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How to draw a custom UIView that is just a circle - iPhone app
... could use QuartzCore and do something this --
self.circleView = [[UIView alloc] initWithFrame:CGRectMake(10,20,100,100)];
self.circleView.alpha = 0.5;
self.circleView.layer.cornerRadius = 50; // half the width/height
self.circleView.backgroundColor = [UIColor blueColor];
...
Python (and Python C API): __new__ versus __init__
...One example is when you unpickle objects from a pickle file, they will get allocated (__new__) but not initialised (__init__).
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If strings are immutable in .NET, then why does Substring take O(n) time?
...nal with only a small amount (typically O(1) or O(lg n)) of copying or new allocation is called a "persistent" immutable data structure. Strings in .NET are immutable; your question is essentially "why are they not persistent"?
Because when you look at operations that are typically done on strings ...
C# int to byte[]
...sides, doing the assignment is cheap since it does not copy the memory nor allocate new memory, it just adds a new name to the already allocated array. So why not do it?
– paracycle
May 7 '19 at 15:54
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How to increment a pointer address and pointer's value?
... an example, this might help;
char **str;
str = (char **)malloc(sizeof(char*)*2); // allocate mem for 2 char*
str[0]=(char *)malloc(sizeof(char)*10); // allocate mem for 10 char
str[1]=(char *)malloc(sizeof(char)*10); // allocate mem for 10 char
strcpy(str[0...
How to use http.client in Node.js if there is basic authorization
... is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead
– Sourabh
Mar 22 '19 at 11:11
add a ...
Making an array of integers in iOS
...nd of expert-level optimization is under the hood of NSArray? Smart memory allocation that simply probably doubles the size of allocated memory once it hits the limit? :)p
– Ben Sinclair
May 18 '14 at 0:37
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How to take a screenshot programmatically on iOS
...ge*) getGLScreenshot {
NSInteger myDataLength = 320 * 480 * 4;
// allocate array and read pixels into it.
GLubyte *buffer = (GLubyte *) malloc(myDataLength);
glReadPixels(0, 0, 320, 480, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
// gl renders "upside down" so swap top to bottom into ...
Remove columns from dataframe where ALL values are NA
...m.time({df1 <- bd[,colSums(is.na(bd) < nrow(bd))]})
# error -- can't allocate vector of size ...
system.time({df2 <- bd[, !apply(is.na(bd), 2, all)]})
# error -- can't allocate vector of size ...
system.time({df3 <- Filter(function(x)!all(is.na(x)), bd)})
## user system elapsed
## 0.26...
How can I create a UILabel with strikethrough text?
...
NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc] initWithString:@"Your String here"];
[attributeString addAttribute:NSStrikethroughStyleAttributeName
value:@2
range:NSMakeRange(0, [attributeString length])];
Swift
le...