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  • Behavior of virtual function in C++

    - by Summer_More_More_Tea
    Hi everyone: I have a question, here are two class below: class Base{ public: virtual void toString(); // generic implementation } class Derive : public Base{ public: ( virtual ) void toString(); // specific implementation } The question is: If I wanna subclass of class Derive perform polymophism using a pointer of type Base, is keyword virtual in the bracket necessary? If the answer is no, what's the difference between member function toString of class Derive with and without virtual?

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  • Checkbox Styling with SelectAll Function

    - by Wilson
    Was styling the checkboxes of my webpage with jquery using the tutorial here But i realized that I could not do SelectAll checkbox that will select all the checkboxes in my list. It works in the backend (the checkboxes are selected) but it does not show in my page. Added a demo to show my problem. May need to port to your system to test it out Demo what can I add to the jQuery Custom Radio-buttons and Checkbox javascript file in the to achieve the select all checkbox function Thank you!

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  • java dynamic function calling

    - by dpaksp
    here is that case....i have an String array that contains only method names of yyyyyy.java file in xxxxxx.java file am creaing yyyyyy.java 's instance (say obj) now i have access obj.fuction_name....that function i should get from that String array in loop ...is that possible ... thank u

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  • virtaul function

    - by hitech
    class a { virtual void foo(void) ; }; class b : public a { public: virtual void foo(void) { cout<< "class b"; } }; int main ( ) { class a *b_ptr = new b ; b_ptr-foo(); } please guide me why the b_ptr-foo() will not call the foo() function of the class b?

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  • regarding C++ stl container swap function

    - by sm1
    I recently learned that all stl containers have swap function: i.e. c1.swap(c2); will lead to object underlying c1 being assigned to c2 and vice versa. I asked my professor if same is true in case of c1 and c2 being references. he said same mechanism is followed. I wonder how it happens since c++ references cannot be reseted.

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  • Exact cin equivalent function in python

    - by gkt.pro
    Suppose user enter this string at terminal 123 456 456 //then hit enter How do I scan these three (could be more) numbers in different variables in python Could be something like this: for i in range(1,n) m[i]=#WHAT FUNCTION SHOULD I PUT HERE In c++ we can easily use cin>>m[i] inside above loop to scan the variables. If i use input() or raw_input() , they would scan whole line in single variable.

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  • C++: Pass array created in the function call line

    - by Jarx
    How can I achieve a result like somebody would expect it according to the following code example: // assuming: void myFunction( int* arr ); myFunction( [ 123, 456, 789 ] ); // as syntactical sugar for... int values[] = { 123, 456, 789 }; myFunction( values ); The syntax I thought would work spit out a compile error. How can I define an argument array directly in the line where the function is called?

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  • TextMate can show definition of a function easily?

    - by Jian Lin
    I am using TextMate on a Ruby on Rails project and wonder if you can put the mouse on link_to, and then press a key and it will show the definition of link_to, or does this for any other helper functions? Or, click open a box and type in a function name and it will show you the definition?

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  • Trigger function on deserialization

    - by Tom Savage
    I have a class with a number of fields which are normally calculated in the constructor from other data in the class. They are not serialized to XML because any changes to the rest of the data will likely require their recalculation. Is there a way I can set up a function call to be triggered on deserialization?

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  • document.evalute function giving exception

    - by R_Dhorawat
    i have a code like res = doc.evalute(xpathExpr,doc,function(prefix) { return namespaces[prefix] || null;}, XPathResult.ANY_TYPE,null ); here doc is DOM document node when i run for loop like this for(i in doc)alert(i); it gives evalute method but when i tried to use this method on dom node it giving me error like xpathResult not defined... i'm working in android browser thanks in advance....

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  • Malloc function in C++

    - by Mohit Deshpande
    I am transitioning to C++ from C. In C++, is there any use for the malloc function? Or can I just declare it with the "new" keyword. For example: class Node { ... } ... Node *node1 = malloc(sizeof(Node)); //malloc Node *node2 = new Node; //new Which one should I use?

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  • Jquery multiple events to trigger the same function

    - by dweebsonduty
    Is there a way to have keyup, keypress, blur, and change events call the same function in one line or do I have to do them separately? The problem I have is that I need to validate some data with a db lookup and would like to make sure that there is no way that the validation is missed weather it is typed or pasted into the box.

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  • How to implement Chord function using GDIplus?

    - by leo4ever
    Here are the GDI functions Chord() provided by MFC: BOOL Chord( int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4 ); BOOL Chord( LPCRECT lpRect, POINT ptStart, POINT ptEnd ); It seems to me that no such method is privided by GDI+ (the Graphics class), so how do I implement my own Chord function (with the exact same prototype) ? By the way, I just don't understand why does MS just don't provide them. Thanks.

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