20.smartptr.weak.cpp

Go to the documentation of this file.

// -*- C++ -*-
 
#include <rw_driver.h>
 
// compile out all test code if extensions disabled
#ifndef _RWSTD_NO_EXT_CXX_0X
 
#include <rw/_smartptr.h>
 
 
template <class T>
struct Base
{
    static int n_dtors;
 
    virtual ~Base () {
        ++n_dtors;
    }
};
 
template <class T>
int Base<T>::n_dtors;
 
 
template <class T>
struct Derived: Base<T>
{
    static int n_dtors;
 
    virtual ~Derived () {
        ++n_dtors;
    }
};
 
template <class T>
int Derived<T>::n_dtors;
 
 
template <class T>
struct Derived2: Base<T>
{
    static int n_dtors;
 
    virtual ~Derived2 () {
        ++n_dtors;
    }
};
 
template <class T>
int Derived2<T>::n_dtors;
 
 
template <class T>
struct Deleter
{
    static int n_def_ctors;
    static int n_cpy_ctors;
    static int n_dtors;
    static int n_funcalls;
 
    Deleter () {
        ++n_def_ctors;
    }
 
    Deleter (const Deleter&) {
        ++n_cpy_ctors;
    }
 
    virtual ~Deleter () {
        ++n_dtors;
    }
 
    void operator()(T *p) {
        ++n_funcalls;
        delete p;
    }
 
private:
    void operator=(Deleter&);   // not defined
};
 
template <class T>
int Deleter<T>::n_def_ctors;
 
template <class T>
int Deleter<T>::n_cpy_ctors;
 
template <class T>
int Deleter<T>::n_dtors;
 
template <class T>
int Deleter<T>::n_funcalls;
 
 
static void
test_ctor ()
{
    rw_info (0, "util.smartptr.weak.cons", 0,
             "weak_ptr constructors");
 
    {   // default ctor
        std::weak_ptr<char> weak;
        rw_assert (0 == weak.use_count (), 0, __LINE__, "");
    }
 
    {   // shared_ptr converting ctor
        std::shared_ptr<char> shared;
        std::weak_ptr<char>   weak (shared);
        rw_assert (0 == weak.use_count (), 0, __LINE__, "");
    }
 
    {   // shared_ptr converting ctor
        std::shared_ptr<char> shared;
        std::weak_ptr<void>   weak (shared);
        rw_assert (0 == weak.use_count (), 0, __LINE__, "");
    }
 
    {   // shared_ptr converting ctor
        int* const p = new int (__LINE__);
        std::shared_ptr<int> shared (p);
        std::weak_ptr<int>   weak (shared);
        rw_assert (shared.use_count () == weak.use_count (), 0, __LINE__, "");
    }
 
    {   // shared_ptr converting ctor
        int* const p = new int (__LINE__);
        std::shared_ptr<int> shared0 (p);
        std::shared_ptr<int> shared1 (shared0);
        std::weak_ptr<int>   weak (shared1);
        rw_assert (shared1.use_count () == weak.use_count (), 0, __LINE__, "");
    }
 
 
    {   // shared_ptr converting ctor
        int* const p = new int (__LINE__);
        std::shared_ptr<int> shared (p);
        std::weak_ptr<void>  weak (shared);
        shared.reset ();
 
        rw_assert (0 == weak.use_count (), 0, __LINE__, "");
    }
 
    {   // shared_ptr converting ctor
        Derived<int>* const p = new Derived<int>;
        std::shared_ptr<Derived<int> > shared (p);
        std::weak_ptr<Base<int> >      weak (shared);
        shared.reset ();
 
        rw_assert (0 == weak.use_count (), 0, __LINE__, "");
    }
}
 
 
static void
test_copy_ctor ()
{
    rw_info (0, "util.smartptr.weak.copy", 0,
             "weak_ptr copy constructors");
 
    {
        // weak_ptr (const weak_ptr&)
        std::weak_ptr<void> weak;
        std::weak_ptr<void> copy (weak);
        rw_assert (0 == weak.use_count (), 0, __LINE__, "");
        rw_assert (0 == copy.use_count (), 0, __LINE__, "");
    }
 
    {
        // weak_ptr (const weak_ptr&)
        int* const p = new int (__LINE__);
        std::shared_ptr<int> shared (p);
        std::weak_ptr<int>   weak (shared);
        std::weak_ptr<int>   copy (weak);
 
        rw_assert (weak.use_count () == shared.use_count (), 0, __LINE__, "");
        rw_assert (copy.use_count () == shared.use_count (), 0, __LINE__, "");
    }
 
