_M_is_shared()

template<typename _CharT, typename _Traits, typename _Alloc>

bool std::basic_string< _CharT, _Traits, _Alloc >::_Rep::_M_is_shared ( ) const

inlinenoexcept

Definition at line 213 of file cow_string.h.

      {
#if defined(__GTHREADS)
        // _M_refcount is mutated concurrently by _M_refcopy/_M_dispose,
        // so we need to use an atomic load. Another thread can drop last
        // but one reference concurrently with this check, so we need this
        // load to be acquire to synchronize with release fetch_and_add in
        // _M_dispose.
        if (!__gnu_cxx::__is_single_threaded())
          return __atomic_load_n(&this->_M_refcount, __ATOMIC_ACQUIRE) > 0;
#endif
        return this->_M_refcount > 0;
      }

References __gnu_cxx::__is_single_threaded(), and std::basic_string< _CharT, _Traits, _Alloc >::_Rep_base::_M_refcount.

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