Re: wrapping synchronization in objects?

James Kanze <>
Wed, 1 Apr 2009 13:09:28 -0700 (PDT)
On Apr 1, 5:47 pm, "Gernot Frisch" <> wrote:

is it possible (win32, *nix, only) to create a template class
that locks/unlocks a mutex every time the value of an object
is used?


template <typename T> class wrapper
    wrapper() :m_t() {}
    wrapper(const T& t) :m_t(t) {}
    operator T() const
       T t;
       return t;
    T operator = (const T& t)
       m_t = t;
       return t;
    T m_t;
    void lock()const {/*EnterCricitcalSection...whatever*/}
    void unlock()const{/*LeaveCriticalSection...*/}

int main()
    wrapper<int> i = 13;
 return i;

Doubtlessly, but I doubt that it would be very useful.
Individual accesses rarely have the right granularity for
locking. (There are exceptions, of course, but they're rare
enough to probably not justify a generic solution.) Of course,
you'd want a scoped lock in the two functions, in case the
assignment threw an exception.

James Kanze (GABI Software)
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