__ (
"xorl %%eax, %%eax\n"
"cpuid\n"
"rdtsc\n"
: "=a" (lo), "=d" (hi)
:
: "%ebx", "%ecx");
return (uint64_t)hi << 32 ...
MFC OnKeyDown没反应，不响应键盘操作 - C/C++ - 清泛网 - 专注C/C++及内核技术
...OnKeyDown函数来完成消息的捕捉和响应。afx_msg void OnKeyDown(UINT nChar, UINT nRepCnt, U...在MFC中添加键盘的消息响应，通常是通过OnKeyDown函数来完成消息的捕捉和响应。
afx_msg void OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);
...
BEGIN_MESSAGE_MA...
ASP.NET Identity's default Password Hasher - How does it work and is it secure?
...6, 128-bit salt, 256-bit subkey, 10000 iterations.
* Format: { 0x01, prf (UInt32), iter count (UInt32), salt length (UInt32), salt, subkey }
* (All UInt32s are stored big-endian.)
*/
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What is the meaning of “POSIX”?
...sn't specified, but I know that at minimum Posix requires the existence of uint8_t, uint16_t, uint32_t and the corresponding signed types. I'm not sure if it guarantees that types like "int" have power-of-two sizes and that a system won't do something nasty like have an "int" with 32 value bits, 1 ...
Check for internet connection availability in Swift
...ddr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
SCNetworkReachabilityCreateWithAddress(nil, Unsaf...
Purpose of Unions in C and C++
...lity, then you can just use the struct and provide a setter that takes the uint32_t and sets the fields appropriately through bitmask operations. The same can be done in C with a function.
Edit: I was expecting AProgrammer to write down an answer to vote and close this one. As some comments have po...
Compile time string hashing
...re is the code snippet:
// CRC32 Table (zlib polynomial)
static constexpr uint32_t crc_table[256] = {
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe...
How to write log base(2) in c/c++
...could use a lookup table like in Bit Twiddling Hacks (integer log2 only).
uint32_t v; // find the log base 2 of 32-bit v
int r; // result goes here
static const int MultiplyDeBruijnBitPosition[32] =
{
0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30,
8, 12, 20, 28, 15, 17, 24, 7...
How to find the type of an object in Go?
...ssertions - allows grouping types, for example recognize all int32, int64, uint32, uint64 types as "int"
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