Re: singleton question
On 02/03/2011 17:28, Victor Bogado wrote:
On Mar 2, 12:31 pm, Leigh Johnston<le...@i42.co.uk> wrote:
On 02/03/2011 15:25, Victor Bogado wrote:
On Feb 24, 12:23 pm, kathy<yqin...@yahoo.com> wrote:
...
template<class T> T* CSingleton<T>::m_pInstance=NULL;
template<class T> T* CSingleton<T>::GetInstance()
{
if(!m_pInstance)
m_pInstance = new T;
Also This is not thread safe, you could have a race condition that
would end up with 2 instances. The best solution is to use the
instance as a static local in the instance method. The standard says
that it will be instantiated before the first call.
No; such a static will be instantiated *during* the first call however
you still have a race condition with a local static in a multi-threaded
situation.
/Leigh
This would have a race condition? I was under the impression that the
instantiation in that case would be atomic, but I never read the
standard myself, so I could be wrong :P.
static SingletonType& SingletonType::instance()
{
SingletonType instance;
return instance;
}
You forgot the static keyword; with the static keyword it is not
thread-safe.
/Leigh
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