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struct foo
  foo() { std::puts("foo"); }
  void f() { std::puts("f"); }

struct sth
  static foo foo_;
  sth() { foo_.f(); }

sth s; // oops!
foo sth::foo_;


struct sth
  static foo& foo_()
    static foo f;
    return (f);

  sth() { foo_().f(); }

加えて、c++11からはスレッドセーフである。(visual studioでは2015からスレッドセーフが保証されたはず)

出展: c++ more idioms Construct On First Use

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