21.string.stdcxx-162.cpp

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#include <cassert>
#include <string>
 
#ifdef _RWSTD_POSIX_THREADS
#  include <pthread.h>
#  define MUTEX   pthread_mutex_t
#elif _RWSTD_SOLARIS_THREADS
#  include <thread.h>
#  define MUTEX   mutex_t
#endif   // _RWSTD_POSIX_THREADS
 
int main ()
{
    typedef std::char_traits<char> Traits;
    typedef std::allocator<char> Allocator;
    typedef __rw::__string_ref<char, Traits, Allocator> strref;
 
    struct SmallRef {
        int ref_count;
        std::string::size_type capacity;
        std::string::size_type size;
    };
 
    // verify that the reference-counted string body isn't bigger
    // than the struct above
    assert (sizeof (strref) <= sizeof (SmallRef));
 
#ifdef MUTEX
 
    struct LargeRef {
        MUTEX                  mutex;
        int                    ref_count;
        std::string::size_type capacity;
        std::string::size_type size;
    };
 
    // verify that the reference-counted string body is smaller
    // than the struct containing a full-blown mutex object above
    assert (sizeof (strref) < sizeof (LargeRef));
 
#endif   // MUTEX
 
    return 0;
}