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  • python return class

    - by William P
    Hi I new to python and I read from someone else of the example code below: class A: def current(self): data = Data(a=a,b=b,c=c) return data class B(A): #something here #print data a b c How do I print out the data a, b, and c?

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  • Basic Custom String Class for C++

    - by wdow88
    Hey all, I'm working on building my own string class with very basic functionality. I am having difficulty understand what is going on with the basic class that I have define, and believe there is some sort of error dealing with the scope occurring. When I try to view the objects I created, all the fields are described as (obviously bad pointer). Also, if I make the data fields public or build an accessor method, the program crashes. For some reason the pointer for the object is 0xccccccccc which points to no where. How can a I fix this? Any help/comments are much appreciated. //This is a custom string class, so far the only functions are //constructing and appending #include<iostream> using namespace std; class MyString1 { public: MyString1() { //no arg constructor char *string; string = new char[0]; string[0] ='\0'; std::cout << string; size = 1; } //constructor receives pointer to character array MyString1(char* chars) { int index = 0; //Determine the length of the array while (chars[index] != NULL) index++; //Allocate dynamic memory on the heap char *string; string = new char[index+1]; //Copy the contents of the array pointed by chars into string, the char array of the object for (int ii = 0; ii < index; ii++) string[ii] = chars[ii]; string[index+1] = '\0'; size = index+1; } MyString1 append(MyString1 s) { //determine new size of the appended array and allocate memory int newsize = s.size + size; MyString1 MyString2; char *newstring; newstring = new char[newsize+1]; int index = 0; //load the first string into the array while (string[index] != NULL) { newstring[index] = string[index]; index++; } //load the second string while (s.string[index] != NULL) { newstring[index] = s.string[index]; index++; } //null terminate newstring[newsize+1] = '\0'; delete string; //generate the object for return MyString2.string=newstring; MyString2.size=newsize; return MyString2; } private: char *string; int size; }; int main() { MyString1 string1; MyString1 string2("Hello There"); MyString1 string3("Buddy"); string2.append(string3); return 0; }

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  • Java Enum List from Class

    - by DD
    How do I go from a Class object to a list of enums generically? i.e. public static <T extends Enum> List<T> getList(Class<T> clazz) I cant find a way to get to the values() method

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  • class foo; in header file

    - by Thomas
    Hi, Is some one able to explain why header files have something like this? class foo; // This here? class bar { bar(); }; Do you need an include statement when using this? Thanks.

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  • Can't see how to compile a header file with /clr switch in a mixed class

    - by MattN
    When creating a mixed mode class, on compilation the header file complains that it needs to be complied with the /clr switch as it is a mixed mode class, however, I can't see any option to specifically compile that header with /clr from visual studio, and I don't want to set the entire project with a /clr flag, Does anyone know how I can specify that this header file is compiled correctly with /clr? Thanks in advance!

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  • parameter extends a class

    - by coubeatczech
    Hello, I want to do a class thats accepts anything ordered and prints greater. (I'm just learning so I know it's a bit useless) class PrinterOfGreater[T extends Ordered](val a:T, val b:T){println(a > b)} I know that it can't be written by this style in scala, but I don't know how to write it properly... Do anybody know?

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  • row specific class

    - by stimpie
    How do I create a Zend_Db_Table which returns a different class for each row.? Example UserTable has id,name and type Type contains class names (admin,client,etc...) The classes admin, client are all subclasses of user If I call fetch I need to get a admin or client object depending on the corresponding value in the db.

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  • Declaring variable as PHP class

    - by iamdadude
    I have a variable called $theclass and it's a string "Home_class". How can I define a class out of that string? The reason I need to do this is that the variable will change and I want to be able to declare the class that the variable is equal to. Is this possible? Thanks for any help.

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  • real time scenario between interface/abstract class ?

    - by JavaUser
    Hi , Please give me a real time simple example for the below questions : Where to use interface rather abstract class Where to use abstract class rather interface I need code snippet for both . Which takes low memory and which performs well . Do I need to consider the design aspect also? What is the conceptual difference not the syntactical difference .

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  • Scaffold is ignoring class file in CakePHP

    - by JoseMarmolejos
    Hi, when using scaffolding on a controller the views render fine and the app even attempts to insert the data; the problem is that the scaffold is completely ignoring the relations I'm defining in my model class, in fact it's ignoring the class entirely as I can delete the file and the controller still scaffolds and render the crud from the table. Has this ever happened to you?

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  • Casting of object for a class loaded at runtime

    - by Steven
    hi, i load a class using Class.forName(klassname,false,loader) After this i create an instance using klass.newInstance(); It returns an object type.I want to cast it to specific type(ie.Klassnamw instance).I used normal casting but it gets hung because it is not resolved during runtime.How can i cast it?Hellp

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  • Log4net: seperate log files for each class

    - by Mohsan
    hi.. i want to log messages from multiple classes. the problem is that currently i can log all messages into single file.i want to do this class A should log its messages into ALog.txt and class B should log its messages into BLog.txt please tell me the sample config file for these settings

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  • Android: R$id class not loaded?

    - by llappall
    Hi, I have a Android class extending Application to generate some global classes, etc. It works, in that I can, for example, get the context, etc. BUT, when I try this: row = (TextView) findViewById(R.id.list_row_text); I get R.id.list_row_text = Class not loaded : <mypackage>.R$id Any ideas why this is happening? Thanks Gerardo

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  • Get default value of class member ( C# )

    - by Ruben Aster
    Let's assume I have a class ClassWithMember class ClassWithMember { int myIntMember = 10; } How do I get the default value 10 of the myIntMember member by System.Type? I'm currently struggling around with reflections by all I retreive is the default value of int (0) not the classes default member (10)..

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  • Ruby: Alter class static method in a code block

    - by Phuong Nguy?n
    Given the Thread class with it current method. Now inside a test, I want to do this: def test_alter_current_thread Thread.current = a_stubbed_method # do something that involve the work of Thread.current Thread.current = default_thread_current end Basically, I want to alter the method of a class inside a test method and recover it after that. I know it sound complex for another language, like Java & C# (in Java, only powerful mock framework can do it). But it's ruby and I hope such nasty stuff would be available

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  • implementing java interface with scala class - type issue

    - by paintcan
    Why on earth won't this compile? Scala 2.8.0RC3: Java public interface X { void logClick(long ts, int cId, String s, double c); } Scala class Y extends X { def logClick(ts: Long, cId: Int,sid: java.lang.String,c: Double) : Unit = { ... } } Error class Y needs to be abstract, since method logClick in trait X of type (ts: Long,cId: Int,s: java.lang.String,c: Double)Unit is not defined

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  • Class constructor in java

    - by aladine
    Please advise me the difference between two ways of declaration of java constructor public class A{ private static A instance = new A(); public static A getInstance() { return instance; } public static void main(String[] args) { A a= A.getInstance(); } } AND public class B{ public B(){}; public static void main(String[] args) { B b= new B(); } } Thanks

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