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C++ Lock-free Hazard Pointer（冒险指针） - C/C++ - 清泛网 - 专注C/C++及内核技术
... this;
}
}
private:
std::unique_ptr<T> ptr_;
std::atomic_uint32_t cnt_;
};
仔细观察可以发现：
每一次的读取操作对应引用计数中增加的数值 1；
当所有的读取操作都完成时引用计数归 0，此时内存可以安全回收。
总结起来...
Using generic std::function objects with member functions in one class
...lic:
virtual ~IListener() {}
virtual LRESULT operator()(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) = 0;
};
Listener.h
#include "IListener.h"
template <typename D> class Listener : public IListener {
public:
typedef LRESULT (D::*WMFuncPtr)(HWND hWnd, UINT uMsg, WPARA...
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...
What is the bit size of long on 64-bit Windows?
...16_t - 16-bit integers
int32_t - 32-bit integers
int64_t - 64-bit integers
uintptr_t - unsigned integers big enough to hold pointers
intmax_t - biggest size of integer on the platform (might be larger than int64_t)
You can then code your application using these types where it matters, and being ve...
How to implement an STL-style iterator and avoid common pitfalls?
...imple test
void DoIteratorTest()
{
const static size_t size = 10;
uint8_t *data = new uint8_t[size];
{
// Only for iterator test
uint8_t n = '0';
auto first = begin(data);
auto last = end(data, size);
for (auto it = first; it != last; ++it)
...
How can I get a precise time, for example in milliseconds in Objective-C?
... code is a weird conversion - last line of the first example is "return * (uint64_t *) &elapsedNano;" why not just "return (uint64_t)elapsedNano" ?
– Tyler
Dec 29 '10 at 23:00
...
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、...
Hash and salt passwords in C#
...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.)
*/
public string HashPassword(string password)
{
var prf = KeyDerivationPrf.HMACSHA256;
var rng = RandomNumb...
How to TryParse for Enum value?
...ak;
//case TypeCode.Byte:
//case TypeCode.UInt16:
//case TypeCode.UInt32:
//case TypeCode.UInt64:
default:
tokenUl = Convert.ToUInt64(tokenValue, CultureInfo.InvariantCulture);
br...
How much is the overhead of smart pointers compared to normal pointers in C++?
...#include <iostream>
#include <chrono>
#include <thread>
uint32_t n = 100000000;
void t_m(void){
auto a = (char*) malloc(n*sizeof(char));
for(uint32_t i=0; i<n; i++) a[i] = 'A';
}
void t_u(void){
auto a = std::unique_ptr<char[]>(new char[n]);
for(uint32_t ...