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linux下iptables配置详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...(1)查看本机关于IPTABLES的设置情况
[root@tp ~]# iptables -L -n
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
t...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
内存优化总结:ptmalloc、tcmalloc和jemallocmemory-optimize需求系统的物理内存是有限的，而对内存的需求是变化的, 程序的动态性越强，内存管理就越重要，选择合适的内存管理算法会带来明显的性能提升。比如nginx， 它在每个连接accept...
When should I use the Visitor Design Pattern? [closed]
I keep seeing references to the visitor pattern in blogs but I've got to admit, I just don't get it. I read the wikipedia article for the pattern and I understand its mechanics but I'm still confused as to when I'd use it.
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delete word after or around cursor in VIM
I'm now switching to VIM from TextMate. I found ^+W in INSERT mode very useful. However, I'd like to delete not only the word before cursor, but the word after or around cursor as well.
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How do I remove an item from a stl vector with a certain value?
... you're doing this operation intensively, it can be worth considering std::set instead for this reason.
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How to get the month name in C#?
How does one go about finding the month name in C#? I don't want to write a huge switch statement or if statement on the month int . In VB.Net you can use MonthName() , but what about C#?
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How can I send mail from an iPhone application
...ontroller alloc] init];
controller.mailComposeDelegate = self;
[controller setSubject:@"My Subject"];
[controller setMessageBody:@"Hello there." isHTML:NO];
if (controller) [self presentModalViewController:controller animated:YES];
[controller release];
Then the user does the work and you get the...
How do I use a Boolean in Python?
...)
empty sequences (list, tuple, string)
empty mapping types (dictionary, set, etc)
custom classes that implement __bool__ or __len__ method that returns False or 0.
every class in python has truth values defined by a special instance method:
__bool__(self) OR
__len__
When you call bool(x) ...
Can I have onScrollListener for a ScrollView?
...de in the answer introduces a memory leak. Since the method is add and not set, all listeners will be retained until explicitly removed. So the anonymous class used as a listener implementation in the sample will leak (along with anything it is referencing, i.e. the outer class).
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How do I tell Spring Boot which main class to use for the executable jar?
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Spring Boot 2.x gives an error Could not set unknown property 'mainClass' for object of type org.springframework.boot.gradle.dsl.SpringBootExtension.
– Thunderforge
Jul 6 '18 at 20:15
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