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Convert NSArray to NSString in Objective-C
...iption message on each item:
NSMutableString * result = [[NSMutableString alloc] init];
for (NSObject * obj in array)
{
[result appendString:[obj description]];
}
NSLog(@"The concatenated string is %@", result);
Another approach would be to do something based on each item's class:
NSMutableS...
Technically, why are processes in Erlang more efficient than OS threads?
... registers, address space mapping, etc.).
Erlang processes use dynamically allocated stacks, which start very small and grow as necessary. This permits the spawning of many thousands — even millions — of Erlang processes without sucking up all available RAM.
Erlang used to be single-threaded, me...
std::string to char*
..., then because I want to call C code which changes the string and C code deallocates stuff with free() and allocates with malloc() (strdup uses malloc). So if I pass my raw string to some function X written in C it might have a constraint on it's argument that it has to allocated on the heap (for ex...
What is a deadlock?
...o process P1 and p2 and there are two resources R1 and R2.
Resource R1 is allocated to process P1 and resource R2 is allocated to process p2.
To complete execution of process P1 needs resource R2, so P1 request for R2, but R2 is already allocated to P2.
In the same way Process P2 to complete its ...
Good or bad practice for Dialogs in wpf with MVVM?
...ed notification from others in the handler. Two solutions:
send a unique token on opening a dialogue window and check that token in the subscription
use generic notification classes <T> where T is enumeration of entities (or for simplicity it can be type of ViewModel).
For a project should ...
How to get IntPtr from byte[] in C#
...th unmanaged code by using Mashal.Copy:
IntPtr unmanagedPointer = Marshal.AllocHGlobal(bytes.Length);
Marshal.Copy(bytes, 0, unmanagedPointer, bytes.Length);
// Call unmanaged code
Marshal.FreeHGlobal(unmanagedPointer);
Alternatively you could declare a struct with one property and then use Marsh...
Any way to replace characters on Swift String?
... self.replaceCharacters(characters, toSeparator: "")
}
}
Usage:
let token = "<34353 43434>"
token.replaceCharacters("< >", toString:"+")
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Performance of Arrays vs. Lists
...t to and probably less than the capacity of the _items array. The array is allocated with excess capacity to make adding future items quicker by not requiring re-allocation for every addition.
– Trasvi
Dec 17 '15 at 0:42
...
Why is a boolean 1 byte and not 1 bit of size?
...ovide sub-byte pointers as an extension, but "ordinary" objects like bool, allocated in ordinary ways, have to do what the standard says.
– Steve Jessop
Jan 8 '11 at 15:43
...
Is it safe to push_back an element from the same vector?
If the second push_back causes a reallocation, the reference to the first integer in the vector will no longer be valid. So this isn't safe?
...