Stack Overflow
Stack Overflow

Questions tagged [alloc]

207 questions
0
votes
2 answers

Conditional alloc/dealloc? [Objective-c and Cocos2D]

What if I want to alloc a class inside another and I want to reference it easily, but sometimes this class would not need to be alloc'd, therefore not dealloc'd. How is this done? Can I put a conditional inside dealloc so it doesn't have to be…
Chewie The Chorkie
  • 4,896
  • 9
  • 46
  • 90
0
votes
2 answers

NSString init or alloc error?

I have this interface: #import @interface Cards : NSObject { NSString* effect; NSString* image; } -(NSString*) effect; -(NSString*) image; -(void) setEffect: (NSString*) effect2; -(void) setImage: (NSString*)…
dgTheUser
  • 21
  • 3
0
votes
1 answer

Questions about a small memory allocation program (41 lines)

Questions Does the "memory storage array" allocbuf[10] save everything back to back. For example allocbuf[10] is full with {F, i, r, s, t, \0, S, e, c, \0] and I'll state how allocbuf became full. I imagine all of the information I save into…
Renzo M-Svartz
  • 13
  • 5
0
votes
0 answers

How to access allocation metadata

Here is a code out of curiosity. I'm trying to figure out how to access my allocation metadata. When I do chunk = second_alloc - sizeof (struct malloc_chunk); I manage to recover information, but if I do chunk = first_alloc - sizeof (struct…
Blue
  • 25
  • 1
  • 4
0
votes
1 answer

Too much heap memory usage when reallocing

Valgrind says that 42 718 bytes were allocated, however, when I see how many times the reallocation procces is called, it's 3 or 6 times and variables currentLength and currentLineLength are 10 20 30 or 10 20 30 40 50 60, so the problem isn't in the…
tomashauser
  • 561
  • 3
  • 16
0
votes
3 answers

Objective-C class inheritance and allocation

Given the line below where Square is a subclass of Rectangle: Rectangle *thisObject = [[Square alloc] init]; thisObject contains: 1. All the instance variables of a Square object. 2. All the instance methods implemented in the Square object. 3. …
user523234
  • 14,323
  • 10
  • 62
  • 102
0
votes
5 answers

objective-c: alloc vs synthesise/retain

I have a beginner's question. I would like to have access to an UIView in all parts of my code (as opposed to a single method/function). I therefore declared it in the @interface section UIView *calendarView; and then @property (nonatomic, retain)…
n.evermind
  • 11,944
  • 19
  • 78
  • 122
0
votes
2 answers

When declaring a new String Object, is it necessary to instantiate it first?

Is it necessary to do instantiation for a new string object as the following code shows: NSString *newText = [[NSString alloc] initWithFormat:@"%@",sender.titleLabel.text]; Or can we simply run the following code: NSString *newText =…
Zhen
  • 12,361
  • 38
  • 122
  • 199
0
votes
0 answers

What is the fastest way to initialize newly allocated memory in C++?

I'm trying to allocate and use 100 MB of data (size_t s = 100 * 1024 * 1024) and measured different ways in C++: Raw allocation without init: // < 0.01 ms auto p = new char[s]; C++ zero-init: // 20 ms auto p = new char[s](); Manual zero-init: //…
Artificial Mind
  • 945
  • 6
  • 19
0
votes
1 answer

Understanding memory allocations and pointers in c

I am trying to deepen my understanding on Operating systems. My Linux system uses a page size of 4096 bytes. I got that from running the command: [root@localhost]# getconf PAGESIZE 4096 I also know that a page is the least addressable memory unit.…
aboria
  • 123
  • 6
0
votes
0 answers

Memory allocation of a very large block always possible?

If I make a std::vector which nearly as large as the heap size of the process is, what happens if there is a small chunk of memory allocted just in the middle of the heap? Will the "alloc" call be successful and the memory management of the…
Ernie Mur
  • 481
  • 3
  • 18
0
votes
1 answer

alloc implementation in c programming

#define ALLOCSIZE 10000 /* size of available space */ static char allocbuff[ALLOCSIZE]; /* STORAGE FOR alloc */ static char *allocp = allocbuff; /* next free position */ char *alloc(int n) /* return pointer to n characters */ { …
sri harsha
  • 23
  • 1
  • 8
0
votes
4 answers

how can I allocate and initialize an object, so it should not reload again when ViewDidLoad Loads?

I have initialized an delegate object in ViewDidLoad of my ViewController, but when I am again loading it, it is initializing the value again. I am saving some some sort of array in that delegate object which I want to access using getObject and…
Chatar Veer Suthar
  • 15,541
  • 26
  • 90
  • 154
0
votes
1 answer

Is there a way to allocate memory in a .NET process that is "executable"?

I was wondering if there is any way to allocate memory in a process and have that memory be r/w & executable? I found System.Runtime.InteropServices.Marshal.AllocHGlobal, dunno if that the thing I am looking for, if so then how does it work? I don't…
JazzEX
  • 119
  • 1
  • 2
  • 6
0
votes
0 answers

C++ way to override basic_string

I am using gcc 2.95.3 to support a legacy system that uses multi-threaded application. STL implementation for basic_string is not threadsafe and STL implementation for __default_alloc_template::allocate(unsigned int) too. If I could…
Dr. Debasish Jana
  • 6,980
  • 4
  • 30
  • 69
1 2 3
…
13 14