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In C++, is it still bad practice to return a vector from a function?
...end(), sum2);
}
In the first example, there are many unnecessary dynamic allocations/deallocations happening, which are prevented in the second example by using an output parameter the old way, reusing already allocated memory. Whether or not this optimization is worth doing depends on the relativ...
In Visual Studio C++, what are the memory allocation representations?
...g/wiki/Magic_number_(programming)
* 0xABABABAB : Used by Microsoft's HeapAlloc() to mark "no man's land" guard bytes after allocated heap memory
* 0xABADCAFE : A startup to this value to initialize all free memory to catch errant pointers
* 0xBAADF00D : Used by Microsoft's LocalAlloc(LMEM_FIXED) t...
iOS 7 TableView like in Settings App on iPad
...lor = UIColor.clearColor;
CAShapeLayer *layer = [[CAShapeLayer alloc] init];
CGMutablePathRef pathRef = CGPathCreateMutable();
CGRect bounds = CGRectInset(cell.bounds, 10, 0);
BOOL addLine = NO;
if (indexPath.row == 0 && indexPath.r...
What are the barriers to understanding pointers and what can be done to overcome them? [closed]
...e array.
In memory, there will be some overhead associated with the house allocation, I'll illustrate this below like this:
---[ttttNNNNNNNNNN]---
^ ^
| |
| +- the FName array
|
+- overhead
The "tttt" area is overhead, there will typically be more of this for vari...
Is it better to call ToList() or ToArray() in LINQ queries?
...straints you should use ToList. In the majority of scenarios ToArray will allocate more memory than ToList.
Both use arrays for storage, but ToList has a more flexible constraint. It needs the array to be at least as large as the number of elements in the collection. If the array is larger, th...
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...
iPhone App 开发第一步：从零到真机调试HelloWorld - 更多技术 - 清泛网 - ...
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Mac OSX 系统10.6.7（或...
Proper stack and heap usage in C++?
... It's lifespan: any local variable inside a function (anything you do not malloc() or new) lives on the stack. It goes away when you return from the function. If you want something to live longer than the function that declared it, you must allocate it on the heap.
class Thingy;
Thingy* foo( )
{
...
delete vs delete[] operators in C++
...
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...
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
...