Method pointer

internal/ceres/gtest/gtest.h:1825–1825

  ~ThreadLocal() { ThreadLocalRegistry::OnThreadLocalDestroyed(this); }

  T* pointer() { return GetOrCreateValue(); }
  const T* pointer() const { return GetOrCreateValue(); }
  const T& get() const { return *pointer(); }
  void set(const T& value) { *pointer() = value; }