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How do I create a URL shortener?
...
Food for thought, it might be useful to add a two character checksum to the url. That would prevent direct iteration of all the urls in your system. Something simple like f(checksum(id) % (62^2)) + f(id) = url_id
– koblas
Sep 4 '10 at...
获取文件系统映像及恢复删除的数据（FAT文件系统格式描述） - C/C++ - 清泛...
...str()<< L"/n";
}
int driveIndex;
std::cin >> driveIndex;//selecting a disk
std::vector<unsigned char> buffer;
//creating a path
std::wstring dumpPath(L"////.//PhysicalDrive");
wchar_t index[MAX_PATH];
_itow(devices.at(driveIndex).vHarddiskIndexes[0], index , MAX_P...
【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...ehashfn(net, daddr, hnum,
saddr, sport);
result = reuseport_select_sock(sk, hash, skb,
sizeof(struct udphdr)); //根据reuseport算法选择一个sock直接返回
if (result)
return result;
matches = 1;
}
result = sk; //使用最大分数的sk作为结...
Is there a way to check if a file is in use?
...is closed after I'm done. I think you'll find that the using() {} is less characters than try {} finally { obj.Dispose() }. You'll also find that you now need to declare your object reference outside the using statement, which is more typing. If you have a explicit interface you'd also have to cas...
Regex for numbers only
...ch more than one digit.
Note that "\d" will match [0-9] and other digit characters like the Eastern Arabic numerals ٠١٢٣٤٥٦٧٨٩. Use "^[0-9]+$" to restrict matches to just the Arabic numerals 0 - 9.
If you need to include any numeric representations other than just digits (like decim...
TLSF源码及算法介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...(0xFFFFFFFF - PTR_MASK)
#define GET_NEXT_BLOCK(_addr, _r) ((bhdr_t *) ((char *) (_addr) + (_r)))
#define MEM_ALIGN ((BLOCK_ALIGN) - 1)
#define ROUNDUP_SIZE(_r) (((_r) + MEM_ALIGN) & ~MEM_ALIGN)
#define ROUNDDOWN_SIZE(_r) ((_r) & ~MEM_ALIGN)
#define ROUNDUP(_x, _v) ...
C++ static virtual members?
...he interface for all the object types:
class Object
{
public:
virtual char* GetClassName() = 0;
};
Now we need an actual implementation. But to avoid having to write both the static and the virtual methods, we will have our actual object classes inherit the virtual methods. This does obviousl...
Practical usage of setjmp and longjmp in C
...(bufferB);
if (r == 0) longjmp(bufferA, 10003);
}
int main(int argc, char **argv)
{
routineA();
return 0;
}
Following figure shows the flow of execution:
Warning note
When using setjmp/longjmp be aware that they have an effect on the validity of local variables often not consider...
Inheriting from a template class in c++
... create objects from any other class). Another such class would be Area<char>. Note that those are completely different classes, which have nothing in common except for the fact that they were generated from the same class template.
Since Area is not a class, you cannot derive the class Recta...
Extracting the last n characters from a ruby string
To get the last n characters from a string, I assumed you could use
8 Answers
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