"Neal Becker" write:
I'm a little confused about singleton usage. Can a singleton have a constructor?
I tried this:
using boost::basic_singleton;
struct Example : public basic_singleton<Example> { Example() { std::cout << "Hello\n"; } int Cnt() const { return 0; } };
int main() { Example::pointer ptr; std::cout << ptr->Cnt(); }
./Test1 0
It appears constructor wasn't run, because nothing was printed.
I tried it with Intel 7 (plugged in VC6 IDE) and it works for me. What is your compiler? Singleton can have constructors, many of them and with parameters too. One may do: Example::pointer ptr; ... ptr->destroy(); ptr->create(100, "sss", 3.14); ... ptr->destroy(); ptr->do_something(); // default ctor will be used first ... ptr->destroy(); ptr->create(); // default ctor ptr->create(); // ignored here /Pavel