Scala @ operator
What does scala @ operator do? For example at this page there is a something like this case x @ Some(Nil) => x ...
operators
What does it means in C# : using -= operator by events?
When must we use this operator by events? What is its usage? ...
When must we use checked operator in C#?
When must we use checked operator in C#? Is it only suitable for exception handling? ...
When must we use implicit and explicit operators in C#?
What is the usage of these operators? ...
IS NOT operator in c#
Hello, Question from beginner, can't find "is not" operator in C#. For example I have code below which do not work, I need to check is err not from class ThreadAbortException. catch (Exception err) { if (err is not ThreadAbortException) { } } Regards, Tomas ...
Why is ''>0 True in Python?
In Python 2.6.4: >> ''>0 True Why is that? ...
undefined C/C++ symbol as operator
I notice that the character/symbol '`' and '@' is not used as an operator in C/C++, does anyone know the reason or historically why its so? if its really not used, is it safe to define those symbols as another operator/statement using #define? ...
C++ and,or,not,xor keywords
Possible Duplicate: The written versions of the logical operators. I notice that C++ define keyword and, or, not, xor, and_eq, or_eq, not_eq and xor_eq as an alternative to &&, ||, !, ^, &=, |=, != and |=. and they're rarely used! What's wrong? Are they not portable? ...
C++ overloading operator comma for variadic arguments
is it possible to construct variadic arguments for function by overloading operator comma of the argument? i want to see an example how to do so.., maybe something like this: template <typename T> class ArgList { public: ArgList(const T& a); ArgList<T>& operator,(const T& a,const T& b); } //declaration void myFunction(ArgList<in...
__rlshift__, __ror__ in Python
I noticed that this recipe seems to use __rlshift__, __ror__ like operators. But, they aren't in the documentation! Can anyone explain these and perhaps point to some docs? ...
C++ overide global operator comma gives error
the second function gives error C2803 http://msdn.microsoft.com/en-us/library/zy7kx46x%28VS.80%29.aspx : 'operator ,' must have at least one formal parameter of class type. any clue? template<class T,class A = std::allocator<T>> class Sequence : public std::vector<T,A> { public: Sequence<T,A>& operator,(const T& a) { this-...
Is there a way to add methods to GregorianCalendar in Java?
I'd like to make a method called "isBetween" returning a boolean, seeing if a GregorianCalendar date falls between two others. Alternatively, I'd like to just define operators of < and > for the class. I'm pretty new to Java, so I'm not sure....can I even do either of those? If so, how? ...
bash: $[<arithmetic-expression>] vs. $((<arithmetic-expression>))
I have just stumbled upon the bash syntax: foo=42 bar=$[foo+1] # evaluates an arithmetic expression When I Googled for this, I found http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_03_04.html#sect_03_04_05: 3.4.6. Arithmetic expansion Arithmetic expansion allows the evaluation of an arithmetic expression and the substitut...
Php plugin to replace '->' with '.' as the member access operator ? Or even better: alternative syntax ? (<php+ $obj.i = 5 ?>)
Present day usable solution: Note that if you use an ide or an advanced editor, you could make a code template, or record a macro that inserts '->' when you press Ctrl and '.' or something. Netbeans has macros, and I have recorded a macro for this, and I like it a lot :) (just click the red circle toolbar button (start record macro),t...
Why is Decimal('0') > 9999.0 True in Python?
This is somehow related to my question Why is ''>0 True in Python? In Python 2.6.4: >> Decimal('0') > 9999.0 True From the answer to my original question I understand that when comparing objects of different types in Python 2.x the types are ordered by their name. But in this case: >> type(Decimal('0')).__name__ > type(9999.0).__nam...
operator inside operator not working........
char b; operator<<(cout,(operator>>(cin,b))); this is not compiling in vc++ because all 8 overloads cant convert this type. can any one explain this..... is their a problem with return type........... ...
Polynomial division overloading operator (solved)
Ok. here's the operations i successfully code so far thank's to your help: Adittion: polinom operator+(const polinom& P) const { polinom Result; constIter i = poly.begin(), j = P.poly.begin(); while (i != poly.end() && j != P.poly.end()) { //logic while both iterators are valid if (i->pow > j->pow) { //if the cu...
How to pass multiple different records (not class due to delphi limitations) to a function?
Hi to all. I have a number of records I cannot convert to classes due to Delphi limitation (all of them uses class operators to implement comparisons). But I have to pass to store them in a class not knowing which record type I'm using. Something like this: type R1 = record begin x :Mytype; class operator Equal(a,b:R1) end; type ...
Const operator overloading problems in C++
I'm having trouble with overloading operator() with a const version: #include <iostream> #include <vector> using namespace std; class Matrix { public: Matrix(int m, int n) { vector<double> tmp(m, 0.0); data.resize(n, tmp); } ~Matrix() { } const double & operator()(int ii, int jj) const { cout ...
^= operator in vb.net (Xor Equals)?
Is there an equivalent in VB.NET to the C# ^= operator? ...