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Check if something is (not) in a list in Python
I have a list of tuples in Python , and I have a conditional where I want to take the branch ONLY if the tuple is not in the list (if it is in the list, then I don't want to take the if branch)
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What does enctype='multipart/form-data' mean?
...sible with HTTP requests generated using other means than an HTML form submission. JSON is a common format for use with web services and some still use SOAP.)
The specifics of the formats don't matter to most developers. The important points are:
Never use text/plain.
When you are writing clien...
Max size of an iOS application
What is the maximum size of an iOS application? any constraints?
8 Answers
8
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C++ catch blocks - catch exception by value or reference? [duplicate]
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The standard practice for exceptions in C++ is ...
Throw by value, catch by reference
Catching by value is problematic in the face of inheritance hierarchies. Suppose for your example that there is another type MyException which inherits from CustomException and...
Difference between margin and padding?
What exactly is the difference between margin and padding in CSS? It really doesn't seem to serve much purpose. Could you give me an example of where the differences lie (and why it is important to know the difference)?
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Convert JavaScript string in dot notation into an object reference
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recent note: While I'm flattered that this answer has gotten many upvotes, I am also somewhat horrified. If one needs to convert dot-notation strings like "x.a.b.c" into references, it could (maybe) be a sign that there is something very wrong going on (unless mayb...
Copy constructor for a class with unique_ptr
...rator=( const A& a )
{
up_.reset( new int( *a.up_ ) );
return *this,
}
A& operator=( A&& a )
{
up_ = std::move( a.up_ );
return *this,
}
If you want to use your class in a std::vector, you basically have to decide if the vector shall be the unique owner of an object, i...
How should I cast in VB.NET?
...ightly different, and generally have an acceptable usage.
var.ToString() is going to give you the string representation of an object, regardless of what type it is. Use this if var is not a string already.
CStr(var) is the VB string cast operator. I'm not a VB guy, so I would suggest avoiding it...
What is /dev/null 2>&1?
I found this piece of code in /etc/cron.daily/apf
7 Answers
7
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How should equals and hashcode be implemented when using JPA and Hibernate
...ls and hashcode be implemented in Hibernate? What are the common pitfalls? Is the default implementation good enough for most cases? Is there any sense to use business keys?
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