Re: singleton initialization

James Kanze <>
Wed, 16 May 2007 04:13:40 CST
On May 16, 6:26 am, Keith H Duggar <> 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.

James Kanze (GABI Software)
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