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Using boolean values in C
...
From best to worse:
Option 1 (C99)
#include <stdbool.h>
Option 2
typedef enum { false, true } bool;
Option 3
typedef int bool;
enum { false, true };
Option 4
typedef int bool;
#define true 1
#define false 0
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Is errno thread-safe?
... identifier of an object. It might expand to a modifiable lvalue resulting from a function call (for example, *errno()).
Generally, errno is a macro which calls a function returning the address of the error number for the current thread, then dereferences it.
Here is what I have on Linux, in /usr...
What is the difference between RDF and OWL? [closed]
...en to a logical extreme. They have the advantage that you can load triples from many sources into one database with no reconfiguration.
RDF and RDFS
The next layer is RDF - The Resource Description Framework. RDF defines some extra structure to triples. The most important thing RDF defines is a pr...
Start ssh-agent on login
I have a site as a remote Git repo pulling from Bitbucket.com using an SSH alias. I can manually start the ssh-agent on my server but I have to do this every time I login via SSH.
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Hibernate: hbm2ddl.auto=update in production?
...ng a db schema should be handled by the professionals ( dbas ). Recovering from a bad db change is difficult at best. Vova didn't mention it - but what happens if hibernate's update decides to drop a column and re-add it because the type or size changed. And lets say the column is all your users em...
How do I ignore files in a directory in Git?
...n of the .gitignore file (relative to the toplevel of the work tree if not from a .gitignore file).
Otherwise, git treats the pattern as a shell glob suitable for consumption by fnmatch(3) with the FNM_PATHNAME flag: wildcards in the pattern will not match a / in the pathname. For example, Documenta...
What is the difference between string primitives and String objects in JavaScript?
Taken from MDN
12 Answers
12
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How can I reverse a NSArray in Objective-C?
...rse any NSMutableArray in place:
/* Algorithm: swap the object N elements from the top with the object N
* elements from the bottom. Integer division will wrap down, leaving
* the middle element untouched if count is odd.
*/
for(int i = 0; i < [array count] / 2; i++) {
int j = [array co...
What is Cache-Control: private?
...e in the same 15-second window will all get the same contents - all served from close cache. Performance win for everyone.
The virtue of adding Cache-Control: max-age is that the browser doesn't even have to perform a conditional request.
if you specified only Last-Modified, the browser has to pe...
Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
... note
We know that the standard says undefined behavior is unpredictable from the note that come with the definition which says:
[ Note: Undefined behavior may be expected when this International
Standard omits any explicit definition of behavior or when a program
uses an erroneous constru...