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In a storyboard, how do I make a custom cell for use with multiple controllers?
...k at the class of the cell, as defined in the cell's nib. Call [[CellClass alloc] initWithCoder:].
The -initWithCoder: method goes through and adds subviews and sets properties that were defined in the nib. (IBOutlets probably get hooked up here as well, though I haven't tested that; it may happen i...
Understanding Canvas and Surface concepts
...seen.
A Bitmap is just an interface to some pixel data. The pixels may be allocated by Bitmap itself when you are directly creating one, or it may be pointing to pixels it doesn't own such as what internally happens to hook a Canvas up to a Surface for drawing. (A Bitmap is created and pointed to ...
When should we use mutex and when should we use semaphore
...have to carefully track who currently has responsibility for it, much like allocated memory).
So, if you have a number of instances of a resource (say three tape drives), you could use a semaphore with a count of 3. Note that this doesn't tell you which of those tape drives you have, just that you ...
Why are preprocessor macros evil and what are the alternatives?
...to wrap a function with macros to pass on file/line information:
#define malloc(x) my_debug_malloc(x, __FILE__, __LINE__)
#define free(x) my_debug_free(x, __FILE__, __LINE__)
Now we can use my_debug_malloc as the regular malloc in the code, but it has extra arguments, so when it comes to the end...
Regular cast vs. static_cast vs. dynamic_cast [duplicate]
... // 4 bytes
Since this results in a 4-byte pointer pointing to 1 byte of allocated memory, writing to this pointer will either cause a run-time error or will overwrite some adjacent memory.
*p = 5; // run-time error: stack corruption
In contrast to the C-style cast, the static cast will allow t...
Is there any way to put malicious code into a regular expression?
...ime–space trade‐off.
With a DFA, you spend more time building it (and allocating more states), whereas with an NFA you spend more time executing it, since it can be multiple states at the same time, and backtracking can eat your lunch — and your CPU.
Denial‐of‐Service Solutions
Probably...
Can dplyr package be used for conditional mutating?
...the 2nd iteration forward (which might affect timing since DT$g is already allocated?), the result also propagates back to ans1 and therefore might (if R's optimizer deems it necessary? Not sure on this...) avoid another copy that DPLYR_fun and BASE_fun need to make?
– Ken Will...
performSelector may cause a leak because its selector is unknown
...memory management (e.g., that your methods do not return objects that they allocate).
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Learn C first before learning Objective-C [closed]
...es in the end. Variables for objects use pointers, Garbage Collectors use malloc and free, files are locked using OS handles; when something goes wrong in a Java or C# application knowing these fundamentals can greatly improve your understanding of what went wrong. Understanding resource allocation ...
kernel stack and user space stack
...e main difference is the size:
User-space can get away with statically allocating many variables on the stack, including
huge structures and thousand-element arrays.
This behavior is legal because user-space has
a large stack that can dynamically grow.
The kernel stack is neither large n...