大约有 40,000 项符合查询结果（耗时：0.0710秒） [XML]
How do I execute a command and get the output of the command within C++ using POSIX?
I am looking for a way to get the output of a command when it is run from within a C++ program. I have looked at using the system() function, but that will just execute a command. Here's an example of what I'm looking for:
...
Passing multiple error classes to ruby's rescue clause in a DRY fashion
...oes not have to be a constant.
Splat Operator
The splat operator * "unpacks" an array in its position so that
rescue *EXCEPTIONS
means the same as
rescue FooException, BarException
You can also use it within an array literal as
[BazException, *EXCEPTIONS, BangExcepion]
which is the same ...
Applicatives compose, monads don't
... from a value, and that can be important. However, supporting that power makes monads hard to compose. If we try to build ‘double-bind’
(>>>>==) :: (Monad m, Monad n) => m (n s) -> (s -> m (n t)) -> m (n t)
mns >>>>== f = mns >>-{-m-} \ ns -> let nmn...
NSString: isEqual vs. isEqualToString
...return NO if the object is not a string. isEqualToString: is faster if you know both objects are strings, as the documentation states:
Special Considerations
When you know both objects are strings, this method is a faster way to check equality than isEqual:.
isEqualTo<Class> is used...
JavaScript implementation of Gzip [closed]
... to store JSON data in a small, fixed-size server-side cache via AJAX (think: Opensocial quotas ). I do not have control over the server.
...
How do I search within an array of hashes by hash values in ruby?
...
You're looking for Enumerable#select (also called find_all):
@fathers.select {|father| father["age"] > 35 }
# => [ { "age" => 40, "father" => "Bob" },
# { "age" => 50, "father" => "Batman" } ]
Per the document...
Margin-Top not working for span element?
Can someone tell me what I coded wrong? Everything is working, the only thing is that there is no margin at the top.
5 Answ...
In Python script, how do I set PYTHONPATH?
I know how to set it in my /etc/profile and in my environment variables.
6 Answers
6
...
Understanding keystore, certificates and alias
Is the keystore the actual certificate, or is the alias the certificate?
1 Answer
1
...
Android ListView Divider
...
Folks, here's why you should use 1px instead of 1dp or 1dip: if you specify 1dp or 1dip, Android will scale that down. On a 120dpi device, that becomes something like 0.75px translated, which rounds to 0. On some devices, that t...