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When should I use perror(“…”) and fprintf(stderr, “…”)?
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edited Aug 22 '16 at 20:11
Jonathan Lam
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an...
Java HashMap performance optimization / alternative
...ted out the hashCode() method was to blame. It was only generating around 20,000 codes for 26 million distinct objects. That is an average of 1,300 objects per hash bucket = very very bad. However if I turn the two arrays into a number in base 52 I am guaranteed to get a unique hash code for every o...
Two divs, one fixed width, the other, the rest
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Difference between size_t and std::size_t
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C's size_t and C++'s std::size_t are both same.
In C, it's defined in <stddef.h> and in ...
What's the longest possible worldwide phone number I should consider in SQL varchar(length) for phon
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80
Well considering there's no overhead difference between a varchar(30) and a varchar(100) if you'...
CSS opacity only to background color, not the text on it? [duplicate]
...;integer>s or <percentage>s, where the number 255 corresponds to 100%. A (alpha) can be a <number> between 0 and 1, or a <percentage>, where the number 1 corresponds to 100% (full opacity).
RGBa example
rgba(51, 170, 51, .1) /* 10% opaque green */
rgba(51, 170, 51, .4) /...
How to git-svn clone the last n revisions from a Subversion repository?
... start your clone at ( -r$REV:HEAD).
For example: git svn clone -s -r1450:HEAD some/svn/repo
Git's data structure is based on pointers in a directed acyclic graph (DAG), which makes it trivial to walk back n commits. But in SVN ( and therefore in Git-SVN) you will have to find the revision num...
Having a UITextField in a UITableViewCell
...essoryType = UITableViewCellAccessoryNone;
if ([indexPath section] == 0) {
UITextField *playerTextField = [[UITextField alloc] initWithFrame:CGRectMake(110, 10, 185, 30)];
playerTextField.adjustsFontSizeToFitWidth = YES;
playerTextField.textColor = [UIColor blackColor];
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Why does sys.exit() not exit when called inside a thread in Python?
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edited Dec 10 '19 at 22:37
Richard
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Does MySQL ignore null values on unique constraints?
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440
Yes, MySQL allows multiple NULLs in a column with a unique constraint.
CREATE TABLE table1 (x I...