How do you implement the Singleton design pattern?
Recently I've bumped into a realization/implementation of the Singleton design pattern for C++. It has looked like this (I have adopted it from the real-life example):// a lot of methods are omitted...
View ArticleAnswer by Reed Copsey for How do you implement the Singleton design pattern?
Being a Singleton, you usually do not want it to be destructed.It will get torn down and deallocated when the program terminates, which is the normal, desired behavior for a singleton. If you want to...
View ArticleAnswer by Cătălin Pitiș for How do you implement the Singleton design pattern?
You could avoid memory allocation. There are many variants, all having problems in case of multithreading environment.I prefer this kind of implementation (actually, it is not correctly said I prefer,...
View ArticleAnswer by T.E.D. for How do you implement the Singleton design pattern?
It is indeed probably allocated from the heap, but without the sources there is no way of knowing.The typical implementation (taken from some code I have in emacs already) would be:Singleton *...
View ArticleAnswer by James Hopkin for How do you implement the Singleton design pattern?
Another non-allocating alternative: create a singleton, say of class C, as you need it:singleton<C>()usingtemplate <class X>X& singleton(){ static X x; return x;}Neither this nor...
View ArticleAnswer by Martin York for How do you implement the Singleton design pattern?
In 2008 I provided a C++98 implementation of the Singleton design pattern that is lazy-evaluated, guaranteed-destruction, not-technically-thread-safe:Can any one provide me a sample of Singleton in...
View ArticleAnswer by SadSido for How do you implement the Singleton design pattern?
The solution in the accepted answer has a significant drawback - the destructor for the singleton is called after the control leaves the main() function. There may be problems really, when some...
View ArticleAnswer by baris.aydinoz for How do you implement the Singleton design pattern?
This is about object life-time management. Suppose you have more than singletons in your software. And they depend on Logger singleton. During application destruction, suppose another singleton object...
View ArticleAnswer by sdfsdaf for How do you implement the Singleton design pattern?
The paper that was linked to above describes the shortcoming of double checked locking is that the compiler may allocate the memory for the object and set a pointer to the address of the allocated...
View ArticleAnswer by riderchap for How do you implement the Singleton design pattern?
If you want to allocate the object in heap, why don't use a unique pointer. Memory will also be deallocated since we are using a unique pointer.class S{ public: static S& getInstance() { if(...
View ArticleAnswer by Gank for How do you implement the Singleton design pattern?
#define INS(c) private:void operator=(c const&){};public:static c& I(){static c _instance;return _instance;}Example: class CCtrl { private: CCtrl(void); virtual ~CCtrl(void); public: INS(CCtrl);
View ArticleAnswer by Tunvir Rahman Tusher for How do you implement the Singleton design...
Here is an easy implementation.#include <Windows.h>#include <iostream>using namespace std;class SingletonClass {public: static SingletonClass* getInstance() { return (!m_instanceSingleton)...
View ArticleAnswer by dan-man for How do you implement the Singleton design pattern?
In addition to the other discussion here, it may be worth noting that you can have global-ness, without limiting usage to one instance. For example, consider the case of reference counting...
View ArticleAnswer by Galik for How do you implement the Singleton design pattern?
@Loki Astari's answer is excellent. However there are times with multiple static objects where you need to be able to guarantee that the singleton will not be destroyed until all your static objects...
View ArticleAnswer by Yuriy for How do you implement the Singleton design pattern?
I did not find a CRTP implementation among the answers, so here it is:template<typename HeirT>class Singleton{public: Singleton() = delete; Singleton(const Singleton &) = delete; Singleton...
View ArticleAnswer by Red.Wave for How do you implement the Singleton design pattern?
Has anyone mentioned std::call_once and std::once_flag?Most other approaches - including double checked locking - are broken.One major problem in singleton pattern implementation is safe...
View ArticleAnswer by Ali Khazaee for How do you implement the Singleton design pattern?
Simple singleton class, This must be your header class file#ifndef SC_SINGLETON_CLASS_H#define SC_SINGLETON_CLASS_Hclass SingletonClass{ public: static SingletonClass* Instance() { static...
View ArticleAnswer by Kevin Marshall for How do you implement the Singleton design pattern?
My implementation is similar to Galik's. The difference is my implementation allows the shared pointers to clean up allocated memory, as opposed to holding onto the memory until the application is...
View ArticleAnswer by Tony Bai for How do you implement the Singleton design pattern?
We went over this topic recently in my EECS class. If you want to look at the lecture notes in detail, visit http://umich.edu/~eecs381/lecture/IdiomsDesPattsCreational.pdf. These notes (and quotations...
View ArticleAnswer by Ali Sajjad Rizavi for How do you implement the Singleton design...
Your code is correct, except that you didn't declare the instance pointer outside the class. The inside class declarations of static variables are not considered declarations in C++, however this is...
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