I think this is basically a problem of trying to use a C library as a
C++ library. What are you trying to do? If you just want to create a
vector of PmStream, I think you can set the vector length at creation
time or after creating it. You don't need to construct it
incrementally/iteratively by calling push_back() n times.
If you want to open streams and add them to the list, then do something
like:
PmStream *s;
if (Pm_OpenOutput(&s, ...) == pmNoError) {
v.push_back(s);
}
In C++, you might expect that if you delete a vector, the components of
the vector will be properly deallocated, but since the components here
are just pointers, you'll have to explicitly call Pm_Close() on each
vector element before deleting the vector.
This could be handled by "smart pointers" similar to C++ strings, but I
think that's overkill for a simple problem (unless someone wants to
fully wrap PortMidi as a C++ class, similar to the Java API).
-Roger
Hi,
I have a std:vector of PmStream* but I can't figure out a way to
create the stream objects on-the-fly. Here's my code:
Int streamcount = some_value;
int i;
std::vector < PmStream*> v;
for (i = 0; i < streamcount; i++)
{
// VS2010 reports error C2469: 'new' : cannot allocate 'void' objects
with the following line
PmStream* s = new PmStream();
v.push_back(s);
}
Can anybody see where I'm going wrong, please? My research on the net
would seem to indicate that using "new" to create instances of a void
(abstract) class isn't allowed, but I can't find a work-around.
Best wishes.
Tim Burgess
Raised Bar Ltd
Phone: +44 (0)1827 719822
Don't forget to vote for improved access to music and music technology at
http://www.raisedbar.net/petition.htm
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