//
#define declare_singleton(class)    \
private:                \
class();                \
class(const class&);            \
class(class&);              \
void operator=(const class&);       \   //usw
~class();               \
public:                 \
friend class &singleton<class>();

//
#define define_singleton(class)     \
template <typename T>           \
T &fSingleton(){            \
    static T t;             \
    return t;               \
}                   \
class &S_##class=fSingleton<class>();

//x.h
extern class x{
    declare_singleton(x);
} &S_x;

//x.cpp
define_singleton(x);