    {
        // weak_ptr (const weak_ptr&)
        int* const p = new int (__LINE__);
        std::shared_ptr<int> shared0 (p);
        std::shared_ptr<int> shared1 (shared0);
        std::weak_ptr<int>   weak (shared1);
        std::weak_ptr<int>   copy (weak);
 
        rw_assert (weak.use_count () == shared1.use_count (), 0, __LINE__, "");
        rw_assert (copy.use_count () == shared1.use_count (), 0, __LINE__, "");
    }
 
    {
        // weak_ptr (const weak_ptr&)
        int* const p = new int (__LINE__);
        std::shared_ptr<int> shared0 (p);
        std::shared_ptr<int> shared1 (shared0);
        std::weak_ptr<int>   weak (shared1);
        std::weak_ptr<void>  copy (weak);
 
        rw_assert (weak.use_count () == shared1.use_count (), 0, __LINE__, "");
        rw_assert (copy.use_count () == shared1.use_count (), 0, __LINE__, "");
    }
 
    {
        // weak_ptr (const weak_ptr&)
        Derived<int>* const p = new Derived<int>;
        std::shared_ptr<Derived<int> > shared0 (p);
        std::shared_ptr<Derived<int> > shared1 (shared0);
        std::weak_ptr<Derived<int> >   weak (shared1);
        std::weak_ptr<Base<int> >      copy (weak);
 
        rw_assert (weak.use_count () == shared1.use_count (), 0, __LINE__, "");
        rw_assert (copy.use_count () == shared1.use_count (), 0, __LINE__, "");
 
        shared1.reset ();
        rw_assert (copy.use_count () == weak.use_count (), 0, __LINE__, "");
        rw_assert (copy.use_count () == shared0.use_count (), 0, __LINE__, "");
 
        shared0.reset ();
        rw_assert (copy.use_count () == weak.use_count (), 0, __LINE__, "");
        rw_assert (copy.use_count () == shared0.use_count (), 0, __LINE__, "");
    }
}
 
 
static void
test_dtor ()
{
    rw_info (0, "util.smartptr.weak.dest", 0,
             "weak_ptr destructor");
 
    {
        // ~weak_ptr()
        const int base_dtors = Base<int>::n_dtors;
        {
            std::weak_ptr<Base<int> > weak;
        }
        rw_assert (base_dtors == Base<int>::n_dtors, 0, __LINE__, "");
    }
 
    {
        // ~weak_ptr()
        const int base_dtors = Base<int>::n_dtors;
        Base<int>* const p = new Base<int>;
        std::shared_ptr<Base<int> > shared (p);
        {
            std::weak_ptr<Base<int> > weak (shared);
        }
        rw_assert (base_dtors == Base<int>::n_dtors, 0, __LINE__, "");
    }
 
    {
        // ~weak_ptr()
        const int base_dtors    = Base<int>::n_dtors;
        const int derived_dtors = Derived<int>::n_dtors;
 
        Derived<int>* const p = new Derived<int>;
        std::shared_ptr<Derived<int> > shared (p);
 
        {
            std::weak_ptr<Base<int> > weak (shared);
        }
        rw_assert (base_dtors    == Base<int>::n_dtors, 0, __LINE__, "");
        rw_assert (derived_dtors == Derived<int>::n_dtors, 0, __LINE__, "");
    }
 
    {
        // ~weak_ptr()
        const int base_dtors    = Base<int>::n_dtors;
        const int derived_dtors = Derived<int>::n_dtors;
 
        Derived<int>* const p = new Derived<int>;
        std::shared_ptr<Derived<int> > shared (p);
 
        {
            std::weak_ptr<Base<int> > weak (shared);
            std::weak_ptr<Base<int> > copy (shared);
        }
        rw_assert (base_dtors    == Base<int>::n_dtors, 0, __LINE__, "");
        rw_assert (derived_dtors == Derived<int>::n_dtors, 0, __LINE__, "");
    }
 
    {
        // ~weak_ptr()
        const int base_dtors    = Base<int>::n_dtors;
        const int derived_dtors = Derived<int>::n_dtors;
 
        Derived<int>* const p = new Derived<int>;
        std::shared_ptr<Derived<int> > shared (p);
 
        {
            std::weak_ptr<Base<int> > weak (shared);
            shared.reset ();
        }
        rw_assert (base_dtors + 1    == Base<int>::n_dtors, 0, __LINE__, "");
        rw_assert (derived_dtors + 1 == Derived<int>::n_dtors, 0, __LINE__, "");
    }
 
