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explicit casting from super class to subclass
... you're essentially telling the compiler "trust me. I'm a professional, I know what I'm doing and I know that although you can't guarantee it, I'm telling you that this animal variable is definitely going to be a dog."
Since the animal isn't actually a dog (it's an animal, you could do Animal anima...
What does “dereferencing” a pointer mean?
...ate, see "More about memory addresses, and why you probably don't need to know" at the end of this answer.
When you want to access the data/value in the memory that the pointer points to - the contents of the address with that numerical index - then you dereference the pointer.
Different computer...
Why prefer two's complement over sign-and-magnitude for signed numbers?
... to 4 bits for size). In the two's complement way, they are 0010 and 1111. Now, let's say I want to add them.
Two's complement addition is very simple. You add numbers normally and any carry bit at the end is discarded. So they're added as follows:
0010
+ 1111
=10001
= 0001 (discard the carry)
...
How to get index in Handlebars each helper?
...4811
The index of the current array item has been available for some time now via @index:
{{#each array}}
{{@index}}: {{this}}
{{/each}}
For object iteration, use @key instead:
{{#each object}}
{{@key}}: {{this}}
{{/each}}
...
What's the fundamental difference between MFC and ATL?
... them yet.
[Edit embellishment: I did not work at Microsoft, so I don't know if Office was ever built on MFC, but I think the answer is no. Back in Win 3.1, Win 95 days, Office UI team would invent new controls, package them up in libraries, then the Windows and MFC teams would incorporate wrappe...
Any reason not to start using the HTML 5 doctype? [closed]
...ation and markup prerference.
With that said, using <!DOCTYPE html> now and trying to make your markup conform to HTML5 is not a bad idea as long as you stick to stable features that work in browsers now. You wouldn't use anything in HTML4 or XHTML 1.x that doesn't work in browsers, would you...
How can I get the current stack trace in Java?
...
@MightyE The bug is now reported as closed as fixed in Java 6. Looking at the internals, it looks like it now does (new Exception()).getStackTrace() when the requested stack trace is on the current thread (which will always be the case for Thre...
How to get year/month/day from a date object?
...levithan.com/archives/date-time-format.
With that you could write:
var now = new Date();
now.format("yyyy/mm/dd");
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不同品牌的防火墙组成高可靠性集群 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... 100
icmp-echo 172.16.110.80
ip sla schedule 100 life forever start-time now
ip sla 110
icmp-echo 172.16.100.50
ip sla schedule 110 life forever start-time now
track 100 rtr 100 reachability
track 110 rtr 110 reachability
route add 172.16.100.0 255.255.255.0 172.16.110.253 10 track ...
Converting JSON String to Dictionary Not List
...em 0 in the list, as shown below:
json1_data = json.loads(json1_str)[0]
Now you can access the data stored in datapoints just as you were expecting:
datapoints = json1_data['datapoints']
I have one more question if anyone can bite: I am trying to take the average of the first elements in ...