#include <locale>
#include <cassert>
template <class C>
class my_facet
: public std::ctype<C>
{
public:
static int count;
explicit my_facet(std::size_t refs = 0)
: std::ctype<C>(refs) {++count;}
~my_facet() {--count;}
};
template <class C> int my_facet<C>::count = 0;
int main()
{
{
std::locale l(std::locale::classic(), new my_facet<wchar_t>);
assert(my_facet<wchar_t>::count == 1);
}
assert(my_facet<wchar_t>::count == 0);
{
my_facet<wchar_t> f(1);
assert(my_facet<wchar_t>::count == 1);
{
std::locale l(std::locale::classic(), &f);
assert(my_facet<wchar_t>::count == 1);
}
assert(my_facet<wchar_t>::count == 1);
}
assert(my_facet<wchar_t>::count == 0);
}