I have seen member functions programed both inside of the class they belong to and outside of the class with a function prototype inside of the class. I have only ever programmed using the first method, but was wondering if it is better practice to use the other or just personal preference? ...
pthread takes in as its parameter void (start_routine)(void* userPtr), i was hoping i can use std::mem_fun to solve my problem but i cant. I would like to use the function void * threadFunc() and have the userPtr act as the class (userPtr->threadFunc()). Is there a function similar to std::mem_func that i can use? ...
No doubt some of you have seen my recent posting, all regarding the same program. I keep running into problems with it. To reiterate: still learning, not very advanced, don't understand pointers very well, not taking a class, don't understand OOP concepts at all, etc. This code just merges two sorted vectors, farray and sarray, into a si...
It would be exceedingly handy if I could do this: var MyObject = function(param1, param2, ... paramN) { this.var1 = stuff; this.var2 = moreStuff; . . . this.varN = nStuff; this.validate = function() { for(var current in this) { alert(current); //validate all member...
The operators are = () [] -> ->* conversion operators These can be declared only as member functions. Any other operator function can be either a class member or a non-member function. What is the rationale for this restriction? ...
I understand that in the DbC method, preconditions and postconditions are attached to a function. What I'm wondering is if that applies to member functions as well. For instance, assuming I use invariants at the beginning at end of each public function, a member function will look like this: edit: (cleaned up my example) void Charcoa...
Using a trick (described by Olivier Langlois), I can determine whether a class has a type defined: template<typename T> struct hasType { template<typename C> static char test( typename C::Type ); template<typename C> static char* test(...); enum{ Value= sizeof(test<T>(0))==1 }; }; I can also determine whether a class has a...
I've done a bit of reading online as to how to go about this and I think I'm doing it correctly... My goal is to have an array of structure objects that contain pointers to member-functions of a class. Here's what I have so far... typedef void (foo::*HandlerPtr)(...); class foo { public: void someFunc(...); // ... private: ...
Consider the following minimal example: #include <iostream> using namespace std; class myostream : public ostream { public: myostream(ostream const &other) : ostream(other.rdbuf()) { } }; int main() { cout << "hello world" << endl; myostream s(cout); s << "hello world" << endl; myostr...
class foo implements Countable { function count() { # do stuff here } } What's the type of count,public,protect or private? ...
I'm reading Thinking in C++ by Bruce Eckel. In Chapter 15 (Volume 1) under the heading "Behaviour of virtual functions inside constructor", he goes What happens if you’re inside a constructor and you call a virtual function? Inside an ordinary member function you can imagine what will happen – the virtual call is resolved a...
Rarely in the regular codes I encounter the a single colon in classes for e.g.: A::member():b(),c() { } What is the importance of the single colon over here? Why is it used here? Is it mandatory sometimes? If so in which cases? ...
Ok, so I know that technically this is undefined behavior, but nonetheless, I've seen this more than once in production code. And please correct me if I'm wrong, but I've also heard that some people use this "feature" as a somewhat legitimate substitute for a lacking aspect of the current C++ standard, namely, the inability to obtain the...
I am reluctant to say I can't figure this out, but I can't figure this out. I've googled and searched Stack Overflow, and come up empty. The abstract, and possibly overly vague form of the question is, how can I use the traits-pattern to instantiate member functions? [Update: I used the wrong term here. It should be "policies" rather ...
I'll use the following (trivial) interface as an example: struct IObject { virtual ~IObject() {} virtual std::string GetName() const = 0; virtual void ChangeState() = 0; }; Logic dictates that GetName should be a const member function while ChangeState shouldn't. All code that I've seen so far doesn't follow this logic, though...
Hi I have problem with calling for my procedure. Oracle scrams PLS-00306 Error: Wrong number of types of arguments in call to procedure. With my type declaration procedure has exact the same declaration like in header below. If I run it as separate procedure it works, when i work in ODCI interface for extensible index creation, i...
Is there a way to extract member functions, and use them as F# functions? I'd like to be able to write the following: mystring |> string.Split '\n' |> Array.filter (string.Length >> (=) 0 >> not) The code above works if you [let] let mystring = "a c\nb\n" let stringSplit (y:char) (x:string) = x.Split(y) let stringLength (x:string) = ...
DEAR All; Hi, I'm just beginner to C++; Please help me to understand: What functions should be in the Linked list class ? I think there should be overloaded operators << and >>; Please help me to improve the code (style, errors, etc,) Thanks for advance. Igal. Edit: This is only first sta...
Let's say I have the following object: struct Foo { int size() { return 2; } }; What's the best way (most maintainable, readable, etc.) to get the total size of all objects in a vector<Foo>? I'll post my solution but I'm interested in better ideas. Update: So far we have: std::accumulate and a functor std::accumulate and a la...
Given the following code: class Screen; class WindowMgr { WindowMgr& relocateScreen( int r, int c, Screen& s); }; class Screen { friend WindowMgr& WindowMgr::relocateScreen( int r, int c, Screen& s); // ^ cannot access private member declared in class 'WindowMgr' int m_nR, m_nC; }; WindowMgr& WindowMgr::reloc...