Re: Threadsafe singletons

"David Barrett-Lennard" <>
31 Jul 2006 10:10:26 -0400
<> wrote:

Tell me if I have your idea correct because this isn't working for me.

/////////// singleton.h
class Singleton
    char *name;

    static Singleton& GetInstance();

    char *GetName() const { return name; }
    void SetName(char *n) { name = n; }


/////////// singleton.cpp
#include "singleton.h"


/////////// main.cpp
#include "singleton.h"

#include <iostream>

Singleton& Singleton::GetInstance()
    static Singleton s;
    return s;

static struct InitSingleton
        Singleton s = Singleton::GetInstance();
        s.SetName("Super Duper");
} s_init;

int main()
    Singleton singleton = Singleton::GetInstance();

    std::cout << "The singleton's name is: " <<
        singleton.GetName() << std::endl;

    return 0;

I'm not getting a "Super Duper" Singleton

Did it crash? Your constructor doesn't initialise the 'name' member
and the statement s.SetName("Super Duper") is setting the name of a
copy of the class (not the original).

Rather than

   Singleton s = Singleton::GetInstance();

you should instead write

    Singleton& s = Singleton::GetInstance();

I suggest you make the copy constructor and assignment operator of your
Singleton class private to avoid copying.

BTW I also suggest you use a proper string member rather than simply
alias a null terminated string with a char pointer. It's rather

David Barrett-Lennard

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