Re: singleton initialization
On May 16, 6:26 am, Keith H Duggar <dug...@alum.mit.edu> wrote:
Alf P. Steinbach wrote:
Fei Liu:
static CTestClass& instance()
{
static CTestClass* m_instance;
if(!m_instance) m_instance = new CTestClass;
return m_instance;
}
This merely replicates the code generated by the compiler for the
original, but in a more verbose and possibly less efficient way.
And it's still more verbose and possibly less efficient than:
static CTestClass& instance()
{
static CTestClass m_instance;
return m_instance;
}
which also destroys the instance properly and automatically.
And thus introduces order of destruction issues. As a general
rule, it is preferable that the instance of a singleton NOT be
destructed. Ever.
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