Re: [boost] Review Request: Singularity

On Mon, Aug 22, 2011 at 5:15 PM, Mathias Gaunard <mathias.gaunard@ens-lyon.org> wrote:

struct my_singleton { private:    my_singleton() {}    my_singleton(const my_singleton&);

public:    static my_singleton& instance()    {        static my_singleton ins;        return ins;    } };

which is simple, short, fast to compile, and thread-safe.

Thread-safe under which version of the language? Maybe C++11 (?), but otherwise depends on the compiler and/or compiler flags, I think. In particular, there is a race as to which thread is the "first" caller to instace(), and thus a race on the construction of `ins`. Tony