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If my interface must return Task what is the best way to have a no-operation implementation?
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@Asad it reduces allocations (and with it GC time). Instead of allocation new memory and constructing a Task instance each time you need a completed Task, you only do this once.
– i3arnon
Aug 7 '15 at 9:...
string.IsNullOrEmpty(string) vs. string.IsNullOrWhiteSpace(string)
...NullOrEmpty(value) || value.Trim().Length == 0;, which involves new string allocation and two separate checks. Most probably inside IsNullOrWhitespace it is done via single pass without any allocations by checking that each char in the string is the whitespace, hence superior performance. What confu...
iPhone Navigation Bar Title text color
...ear as the title in the navigation bar
UILabel *label = [[[UILabel alloc] initWithFrame:CGRectZero] autorelease];
label.backgroundColor = [UIColor clearColor];
label.font = [UIFont boldSystemFontOfSize:20.0];
label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];...
Add new item in existing array in c#.net
... better way to expand an array then by all means, post it. I doubt your re-allocation and manual copy will be better than using a List though. Sometimes the answer is "don't do that."
– Ed S.
Feb 14 '19 at 20:59
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Should I use a data.frame or a matrix?
...ter in the code of the function only new values were recorded into already allocated spaces, and there was no overhead of adding new rows to the DF. This makes the comparison even more fair, and it also made my job simpler as I did not need to rewrite anything further in the function. Just one line ...
What is the best way to test for an empty string in Go?
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TrimSpace will allocate and copy a new string from the original string, so this approach will introduce inefficiencies at scale.
– Dai
Apr 20 '18 at 1:16
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read file from assets
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You double-allocate memory - first for the buffer and then for the String. Does not work for bigger files.
– JaakL
Jun 28 '17 at 10:10
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Which Python memory profiler is recommended? [closed]
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Note, heapy doesn't include memory allocated in python extensions. If anybody has worked out a mechanism to get heapy to include boost::python objects, it would be nice to see some examples!
– amos
Jul 3 '14 at 18:08
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What do I have to do to get Core Data to automatically migrate models?
...Error *error;
_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&error]) {
// Handle ...
What is move semantics?
...start with a very simple string class which only holds a pointer to a heap-allocated block of memory:
#include <cstring>
#include <algorithm>
class string
{
char* data;
public:
string(const char* p)
{
size_t size = std::strlen(p) + 1;
data = new char[size]...