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How to convert linq results to HashSet or HashedSet
...f T explicitly:
var query = from i in Enumerable.Range(0, 10)
select new { i, j = i + 1 };
var resultSet = query.ToHashSet();
You can't do that with an explicit call to the HashSet<T> constructor. We're relying on type inference for generic methods to do it for us.
Now you coul...
static linking only some libraries
... libraries after object files — especially static libraries. In ancient and modern versions of the link environment (I'm not sure of the status quo for modestly old versions as of November 2010), listing the static library before the code.c file guarantees that the symbols in it will be ignored u...
What does && mean in void *p = &&abc;
... defined in the current function.
void *p = &&abc is illegal in standard C99 and C++.
This compiles with g++.
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How to use Active Support core extensions
I have Active Support 3.0.3 installed and Rails 3.0.3 with Ruby 1.8.7.
5 Answers
5
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How to determine the content size of a UIWebView?
...ce we do both frame changes right after each other, the view isn't updated and doesn't flicker.
Of course, we have to wait until the content has been loaded, so we put the code into the -webViewDidFinishLoad: delegate method.
Obj-C
- (void)webViewDidFinishLoad:(UIWebView *)aWebView {
CGRect f...
Redis is single-threaded, then how does it do concurrent I/O?
...pends on how you define concurrency.
In server-side software, concurrency and parallelism are often considered as different concepts. In a server, supporting concurrent I/Os means the server is able to serve several clients by executing several flows corresponding to those clients with only one com...
PreparedStatement with list of parameters in a IN clause [duplicate]
... possibleValue.size(); i++ ) {
builder.append("?,");
}
String stmt = "select * from test where field in ("
+ builder.deleteCharAt( builder.length() -1 ).toString() + ")";
PreparedStatement pstmt = ...
And then happily set the params
int index = 1;
for( Object o : possibleVal...
What's the difference between VARCHAR and CHAR?
...CHAR(10),
Street VARCHAR(10));
Insert into temp
values('Pune','Oxford');
select length(city), length(street) from temp;
Output will be
length(City) Length(street)
10 6
Conclusion: To use storage space efficiently must use VARCHAR Instead CHAR if variable length is ...
How to find what code is run by a button or element in Chrome using Developer Tools
... tab, and on the right find Event
Listener Breakpoints:
Expand Mouse and select click
Now click the element (execution should pause), and you are now debugging the code. You can go through all code pressing F11 (which is Step in). Or go back a few jumps in the stack. There can be a ton of jumps
...
Choosing a file in Python with simple Dialog
...= askopenfilename() # show an "Open" dialog box and return the path to the selected file
print(filename)
Done!
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