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Python circular importing?
...Y.py, the compiler hits the import statement before it defines Y2. Then it starts compiling X.py. Soon it hits the import statement in X.py that requires Y2. But Y2 is undefined, so the compile fails.
Please note that if you modify X.py to import Y1, the compile will always succeed, no matter whic...
MySQL ON vs USING?
...city.city BETWEEN 'C' AND 'E' will list all countries but just the cities starting with C or D (if any). (Plus towns called 'E')
– Roemer
Jun 12 at 18:04
...
Configuring Log4j Loggers Programmatically
...
Logger.getRootLogger().getLoggerRepository().resetConfiguration();
and start with adding your own. You need log4j in the classpath of course for this to work.
Remark:
You can take any Logger.getLogger(...) you like to add appenders. I just took the root logger because it is at the bottom of all...
Is a Python list guaranteed to have its elements stay in the order they are inserted in?
...if you are not careful (and indeed, this does happen to everyone when they start programming in Python in some way or another; just search this site for "modifying a list while looping through it" to see dozens of examples).
It's also worth pointing out that x = x + [a] and x.append(a) are not the...
Is it safe to remove selected keys from map within a range loop?
...al"
"os"
"math/rand"
"time"
)
func main() {
log.Info("=== START ===")
defer func() { log.Info("=== DONE ===") }()
go func() {
m := make(map[string]string)
for {
k := GenerateRandStr(1024)
m[k] = GenerateRandStr(1024*1024)
...
Setting PayPal return URL and making it auto return?
This is a follow up question to: PHP: Easy way to start PayPal checkout?
6 Answers
6
...
Wrap a delegate in an IEqualityComparer
...1862076501
x: 1573781440
x: 646797592
x: 655632802
x: 1206819377
Yeah... starting to make sense?
Hopefully from these examples it's clear why including an appropriate GetHashCode in any IEqualityComparer<T> implementation is so important.
Original answer
Expanding on orip's answer:
The...
How do pointer to pointers work in C?
...--+----+
What you can see here, is that at address 63 the string "hello" starts. So in this case, if this is the only occurrence of "hello" in memory then,
const char *c = "hello";
... defines c to be a pointer to the (read-only) string "hello", and thus contains the value 63. c must itself be ...
The difference between fork(), vfork(), exec() and clone()
...t, this system call can be used to create all kinds of execution entities, starting from threads and finishing by completely independent processes. In fact, clone() system call is the base which is used for the implementation of pthread_create() and all the family of the fork() system calls.
exec() ...
How does `is_base_of` work?
...
Let's work out how it works by looking at the steps.
Start with the sizeof(check(Host<B,D>(), int())) part. The compiler can quickly see that this check(...) is a function call expression, so it needs to do overload resolution on check. There are two candidate overloads a...