大约有 34,900 项符合查询结果（耗时：0.0458秒） [XML]
Pointers in C: when to use the ampersand and the asterisk?
I'm just starting out with pointers, and I'm slightly confused. I know & means the address of a variable and that * can be used in front of a pointer variable to get the value of the object that is pointed to by the pointer. But things work differently when you're working with arrays, string...
What special characters must be escaped in regular expressions?
...m tired of always trying to guess, if I should escape special characters like ' ()[]{}| ' etc. when using many implementations of regexps.
...
Keyboard Interrupts with python's multiprocessing Pool
How can I handle KeyboardInterrupt events with python's multiprocessing Pools? Here is a simple example:
10 Answers
...
How to have multiple data-bind attributes on one element?
...
Like this:
<a data-bind="html: name, attr: { href: url }">
You use comma-separated bindings - the attribute is the same as passing an object:
{
html: name,
attr: { href: url }
}
Or, if you're asking abou...
Why is it Valid to Concatenate Null Strings but not to Call “null.ToString()”?
...
The reason for first one working:
From MSDN:
In string concatenation operations,the C# compiler treats a null string the same as an empty string, but it does not convert the value of the original null string.
More information on the + binary operator:...
Adding a Method to an Existing Object Instance
...;>> a.barFighters = barFighters
>>> a.barFighters()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: barFighters() takes exactly 1 argument (0 given)
The function is not automatically bound when it's attached directly to an instance:
>...
How to pattern match using regular expression in Scala?
I would like to be able to find a match between the first letter of a word, and one of the letters in a group such as "ABC". In pseudocode, this might look something like:
...
Adding a directory to the PATH environment variable in Windows
...
Peter Mortensen
26.5k2121 gold badges9292 silver badges122122 bronze badges
answered Mar 3 '12 at 13:23
Hans PassantHans ...
NoClassDefFoundError: android.support.v7.internal.view.menu.MenuBuilder
...the Android appcompat v7 library on Samsung devices running Android 4.2. I keep getting crashes with the following stack trace in my Developer Console:
...
What does the exclamation mark do before the function?
...run the function.
Now, when we add the seemingly innocuous exclamation mark: !function foo() {} it turns it into an expression. It is now a function expression.
The ! alone doesn't invoke the function, of course, but we can now put () at the end: !function foo() {}() which has higher precedence th...