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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...
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...
Python function overloading
...working with languages that can discriminate data types at
compile-time, selecting among the alternatives can occur at
compile-time. The act of creating such alternative functions for
compile-time selection is usually referred to as overloading a
function. (Wikipedia)
Python is a dynamical...
Stack smashing detected
...ple in the following snippet:
#include <stdio.h>
void func()
{
char array[10];
gets(array);
}
int main(int argc, char **argv)
{
func();
}
The compiler, (in this case gcc) adds protection variables (called canaries) which have known values. An input string of size greater than ...
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...
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...
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...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ading this thing if no one is gonna use it.
The control features:
Cell selection using the mouse, with optional Control and Shift key combinations. Selection can be disabled.
Row and Column resizing. Sizing can be disabled for row, columns or both.
Auto row or column sizing when dividers are d...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ading this thing if no one is gonna use it.
The control features:
Cell selection using the mouse, with optional Control and Shift key combinations. Selection can be disabled.
Row and Column resizing. Sizing can be disabled for row, columns or both.
Auto row or column sizing when dividers are d...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ading this thing if no one is gonna use it.
The control features:
Cell selection using the mouse, with optional Control and Shift key combinations. Selection can be disabled.
Row and Column resizing. Sizing can be disabled for row, columns or both.
Auto row or column sizing when dividers are d...