[boost] Thread-safe singleton pattern

25 Jan 2010

      I propose thread safe singleton pattern implementation
(see http://www.research.ibm.com/designpatterns/pubs/ph-jun96.txt).

I have attached "singleton.hpp" to this letter.

Below is the test program:

#include <stdio.h>
#include <singleton.hpp>

class A : public boost::Singleton<A>
{
    //
    // Only Singleton class can create and delete us!
    //
    SINGLETON_IS_MY_FRIEND;
public:
    void foo(){ printf("foo!\n"); }
    A(){ printf("A()\n"); }
    ~A(){ printf("~A()\n"); }
};

void main()
{
    // It is not compiled:
    //A a = A::Instance();
    // That is exactly as it should be used:
    A::Instance().foo();
}

Test program outputs:
A()
foo!
~A()

My question: Does Boost community think that boost::Singleton is convenient
(or successful) solution?

[boost] Thread-safe singleton pattern

Andrew Chinkoff