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hash function for string
...enkins One At A Time Hash. It also quotes improved versions of this hash.
uint32_t jenkins_one_at_a_time_hash(char *key, size_t len)
{
uint32_t hash, i;
for(hash = i = 0; i < len; ++i)
{
hash += key[i];
hash += (hash << 10);
hash ^= (hash >> 6);
...
Timer function to provide time in nano seconds using C++
...rors, and may yield incorrect timing values on certain processors)
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...
What does static_assert do, and what would you use it for?
...ly occupy 32 bits of memory, leaving 16 of them unused (and thus the macro UINT_MAX would be equal to 65535). So the way you describe the first static assertion ("unsigned int object having exactly 32 bits") is misleading. To match your description, this assertion should be included as well : static...
What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?
... to float conversion! So use that.
double ff=(double)(v|1);
return ((*(1+(uint32_t *)&ff))>>20)-1023; // assumes x86 endianness
This version casts the value to a double, then reads off the exponent, which tells you where the bit was. The fancy shift and subtract is to extract the prope...
How to get current timestamp in milliseconds since 1970 just the way Java gets
...ast<milliseconds>(d)
translate std::chrono::milliseconds to integer (uint64_t to avoid overflow)
#include <chrono>
#include <cstdint>
#include <iostream>
uint64_t timeSinceEpochMillisec() {
using namespace std::chrono;
return duration_cast<milliseconds>(system_cl...
MFC学习总结 (90个技巧) dlg 上建立View - C/C++ - 清泛网 - 专注C++内核技术
...
二、重载该类的OnMouseMove函数：
void CMySplitter::OnMouseMove(UINT nFlags, CPoint point)
{
"// 限制切分条的运动范围。
"if(point.x<228||point.x>600)
"{
""CWnd::OnMouseMove(nFlags, point);
"}
"else
"{
""CSplitterWnd::OnMouseMove(nFlags, point);
"}
}
三、...
How to count the number of set bits in a 32-bit integer?
...e, you may need to adjust it to work for a particular language (e.g. using uint32_t for C++ and >>> in Java):
int numberOfSetBits(uint32_t i)
{
// Java: use int, and use >>> instead of >>
// C or C++: use uint32_t
i = i - ((i >> 1) & 0x55555555);
...
How can I declare and define multiple variables in one line using C++?
...r if they just happen to be the same type now but don't really need to be (uint8_t height, width; might turn into uint8_t height; uint16_t width; in the future and should have been uint8_t height; uint8_t width; to begin with).
– altendky
Jun 17 '15 at 15:08
...
Call Go functions from C
..., we can assign it its own type:
type ProgressHandler func(current, total uint64, userdata interface{}) int
This handler takes some progress info (current number of files received and total number of files) along with an interface{} value which can hold anything the user needs it to hold.
Now we...
GridCtrl 控件FAQ - C/C++ - 清泛网 - 专注C/C++及内核技术
...某个单元格为只读
BOOL CGridCtrl::SetItemState(int nRow, int nCol, UINT state)
一般需配合使用UINT CGridCtrl::GetItemState(int nRow, int nCol) const
比如将单元格（1，1）设为只读
CGridCtrlObject.SetItemState(1,1, m_Grid.GetItemState(1,1) | GVIS_READONLY);
将单元格...