    {
        // ~weak_ptr()
        const int base_dtors    = Base<int>::n_dtors;
        const int derived_dtors = Derived<int>::n_dtors;
 
        std::weak_ptr<Derived<int> > weak;
 
        {
            Derived<int>* const p = new Derived<int>;
            std::shared_ptr<Derived<int> > shared (p);
 
            weak = shared;
        }
        rw_assert (base_dtors + 1    == Base<int>::n_dtors, 0, __LINE__, "");
        rw_assert (derived_dtors + 1 == Derived<int>::n_dtors, 0, __LINE__, "");
    }
}
 
 
static void
test_assign ()
{
    rw_info (0, "util.smartptr.weak.assign", 0,
             "weak_ptr assignment operators");
 
#if 0
 
    {   // operator=(const weak_ptr&)
        std::weak_ptr<void> ptr0;
        std::weak_ptr<void> ptr1;
 
        ptr1 = ptr0;
 
        rw_assert (ptr1.get () == ptr0.get (), 0, __LINE__, "");
        rw_assert (ptr1.use_count () == ptr0.use_count (), 0, __LINE__, "");
    }
 
    {   // operator=(const weak_ptr&)
        int* const p = new int (__LINE__);
        std::weak_ptr<int> ptr0 (p);
        std::weak_ptr<int> ptr1;
 
        ptr1 = ptr0;
 
        rw_assert (ptr1.get () == ptr0.get (), 0, __LINE__, "");
        rw_assert (ptr1.use_count () == ptr0.use_count (), 0, __LINE__, "");
    }
 
    {   // template <class U> operator=(const weak_ptr<U>&)
        int* const p = new int (__LINE__);
        std::weak_ptr<int> ptr0 (p);
        std::weak_ptr<void> ptr1;
 
        ptr1 = ptr0;
 
        rw_assert (ptr1.get () == ptr0.get (), 0, __LINE__, "");
        rw_assert (ptr1.use_count () == ptr0.use_count (), 0, __LINE__, "");
    }
 
    {   // template <class U> operator=(const weak_ptr<U>&)
        Derived<int>* const p = new Derived<int>;
        std::weak_ptr<Derived<int> > ptr0 (p);
        std::weak_ptr<Base<int> > ptr1;
 
        ptr1 = ptr0;
 
        rw_assert (ptr1.get () == ptr0.get (), 0, __LINE__, "");
        rw_assert (ptr1.use_count () == ptr0.use_count (), 0, __LINE__, "");
    }
 
    {   // template <class U> operator=(const weak_ptr<U>&)
        Derived<int>* const p = new Derived<int>;
        std::weak_ptr<Base<int> > ptr0 (p);
        std::weak_ptr<void>       ptr1;
 
        ptr1 = ptr0;
 
        rw_assert (ptr1.get () == ptr0.get (), 0, __LINE__, "");
        rw_assert (ptr1.use_count () == ptr0.use_count (), 0, __LINE__, "");
    }
 
#endif   // 0/1
 
}
 
 
static void
test_modifiers ()
{
    rw_info (0, "util.smartptr.weak.mod", 0,
             "weak_ptr modifiers");
 
    rw_warn (0, 0, 0,
             "weak_ptr modifiers not exercised");
}
 
 
static void
test_observers ()
{
    rw_info (0, "util.smartptr.weak.obs", 0,
             "weak_ptr observers");
 
    {   // use_count()
        std::weak_ptr<void> weak;
        rw_assert (0 == weak.use_count (), 0, __LINE__, "");
    }
 
    {   // expired()
        std::weak_ptr<void> weak;
        rw_assert (weak.expired (), 0, __LINE__, "");
    }
 
    {   // expired()
        std::shared_ptr<void> shared;
        std::weak_ptr<void>   weak (shared);
        rw_assert (weak.expired (), 0, __LINE__, "");
    }
 
    {   // expired()
        int* const p = new int (__LINE__);
        std::shared_ptr<void> shared (p);
        std::weak_ptr<void>   weak (shared);
        rw_assert (!weak.expired (), 0, __LINE__, "");
    }
 
    {   // expired()
        int* const p = new int (__LINE__);
        std::shared_ptr<void> shared (p);
        std::weak_ptr<void>   weak (shared);
        shared.reset ();
        rw_assert (weak.expired (), 0, __LINE__, "");
    }
 
