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add specialisation to deal with wrapping a reference...

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This commit is contained in:
Fischlurch 2009-12-21 06:19:56 +01:00
parent 6a7f325ecf
commit e5ab9d73eb
2 changed files with 81 additions and 18 deletions
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59
src/lib/wrapper.hpp
View file

@ -217,6 +217,65 @@ namespace wrapper {
}
};
/**
* Specialisation of the ItemWrapper to deal with references,
* as if they were pointer values. Allows the reference value
* to be default constructed to \c NULL and to be re-assigned.
*/
template<typename TY>
class ItemWrapper<TY &>
: public BoolCheckable<ItemWrapper<TY &> >
{
// mutable
TY * content_;
public:
ItemWrapper()
: content_()
{ }
explicit
ItemWrapper(TY& o)
: content_( &o )
{ }
/* using default copy and assignment */
/** allowing to re-bind the reference */
ItemWrapper&
operator= (TY& otherRef)
{
content_ = &otherRef;
return *this;
}
/* == value access == */
TY&
operator* () const
{
if (!content_)
throw lumiera::error::State ("accessing uninitialised reference wrapper"
, LUMIERA_ERROR_BOTTOM_VALUE);
return *content_;
}
bool
isValid () const
{
return bool(content_);
}
void
reset ()
{
content_ = 0;
}
};
}} // namespace lib::wrap

40
tests/lib/item-wrapper-test.cpp
View file

@ -79,28 +79,31 @@ namespace test{
virtual void
run (Arg)
{
UNIMPLEMENTED ("check ItemWrapper");
ulong l1 (rand() % 1000);
ulong l2 (rand() % 1000);
string s1 (randStr(50));
string s2 (randStr(50));
const char* cp (s1.c_str());
// Tracker t1;
// Tracker t2;
ulong ll (rand() % 1000);
string ss (randStr(50));
const char* cp (ss.c_str());
// Tracker tt;
verifyWrapper<ulong> (ItemWrapper<ulong> (ll), ll, -123);
verifyWrapper<ulong> (l1, l2);
verifyWrapper<ulong&> (l1, l2);
#if false //////////////////////////////////////////////////////////////////////////////////////////////////////////TICKET 475 !!!!!!!!!
verifyWrapper (ItemWrapper<ulong&> (ll), ll, 45678 );
verifyWrapper (ItemWrapper<ulong const&> (ll), ll, 0 );
verifyWrapper (ItemWrapper<ulong*> (&ll), &ll, (ulong*) 0 );
verifyWrapper<ulong*> (&l1, &l2);
verifyWrapper<ulong*> ((0), &l2);
verifyWrapper<ulong*> (&l1, (0));
verifyWrapper<ulong const&> (l1, l2);
verifyWrapper (ItemWrapper<string> (ss), ss, "Lumiera");
verifyWrapper (ItemWrapper<string&> (ss), ssl, string() );
verifyWrapper (ItemWrapper<string*> (&ss), &ss, randStr(12));
verifyWrapper<string> (s1, s2);
verifyWrapper<string&> (s1, s2);
verifyWrapper<string*> (&s1, &s2);
verifyWrapper (ItemWrapper<Tracker> (tt), tt, Tracker());
verifyWrapper (ItemWrapper<Tracker&> (tt), tt, Tracker());
verifyWrapper (ItemWrapper<Tracker*> (&tt), &tt, (Tracker*) 0 );
verifyWrapper<Tracker> (t1, t2);
verifyWrapper<Tracker&> (t1, t2);
verifyWrapper<Tracker*> (&t1, &t2);
verifyWrapper (ItemWrapper<const char*> (cp), cp, "Lumiera");
verifyWrapper<const char*> (cp, "Lumiera");
#endif //////////////////////////////////////////////////////////////////////////////////////TODO using yet undefined facilities.....!!!!!
verifyWrappedRef ();
@ -109,8 +112,9 @@ namespace test{
template<typename X>
void
verifyWrapper (ItemWrapper<X> const& wrap, X const& val, X const& otherVal)
verifyWrapper (X val, X otherVal)
{
const ItemWrapper<X> wrap(val);
ASSERT (wrap);
ItemWrapper<X> copy1 (wrap);