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delete vs delete[] operators in C++
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The delete operator deallocates memory and calls the destructor for a single object created with new.
The delete [] operator deallocates memory and calls destructors for an array of objects created with new [].
Using delete on a pointer returned...
Generate JSON string from NSDictionary in iOS
...escription);
return @"{}";
} else {
return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}
}
@end
.
@interface NSArray (BVJSONString)
- (NSString *)bv_jsonStringWithPrettyPrint:(BOOL)prettyPrint;
@end
.
@implementation NSArray (BVJSONString...
Does delete on a pointer to a subclass call the base class destructor?
I have an class A which uses a heap memory allocation for one of its fields. Class A is instantiated and stored as a pointer field in another class ( class B .
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Do Java arrays have a maximum size?
...Kevin Bourrillion: This seems to have changed, using Oracle 1.7.0_07 I can allocate up to MAX_VALUE-2 elements. This is independent of what I allocate, and I really wonder what can the VM use the two "things" for (the length doesn't fit in 2 bytes).
– maaartinus
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How do I use valgrind to find memory leaks?
...P SUMMARY:
in use at exit: 0 bytes in 0 blocks
total heap usage: 636 allocs, 636 frees, 25,393 bytes allocated
All heap blocks were freed -- no leaks are possible
ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
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Returning an array using C
...ring scope, i.e., when the function returns.
You will need to dynamically allocate the memory inside of the function or fill a preallocated buffer provided by the caller.
Option 1:
dynamically allocate the memory inside of the function (caller responsible for deallocating ret)
char *foo(int cou...
Declare slice or make slice?
... }
return p
}
It means that, to append to a slice, you don't have to allocate memory first: the nil slice p int[] is enough as a slice to add to.
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Returning a C string from a function
...9+1 (=10!) bytes. This is important to know when you finally get around to allocating strings dynamically.
So, without this 'terminating zero', you don't have a string. You have an array of characters (also called a buffer) hanging around in memory.
Longevity of data:
The use of the function this...
Convert a bitmap into a byte array
...an code. The simplest way is to pin the array: GCHandle handle = GCHandle.Alloc(bufferarray, GCHandleType.Pinned); get the pointer to the array IntPtr iptr = Marshal.UnsafeAddrOfPinnedArrayElement(bufferarray, 0); then create a new bitmap using the IntPtr: bitmap = new Bitmap(width, height, (width ...
How to track down a “double free or corruption” error
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If you're using glibc, you can set the MALLOC_CHECK_ environment variable to 2, this will cause glibc to use an error tolerant version of malloc, which will cause your program to abort at the point where the double free is done.
You can set this from gdb by using ...