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Questions tagged [initialization]

Initialization deals with the task of initializing the contents of your data structure. It's a common practice in statically-typed languages.

Initialization deals with the task of initializing the contents of data structures. This is the initialization of an object, structure, blob of data, or any entity which contains state that must be prepared prior to usage of the entity.

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When do I have to use initializer lists for initializing C++ class members?

let's say I have std::map< std::string, std::string > m_someMap as a private member variable of class A Two questions: (and the only reason I'm asking is because I came across code like that) What's the purpose of this line: A::A() :…
Tom
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How to initialize a class?

The problem is really simple, I have a class "Stock", I want to load its property "StockName", "StockCode' from the db. so which patten should I use? pattern 1) Use service class to create it public interface IStockService{ Stock…
yi.
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1l for long, 1f for float, 1d for double, what about byte?

1l for long, 1f for float, 1d for double, what about byte? long l = 1l; float f = 1f; double d = 1d; // byte b = 1?; What's the equivalent for byte? Does it exist?
sp00m
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uninitialized constant when using module in custom initializer

I'm working on a Rails (3.2) app and I need to execute some tasks when the app boots. Since I want to keep the logic in a separate file I have also create lib/helinium.rb that looks like (with dummy run method) class Helinium def self.run puts…
Sig
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Default value for struct parameter

Let's say I have the following struct: struct myStruct { int x; int y; int z; int w; }; I want to initialize this struct to a default value when calling the following function. If it helps I'm looking for a simple zero initialization. void…
atoMerz
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Simple program using uniform initialization to construct an object fails to compile

Consider the following program: struct X { X(int, int) { } X(X&&) { } }; int main() { X x( {0, 1} ); // Doesn't compile on ICC 13.0.1, compiles on // Clang 3.2, GCC 4.7.2, and GCC 4.8.0 beta. } When compiled with GCC…
Andy Prowl
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Python Instantiate Class Within Class Definition

I am attempting to add a variable to a class that holds instances to the class. The following is a shortened version of my code. class Classy : def __init__(self) : self.hi = "HI!" # "CLASSIES" variable holds instances of class…
Tanaki
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initialize struct contain references to structs

Is it possible to have a struct containing references to structs. And how are these initialized? See short example below. Thanks typedef struct { int a; }typeInner1; typedef struct { int b; }typeInner2; typedef struct { typeInner1 &one; …
monkeyking
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When are C++ implicit types initialized to 0?

I grew some doubts after discussing this with colleagues... As the title asks, when can it be assumed that built-in types will be initialized to 0 instead of an unknown value? Do the rules vary among the c++ standards?
Drew Dormann
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Inherited const attribute and initialization (bug?)

I've been surprised that this code is actually considered correct (gcc 4.2.1) : class A { public: const int i; }; class B: public A { public: //B() {} }; so that I am able to let some attribute non initialized. The compiler complains when I try…
Jean-Baptiste Yunès
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Zero initialization of POD

struct Line { Bounds bounds_; Vector origin_; uint32_t begin_; uint32_t end_; dist ascent_; dist descent_; }; which is used as follows: Line line = {}; while…
Daniel Gehriger
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Python __init__ setattr on arguments?

It seems that often __init__ methods are similar to this: def __init__(self, ivar1, ivar2, ivar3): self.ivar1 = ivar1 self.ivar2 = ivar2 self.ivar3 = ivar3 Is there someway to turn the arguments into a list (without resorting to *args…
mk12
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Is it possible to create an instance of an class without running ANY code from the class? (no ctor, no field initializations)

I have created an engine that takes in 3rd party plugins (DLL's) that implement an interface. Since I have no control over the code that gets plugged in, I want to be able to run 1 specific method (from the interface) from the correct class…
Wolf5
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How to initialize char array in struct

how to initialize a char array in structure in C# i am doing this struct cell { public char[] domain =new char[16]; public int[] Peers; public int NumberOfPeers; public char assignValue; } but its giving error that we cannot…
ssbb
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What is the difference between declaring data attributes inside or outside __init__

Possible Duplicate: Python: Difference between class and instance attributes I'm trying to get my head around OOP in Python and I'm a bit confused when it comes to declare variables within a class. Should I declare them inside of the __init__…
David Martinez
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