Is it possible to define operators for enums? For example I have enum Month in my class and I would like to be able to write ++my_month. Thanks P.S. In order to avoid overflowing I did something like this: void Date::add_month() { switch(my_month_) { case Dec: my_month_ = Jan; add_year(); break; ...
In, PHP, what is the "->" operator called and how do you say it when reading code out loud? ...
TL;DR: I use PHP inside an external stylesheet, but it doesnt recognize the '/' as a PHP divider operator, this messes up my css any help is appreciated OK so here's the deal. I'm working on a simple website (I'm an intern, the assignment is not that hard, but i want to do it right) which loads the menu items dynamically from a page t...
It seems that these two operators are pretty much the same - is there a difference? When should I use = and when ==? ...
Hi! What does this meaning mean in words? (SomeVariable * 330UL >> 10) Is it: SomeVariable times 3.3 shift right 10 bit?? Kind regards! ...
I have a quick question about the mod operator. I know what it does; it calculates the remainder of a division. My question is, how can I identify a situation where I would need to use the mod operator? I know I can use the mod operator to see whether a number is even or odd and prime or composite, but that's about it. I don't often thin...
In C++, I can change the operator on a specific class by doing something like this: MyClass::operator==/*Or some other operator such as =, >, etc.*/(Const MyClass rhs) { /* Do Stuff*/; } But with there being no classes (built in by default) in C. So, how could I do operator overloading for just general functions? For example, if...
Could anyone help me to understand following line of code: sol< ?=f((1<< n)-1,i,0)+abs(P[i])*price; I am studying an algorithm written using c++ and it has following operator < ?= . My problem is with understanding < ?= operator. Also when I compile this code using g++ compiler , it gives error message for above line of code line of c...
hi. In numerical oriented languages (Matlab, Fortran) range operator and semantics is very handy when working with multidimensional data. For example: A(i:j,k,:n) // represents two-dimensional slice B(i:j,0:n) of A at index k unfortunately C++ does not have range operator (:). of course it can be emulated using range/slice functor, b...
I have several members in my class which are const and can therefore only be initialised via the initialiser list like so: class MyItemT { public: MyItemT(const MyPacketT& aMyPacket, const MyInfoT& aMyInfo) : mMyPacket(aMyPacket), mMyInfo(aMyInfo) { } private: const MyPacketT mMyPacket; const MyInf...
Why is the following syntax correct: x = y+++y; Where it means y++ + y or y + ++y which means y * 2 + 1 (not sure about this, though: very ambiguous) But this syntax is incorrect: x = y+++++y; Which should mean y++ + ++y, which means y * 2 + 2 Is there a reason for the incorrectness of this syntax? (Edit: thank you for ex...
Hi, Im holding an iterator that points to an element of a vector, and I would like to compare it to the next element of the vector. Here is what I have Class Point{ public: float x,y; } //Somewhere in my code I do this vector<Point> points = line.getPoints(); foo (points.begin(),points.end()); where foo is: void foo (Vector<Poi...
Let's say I have a first structure like this: typedef struct { int ivalue; char cvalue; } Foo; And a second one: typedef struct { int ivalue; char cvalue; unsigned char some_data_block[0xFF]; } Bar; Now let's say I do the following: Foo *pfoo; Bar *pbar; pbar = new Bar; pfoo = (Foo *)pbar; delete pfoo; ...
I would like to define an abstract base class X and enforce the following: a) every concrete class Y that inherits from X define a constructor Y(int x) b) it should be possible to test whether two Y objects are equal. For a, one not very good solution is to put a pure virtual fromInt method in X which concrete class will have to defi...
I have a collection of Post objects and I want to be able to sort them based on these conditions: First, by category (news, events, labs, portfolio, etc.) Then by date, if date, or by position, if a specific index was set for it Some posts will have dates (news and events), others will have explicit positions (labs, and portfolio). ...
Who can give me a link for the operator= of vector in MSDN? Why I can only find operator[]? If operator= is just something default, like copy everything in A to B, how this following code works? vector<double> v(100,1); v = vector<double>(200,2); // if operator= is just a trivail version, how to make sure the old v get cleared? ...
What are XAND and XOR? Also is there an XNot ...
The following code fails to compile #include <iostream> #include <cmath> #include <complex> using namespace std; int main(void) { const double b=3; complex <double> i(0, 1), comp; comp = b*i; comp = 3*i; return 0; } with error: no match for ‘operator*’ in ‘3 * i’ What is wrong here, why cannot I multiply w...
I have the following code and I can't understand what does it mean: var1 |= var2>0 ? 1 : 2; Anyone can help me please! ...
How can we implement the modulo operator as a function in C without using the operator? ...