Re: singleton initialization
Eric wrote:
I created a singleton class as in the example below. The application
sporadically crashes in the second line of the main function as shown.
However, when I change the singleton such that the static pointer is a
class member (defined in the cpp file) and the instance function
creates the object if the pointer is NULL, then it works fine. I would
appreciate any explanations as to why this happens.
class CTestClass
{
public:
static CTestClass& instance()
{
static CTestClass* m_instance = new CTestClass;
This doesn't make sense. How can the compiler create this object at
compile time? Change this to:
static CTestClass& instance()
{
static CTestClass* m_instance;
if(!m_instance) m_instance = new CTestClass;
return m_instance;
}
return *m_instance;
}
private:
CTestClass() { /* do some stuff */ }
};
int main()
{
CTestClass::instance(); // initialize singleton here to
avoid future race conditions
// sporadically crashes here when using CTestClass::instance()
}
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