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How to set a Django model field's default value to a function call / callable (e.g., a date relative
...cess model data after creating a new user model.
Here is how I generate a token for each new user profile using the first 4 characters of their username:
from django.dispatch import receiver
class Profile(models.Model):
auth_token = models.CharField(max_length=13, default=None, null=True, blan...
Logout: GET or POST?
...evoking a JWT on the server side is a security vulnerability. Even if the tokens are not stored on the server, they should be blacklisted when a user logs out/changes passwords/changes roles/quits/etc to prevent abuse (at least until they expire).
– java-addict301
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When vectors are allocated, do they use memory on the heap or the stack?
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vector<Type> vect;
will allocate the vector, i.e. the header info, on the stack, but the elements on the free store ("heap").
vector<Type> *vect = new vector<Type>;
allocates everything on the free store.
vector<Type*> vect;
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Why malloc+memset is slower than calloc?
It's known that calloc is different than malloc in that it initializes the memory allocated. With calloc , the memory is set to zero. With malloc , the memory is not cleared.
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How to add 2 buttons into the UINavigationbar on the right side without IB?
...ith iOS 5+ it's as easy as:
UIBarButtonItem *btnShare = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(share)];
UIBarButtonItem *btnRefresh = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self ...
What is the meaning of the term arena in relation to memory?
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An arena is just a large, contiguous piece of memory that you allocate once and then use to manage memory manually by handing out parts of that memory. For example:
char * arena = malloc(HUGE_NUMBER);
unsigned int current = 0;
void * my_malloc(size_t n) { current += n; return arena +...
Stack, Static, and Heap in C++
...t understood very well these three concepts. When do I have to use dynamic allocation (in the heap) and what's its real advantage? What are the problems of static and stack? Could I write an entire application without allocating variables in the heap?
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SET NOCOUNT ON usage
...o false. Always read what your client lib suggests since it will interpret token (message) stream instead of you
– Milan Jaric
Jul 31 '19 at 10:34
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Difference between malloc and calloc?
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calloc() gives you a zero-initialized buffer, while malloc() leaves the memory uninitialized.
For large allocations, most calloc implementations under mainstream OSes will get known-zeroed pages from the OS (e.g. via POSIX mm...
How to create fixed space and flexible space bar button items programmatically?
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UIBarButtonItem *fixedItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
fixedItem.width = 20.0f; // or whatever you want
UIBarButtonItem *flexibleItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem...