singleton.h

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#pragma once
 
#include "fl/namespace.h"
 
namespace fl {
 
// A templated singleton class, parameterized by the type of the singleton and
// an optional integer.
template <typename T, int N = 0> class Singleton {
  public:
    static T &instance() {
        // We love function level singletons!! They don't get construction until first call.
        // And they seem to have locks on them in most compilers. So yay.
        static T instance;
        return instance;
    }
    static T &instance() {…}
    static T *instanceRef() { return &instance(); }
    Singleton(const Singleton &) = delete;
    Singleton &operator=(const Singleton &) = delete;
 
  private:
    Singleton() = default;
    ~Singleton() = default;
};
template <typename T, int N = 0> class Singleton {…};
 
} // namespace fl