Re: singleton initialization

Carl Barron <>
Thu, 17 May 2007 02:21:26 CST
In article <f2f7u4$ip3$1$>, Francis Glassborow
<> wrote:

Fei Liu wrote:

Ah, so this is the C++ way of doing it...I may be wrong, but in C at
least for plain old datatype, function static variable initialization
happens at compile time.

You sure about that? Sorry I am moving house and all my reference books
are packed away, but that would mean that a function static could only
be initialised with a const expression. I thought that functions statics
were initialised the first time the flow of execution passes through them.

The C99 standard does require the initializers of static variables to
be constant expressions [6.7.7 of c99]. So it is possible for a C
compiler to initailize all statics at compile time, removing a need to
test for first entry, but it is not requried by what I read unless
'may' means 'is'. [c99, section 6.7.8 para 4] reads:
All the expressions in an initializer for an object that has static
storage duration shall be constant expressions or string literals.

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