Re: Static local variable in an inline static member function

=?iso-8859-1?q?Daniel_Kr=FCgler?= <>
Fri, 26 Oct 2007 03:06:53 CST
On 26 Okt., 02:23, "" <> wrote:

struct A {
      static A& get() {
               static A a;
               return a;


OK, this is Meyers singleton.


If this appears in a header file that is then included in multiple
translation units, is it supposed to be guaranteed that there is only
one copy of the static A object?

Yes, this is guaranteed, see [dcl.fct.spec]/4:

"[..] An inline function with external linkage shall have the same
address in all translation units. A static local variable in an extern
inline function always refers to the same object. A string literal in an
extern inline function is the same object in different translation units."

That seems difficult for the compiler/
linker to insure, since multiple copies of the function get() will be
generated, but it's probably what the code intends, right? I'm asking
because I know of definite examples where a particular version of g++
breaks on similar code.

This particular version of g++ is not alone, see e.g. a case description,
where the MS VS2003 compiler can't handle this properly:

Greetings from Bremen,

Daniel Kr?gler

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