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How do I declare and initialize an array in Java?
...turning it to the caller, it is no longer valid. Using the new keyword you allocate the new object from the heap and it is valid outside the defining scope.
– teukkam
Oct 18 '16 at 9:55
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Array versus linked-list
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@Rick, vectors typically overallocate the space they require so that they don't need to allocate new space everytime the size increases. The result is that vectors are typically much less memory intensive, not more then linked lists.
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How to declare strings in C [duplicate]
... your third example which is bad), the different between 1 and 2 is that 1 allocates space for a pointer to the array.
But in the code, you can manipulate them as pointers all the same -- only thing, you cannot reallocate the second.
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What's the difference between deque and list STL containers?
...ime is linear if capacity is 10 and size is also 10. Its because it has to allocate and copy all the elements to new memory.
– aJ.
Apr 16 '10 at 3:25
5
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How to change the Push and Pop animations in a navigation based app
...s managed to complete this task.
For Push:
MainView *nextView=[[MainView alloc] init];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:0.75];
[self.navigationController pushViewController:nextView animated:NO];
[UIV...
Using arrays or std::vectors in C++, what's the performance gap?
...rator is the same damn thing as
// incrementing a pointer.
Note: If you allocate arrays with new and allocate non-class objects (like plain int) or classes without a user defined constructor and you don't want to have your elements initialized initially, using new-allocated arrays can have perfor...
How do I concatenate two strings in C?
....h>
char* concat(const char *s1, const char *s2)
{
char *result = malloc(strlen(s1) + strlen(s2) + 1); // +1 for the null-terminator
// in real code you would check for errors in malloc here
strcpy(result, s1);
strcat(result, s2);
return result;
}
This is not the fastest wa...
Objective-C class -> string like: [NSArray className] -> @“NSArray”
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Class arrayClass = NSClassFromString (name);
id anInstance = [[arrayClass alloc] init];
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Differences between std::make_unique and std::unique_ptr with new
...untime efficiency the way using make_shared does (due to avoiding a second allocation, at the cost of potentially higher peak memory usage).
* It is expected that C++17 will include a rule change that means that this is no longer unsafe. See C++ committee papers P0400R0 and P0145R3.
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How do I clear the std::queue efficiently?
...uivalent. Since there is no transfer of ownership in the assignment of the allocated memory some containers (like vector) might just call the destructors of the previously held elements and set the size (or equivalent operation with the stored pointers) without actually releasing the memory.
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