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// { dg-options "-fpreview=dip1008" }
class E : Exception
{
static int instances;
this(string msg = "", Throwable nextInChain = null)
{
super(msg, nextInChain);
instances++;
}
~this()
{
instances--;
}
}
void main()
{
alias chain = Exception.chainTogether;
assert(chain(null, null) is null);
try
{
throw new E();
}
catch (E e)
{
assert(E.instances == 1);
assert(e.refcount == 2);
}
assert(E.instances == 0);
try
{
throw new E();
}
catch (E e)
{
assert(chain(null, e) is e);
assert(e.refcount == 2); // "Owned by e" + 1
}
assert(E.instances == 0);
try
{
throw new E();
}
catch (E e)
{
assert(chain(e, null) is e);
assert(e.refcount == 2); // "Owned by e" + 1
}
assert(E.instances == 0);
try
{
throw new E("first");
}
catch (E first)
{
try
{
throw new E("second");
}
catch (E second)
{
try
{
throw new E("third");
}
catch (E third)
{
assert(chain(first, second) is first);
assert(first.next is second);
assert(second.next is null);
assert(chain(first, third) is first);
assert(first.next is second);
assert(second.next is third);
assert(third.next is null);
assert(first.refcount == 2);
assert(second.refcount == 3);
assert(third.refcount == 3);
}
}
assert(E.instances == 3);
}
assert(E.instances == 0);
try
{
throw new E("first");
}
catch (E first)
{
assert(first.refcount == 2);
assert(E.instances == 1);
try
{
throw new E("second", first);
}
catch (E second)
{
assert(first.next is null);
assert(second.next is first);
assert(first.refcount == 3);
assert(second.refcount == 2);
assert(E.instances == 2);
}
assert(first.refcount == 2);
assert(E.instances == 1);
}
assert(E.instances == 0);
}
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