Can I use operators as function callback in PHP?
Suppose I've the following function: function mul() { return array_reduce(func_get_args(), '*'); } Is is possible to use the * operator as a callback function? Is there any other way? ...
operators
What is the difference between ~ and ! operator?
Please let me know the difference between ~ and ! operator in java. ...
Unary operator result
In K&R ANSI C book, section A.7.4.5 (Unary Minus Operator) it is stated: ... The negative of an unsigned quantity is computed by subtracting the promoted value from the largest value of the promoted type and adding one; ... How exactly is this calculated? Could you give a short C example? I don't see how this could yield the negati...
Which C++ logical operators do you use: and, or, not and the ilk or C style operators? why?
leisure/curiosity question as implied in the title. I personally prefer the new operators as to make code more readable in my opinion. Which ones do use yourself? What is your reason for choosing one over the other one? also Emacs highlights those operators differently so I get more visual feedback when looking at the screen. I know...
CompilerServices.Operators equivalent on C#
Hello, I want to know if exists namespace available for C#, cause this class come from : Microsoft.VisualBasic.CompilerServices cause I want to do something like this, but in C#: Dim m = GetType(CompilerServices.Operators).GetMethod("LikeString") Thanks ...
Speed difference: separate functor VS operator() inside a big class with *this
I'm using the c++ STL heap algorithms, and I wrote a wrapper class around it so I could do some other stuff. When I tried to use the code below, for example: //! Min-heap wrapper class. class FMMHeap{ public: FMMHeap(Vector &phi) : _phi(phi) {} bool operator()(unsigned p1, unsigned p2) {return fabs(_phi(p1)) > fabs(_phi(p2)); }...
Common way to call mother-class operator= in C++?
Let's suppose I have a class Dog that inherits from class Animal, you might want to insert a call to Animal::operator= in Dog::operator=. What is the most readable/common way to write it? I think I know those two... static_cast<Animal*>(this)->operator=(other); and this->Animal::operator=(other); ...
VB to C# Functions
Which are the equivalent of the following operators from VB.Net to C#? UBound() LBound() IsNothing() Chr() Len() UCase() LCase() Left() Right() RTrim() LTrim() Trim() Mid() Replace() Split() Join() MsgBox() IIF() ...
SQL "*=" operator
Possible Duplicate: Transact-SQL shorthand join syntax? I ran across a T-SQL script that does something like this in the where clause: ... where o.obj_code *= c.prv_code I can't seem to find any documentation on the *= operator. Can anyone explain its use and maybe point to some documentation on it? Is this specific to T-SQ...
PHP Comparison Operators and Data Types
I'm currently working through O'Reilly's "Programming PHP" and have come across this table titled "Type of comparison performed by the comparison operators": First Operand | Second Operand | Comparison ----------------------------------------------------------------------- Number | Number ...
Bitwise Operation and Usage
x = 1 # 0001 x << 2 # Shift left 2 bits: 0100 # Result: 4 x | 2 # Bitwise OR: 0011 # Result: 3 x & 1 # Bitwise AND: 0001 # Result: 1 I can understand the arithmetic operators in Python (and other langs), but I never understood 'bitwise' operators quite well. In the above example (from a Python book), I und...
Javascript String Assignment Operators
How come I can use += on a string, but I cannot use -= on it? For example... var test = "Test"; var arr = "⇔" test += arr; alert(test); // Shows "Test⇔" test -= arr; alert(test); // Shows "NaN" ...
What's the difference between ++$i and $i++ in PHP?
What's the difference between ++$i and $i++ in PHP? ...
Is there an Non-Short circuited logical "and" in C++?
tl;dr: Is there a non-short circuit logical AND in C++ (similar to &&)? I've got 2 functions that I want to call, and use the return values to figure out the return value of a 3rd composite function. The issue is that I always want both functions to evaluate (as they output log information about the state of the system) IE: bool Func...
templated operator() overload C++
someone already asked this question, but the thread ended up with the original question not getting answered. suppose you have this: template<size_t i, class f_type> void call_with_i(f_type f); functor_type is either: a) a struct with a method that has the following signature: template<size_t i> operator()() const; or, b) a fun...
Equality Test for Derived Classes in C++
Possible Duplicate: Whats the right way to overload operator== for a class hierarchy? In C++, how can derived classes override the base class equality test in a meaningful way? For example, say I have a base class A. Classes B and C derive from A. Now given two pointers to two A objects, can I test if they are equal (including ...
Declaring functors for comparison ??
Hello, I have seen other people questions but found none that applied to what I'm trying to achieve here. I'm trying to sort Entities via my EntityManager class using std::sort and a std::vector<Entity *> /*Entity.h*/ class Entity { public: float x,y; }; struct compareByX{ bool operator()(const GameEntity &a, const GameEntity &b) {...
Reference assignment operator in php =&
I am having a hard time determining what the =& (equals-ampersand) assignment operator does in PHP. Can anyone explain it? Is it deprecated? Thanks! ...
What's the -> operator in Prolog and how can I use it?
I've read about it in a book but it wasn't explained at all. I also never saw it in a program. Is part of Prolog syntax? What's it for? Do you use it? Thanks ...
Using is operator with Interface to Generics
I have a few generic classes that implement a common non-generic interface. I create my generic objects and add them to a list. How can I use LINQ, or any other method for that matter, to filter the list by the generic type. I do not need to know T at run-time. I added a type property to the interface and used LINQ to filter by it but I ...