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How to add spacing between UITableViewCell
...Path
{
if (cell.IsMonth)
{
UIImageView *av = [[UIImageView alloc] initWithFrame:CGRectMake(20, 20, 20, 20)];
av.backgroundColor = [UIColor clearColor];
av.opaque = NO;
av.image = [UIImage imageNamed:@"month-bar-bkgd.png"];
UILabel *monthTextLabel = [[U...
When do we have to use copy constructors?
...eption the object is left in an undefined state with store pointing at a deallocated part of memory (deallocate the memory ONLY after all operations that can throw have completed succesfully)). A simple solution is to use the copy swap idium.
– Martin York
Jul ...
How to check for valid email address? [duplicate]
...)
>>> parseaddr('invalid-email')
('', 'invalid-email')
So, as @TokenMacGuy put it, the only definitive way of checking an e-mail address is to send an e-mail to the expected address and wait for the user to act on the information inside the message.
However, you might want to check for,...
How do I unit test web api action method when it returns IHttpActionResult?
...testController.Get();
var getResponse = getResult.ExecuteAsync(CancellationToken.None).Result;
Assert.IsTrue(getResponse.IsSuccessStatusCode);
Assert.AreEqual(HttpStatusCode.Success, getResponse.StatusCode);
var idResult = testController.Get(1);
var idResponse = idResult.ExecuteAsync(CancellationTo...
Should I use Java's String.format() if performance is important?
... follow (average of 5 runs each):
Approach Time(ms) Memory allocated (long)
'+' operator 747 320,504
String.format 16484 373,312
StringBuilder 769 57,344
We can see that String '+' and StringBuilder are practicall...
Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC?
... if (sharedInstance == nil) {
sharedInstance = [[MyClass alloc] init];
}
}
return sharedInstance;
}
The benefit of dispatch_once() over this is that it's faster. It's also semantically cleaner, because it also protects you from multiple threads doing alloc init of...
push_back vs emplace_back
...ving does not make s invalid, the move will only steal the internal memory allocation already done in s and leave it in a defaulted state (no sting allocated) which when destructed will be fine as if you had just typed std::string str;
– David
Nov 30 '10 at 0:5...
How do I find where an exception was thrown in C++?
...bt]: (8) ./test(__libc_start_main+0x95) [0x42017589]
[bt]: (9) ./test(__eh_alloc+0x3d) [0x8048b21]
signal 6 (Aborted), address is 0x1239 from 0x42029331
crit_err_hdlr backtrace returned 13 frames
[bt]: (1) ./test(kill+0x11) [0x42029331]
[bt]: (2) ./test(abort+0x16e) [0x4202a8c2]
[bt]: (3) ./test [...
How do you reverse a string in place in JavaScript?
...mmutable strings, thus defeating the whole idea of moving a string without allocating any new memory.
While the solutions above do indeed reverse a string, they do not do it without allocating more memory, and thus do not satisfy the conditions. You need to have direct access to the string as allo...
Running Bash commands in Python
...A common mistake is to use shell=True and then still pass Python a list of tokens, or vice versa. This happens to work in some cases, but is really ill-defined and could break in interesting ways.
# XXX AVOID THIS BUG
buggy = subprocess.run('dig +short stackoverflow.com')
# XXX AVOID THIS BUG TOO
...