c++ - ブースト時のセマフォ

Question

私は使用してnamed_semaphoreいて、セマフォを宣言してプロセスの数を尋ねたいのですが、現時点では次のようになります。

const unsigned N_CORES = boost::thread::hardware_concurrency();
named_semaphore SEMAPHORE(open_or_create, PROCESS_NAME, N_CORES);

最初に SEMAPHORE を宣言し、別の時点でコア数を取得します。

APIによると：

  //!Creates a global semaphore with a name, and an initial count. 
  //!If the semaphore can't be created throws interprocess_exception
  named_semaphore(create_only_t, const char *name, unsigned int initialCount);

  //!Opens or creates a global semaphore with a name, and an initial count. 
  //!If the semaphore is created, this call is equivalent to
  //!named_semaphore(create_only_t, ...)
  //!If the semaphore is already created, this call is equivalent to
  //!named_semaphore(open_only_t, ... )
  //!and initialCount is ignored.
  named_semaphore(open_or_create_t, const char *name, unsigned int initialCount);

そして私は試しました：

 const unsigned N_CORES = boost::thread::hardware_concurrency();
 named_semaphore SEMAPHORE(create_only, PROCESS_NAME, N_CORES);

 // at other point
 SEMAPHORE(open_or_create, PROCESS_NAME, numberOfCores);

しかし、このエラーを表示します:

term does not evaluate to a function taking 3 arguments