    {   // lock()
        std::weak_ptr<void>   weak;
        std::shared_ptr<void> shared (weak.lock ());
        
        rw_assert (0 == weak.use_count (), 0, __LINE__,
                   "weak_ptr<void>::use_count() == 1, got %ld",
                   weak.use_count ());
        rw_assert (0 == shared.use_count (), 0, __LINE__,
                   "shared_ptr<void>::use_count() == 1, got %ld",
                   shared.use_count ());
    }
 
    {   // lock()
        int* const p = new int (__LINE__);
        std::shared_ptr<void> shared0 (p);
        std::weak_ptr<void>   weak (shared0);
        std::shared_ptr<void> shared1 (weak.lock ());
        
        rw_assert (2 == weak.use_count (), 0, __LINE__,
                   "weak_ptr<void>::use_count() == 2, got %ld",
                   weak.use_count ());
        rw_assert (2 == shared1.use_count (), 0, __LINE__,
                   "shared_ptr<void>::use_count() == 2, got %ld",
                   shared1.use_count ());
    }
 
    {   // lock()
        int* const p = new int (__LINE__);
        std::shared_ptr<void> shared0 (p);
        std::weak_ptr<void>   weak (shared0);
        std::shared_ptr<void> shared1 (weak.lock ());
        std::shared_ptr<void> shared2 (shared1);
        
        rw_assert (3 == weak.use_count (), 0, __LINE__,
                   "weak_ptr<void>::use_count() == 3, got %ld",
                   weak.use_count ());
        rw_assert (3 == shared0.use_count (), 0, __LINE__,
                   "shared_ptr<void>::use_count() == 3, got %ld",
                   shared1.use_count ());
 
        shared0.reset ();
 
        rw_assert (2 == weak.use_count (), 0, __LINE__,
                   "weak_ptr<void>::use_count() == 2, got %ld",
                   weak.use_count ());
 
        shared1.reset ();
 
        rw_assert (1 == weak.use_count (), 0, __LINE__,
                   "weak_ptr<void>::use_count() == 1, got %ld",
                   weak.use_count ());
 
        shared2.reset ();
 
        rw_assert (0 == weak.use_count (), 0, __LINE__,
                   "weak_ptr<void>::use_count() == 0, got %ld",
                   weak.use_count ());
    }
}
 
 
static void
test_comparison ()
{
    rw_info (0, "util.smartptr.weak.cmp", 0,
             "weak_ptr comparison");
 
    rw_warn (0, 0, 0,
             "weak_ptr comparison not exercised");
}
 
 
static void
test_specialized ()
{
    rw_info (0, "util.smartptr.weak.spec", 0,
             "weak_ptr specialized algorithms");
 
    rw_warn (0, 0, 0,
             "weak_ptr specialized algorithms not exercised");
}
 
 
static int no_ctor; 
static int no_copy_ctor; 
static int no_dtor; 
static int no_assign; 
static int no_modifiers; 
static int no_observers; 
static int no_comparison; 
static int no_specialized; 
 
 
static int
run_test (int, char*[])
{
#define TEST(what)                                              \
    if (no_ ## what) {                                          \
        rw_note (0, 0, __LINE__, "%s test disabled", #what);    \
    }                                                           \
    else {                                                      \
        test_ ## what ();                                       \
    } typedef void unused_typedef
 
    TEST (ctor);
    TEST (copy_ctor);
    TEST (dtor);
    TEST (assign);
    TEST (modifiers);
    TEST (observers);
    TEST (comparison);
    TEST (specialized);
 
    return 0;
}
 
 
int main (int argc, char *argv[])
{
    return rw_test (argc, argv, __FILE__,
                    "util.smartptr.weak",
                    0 /* no comment */, run_test,
                    "|-no-ctor# "
                    "|-no-copy_ctor# "
                    "|-no-dtor# "
                    "|-no-assign# "
                    "|-no-modifiers# "
                    "|-no-observers# "
                    "|-no-comparison# "
                    "|-no-specialized# ",
                    &no_ctor, 
                    &no_copy_ctor, 
                    &no_dtor, 
                    &no_assign, 
                    &no_modifiers, 
                    &no_observers, 
                    &no_comparison, 
                    &no_specialized);
}
 
#else   // _RWSTD_NO_EXT_CXX_0X
 
static int
run_test (int, char* [])
{
    rw_warn (0, 0, __LINE__,
             "test disabled because _RWSTD_NO_EXT_CXX_0X is defined");
    return 0;
}
 
int main (int argc, char *argv[])
{
    return rw_test (argc, argv, __FILE__,
                    "util.smartptr.weak",
                    0 /* no comment */,
                    run_test,
                    0); 
}
 
#endif  // _RWSTD_NO_EXT_CXX_0X