On 01/05/2016 06:56 PM, Walter Bright wrote:
On 1/5/2016 1:30 PM, Jakob Ovrum wrote:
On Tuesday, 5 January 2016 at 17:23:38 UTC, Walter Bright wrote:
At the exit of a catch clause, the destructor on the caught C++
exception will
be run, as would be expected by C++ programmers.
Does this work with rethrow? What if a D exception is thrown from a
C++ catch
block - will the C++ exception still be destroyed properly?
My understanding is that rethrow invokes the copy constructor, so the
original can still be destroyed.
To clarify what C++ does, consider:
try { ... }
catch (std::exception& e)
{
throw e;
}
This throws a copy of e and is almost always not the desired/expected
behavior because the original dynamic type of e (which may be a class
derived from std::exception) is lost. Now consider:
try { ... }
catch (std::exception& e)
{
throw;
}
In this case no copy is created. The same exact dynamic object continues
to be thrown up the chain.
Andrei
