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How do I analyze a program's core dump file with GDB when it has command-line parameters?
...clude <stdio.h>
#include <stdlib.h>
#include <string.h>
int myfunc(int i) {
*(int*)(NULL) = i; /* line 7 */
return i - 1;
}
int main(int argc, char **argv) {
/* Setup some memory. */
char data_ptr[] = "string in data segment";
char *mmap_ptr;
char *text_pt...
Hashing a dictionary?
...thon 3.3 returns different results between sessions). make_hashable() will convert the object into nested tuples and make_hash_sha256() will also convert the repr() to a base64 encoded SHA256 hash.
import hashlib
import base64
def make_hash_sha256(o):
hasher = hashlib.sha256()
hasher.updat...
MySQL error: key specification without a key length
... TEXT(88) simply won’t work.
The error will also pop up when you try to convert a table column from non-TEXT and non-BLOB type such as VARCHAR and ENUM into TEXT or BLOB type, with the column already been defined as unique constraints or index. The Alter Table SQL command will fail.
The solution...
Spring - @Transactional - What happens in background?
...a way for Spring to inject behaviors before, after, or around method calls into the object being proxied. Transaction management is just one example of the behaviors that can be hooked in. Security checks are another. And you can provide your own, too, for things like logging. So when you annotate a...
Favicon dimensions? [duplicate]
...upport possible. You upload an image and this site gives you the code, the converted images and a browserconfig file.
We could simply upload a favicon manually to our website of 16x16 and it will probably show up in almost any browser.
But when you will mark it as one of your favorites on your s...
Show compose SMS view in Android
...
You can use the following code:
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("sms:"
+ phoneNumber)));
Make sure you set phoneNumber to the phone number that you want to send the message to
You can add a message to the SMS with (from comme...
Which is faster: while(1) or while(2)?
This was an interview question asked by a senior manager.
23 Answers
23
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What is the use of making constructor private in a class?
... @Will: Not if you use reflection. Declaring constructors private is intended to prevent instantiation (barring reflection), but preventing subclassing is a side effect, not the intent. The appropriate tool for this is declaring the class final. This is what Sun did for the String class, and...
python's re: return True if string contains regex pattern
...ord contains bar, baz or bad." Other answers use the behavior of if - auto-converting the expression to its right to a bool. e.g. import re; rgx=re.compile(r'ba[rzd]'); rgx.search('foobar') => <re.Match object; span=(2, 5), match='bar'>, but if(rgx.search(w)): print('y') => y. Closest to...
Optional Parameters in Go?
...ctually receives a slice of whatever type you specify.
func foo(params ...int) {
fmt.Println(len(params))
}
func main() {
foo()
foo(1)
foo(1,2,3)
}
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