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The compiler does not work the way you want. It is not an issue of OpenMP but of C++ itself.<br>
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<div dir="ltr">Best regards,
<div>Alexey Bataev</div>
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<blockquote type="cite">16 янв. 2020 г., в 23:20, Itaru Kitayama <itaru.kitayama@gmail.com> написал(а):<br>
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<div dir="ltr">#include <stdio.h><br>
<br>
class AbsBase {<br>
public:<br>
virtual int f() = 0;<br>
};<br>
<br>
class Derived : public AbsBase {<br>
private:<br>
//int *arr = new int[100];<br>
int arr[100];<br>
public:<br>
int f() { return arr[0]; }<br>
void fillarray() {<br>
arr[0] = 1234;<br>
}<br>
};<br>
<br>
int main() {<br>
AbsBase *absBase = new Derived();<br>
Derived *p = static_cast<Derived*>(absBase);<br>
p->fillarray();<br>
#pragma omp target parallel for map(to: p[0:1])<br>
for (int i=0;i<10;i++) {<br>
//Derived d1(*static_cast<Derived*>(absBase));<br>
Derived d1(*p);<br>
printf("arr[0] is %d\n", d1.f());<br>
}<br>
}<br>
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<div>Above gives me what I wanted to see, but I would like to avoid doing a cast on a pointer</div>
<div>to an abstract base class, but the instantiation is done by the derived class.</div>
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<div dir="ltr" class="gmail_attr">On Fri, Jan 17, 2020 at 6:07 PM Alexey Bataev <<a href="mailto:a.bataev@hotmail.com">a.bataev@hotmail.com</a>> wrote:<br>
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<div dir="auto">AbsBase is a pointer to a base class? Then not, compiler is not aware that it is a pointer to the derived class and copies the array as an array of base class, nit derived one.<br>
<br>
<div dir="ltr">Best regards,
<div>Alexey Bataev</div>
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<div dir="ltr"><br>
<blockquote type="cite">16 янв. 2020 г., в 22:58, Itaru Kitayama <<a href="mailto:itaru.kitayama@gmail.com" target="_blank">itaru.kitayama@gmail.com</a>> написал(а):<br>
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<div>If I change class Derived's private data to an array of 100 integers, it executes, but</div>
<div>the first element of the array is reported as 0, instead of 1234. Shouldn't bitwise copy</div>
<div>work when mapping the pointer to AbsBase class like an array of one? </div>
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<div dir="ltr" class="gmail_attr">On Wed, Jan 15, 2020 at 2:32 PM Alexey Bataev <<a href="mailto:a.bataev@hotmail.com" target="_blank">a.bataev@hotmail.com</a>> wrote:<br>
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<div dir="auto">And it should fail since you're mapping non trivially copyable type.<br>
<br>
<div dir="ltr">Best regards,
<div>Alexey Bataev</div>
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<div dir="ltr"><br>
<blockquote type="cite">14 янв. 2020 г., в 19:14, Itaru Kitayama <<a href="mailto:itaru.kitayama@gmail.com" target="_blank">itaru.kitayama@gmail.com</a>> написал(а):<br>
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<div>This piece of C++ program execution fails at run time.</div>
<div><br>
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#include <stdio.h><br>
<br>
class AbsBase {<br>
public:<br>
virtual int f() = 0;<br>
};<br>
<br>
class Derived : public AbsBase {<br>
private:<br>
int *arr = new int[100];<br>
public:<br>
int f() { return arr[0]; }<br>
void fillarray() {<br>
arr[0] = 1234;<br>
}<br>
};<br>
<br>
int main() {<br>
AbsBase *absBase = new Derived();<br>
static_cast<Derived*>(absBase)->fillarray();<br>
#pragma omp target parallel for map(to: absBase[0:1])<br>
for (int i=0;i<10;i++) {<br>
Derived d1(*static_cast<Derived*>(absBase));<br>
printf("arr[0] is %d\n", d1.f());<br>
}<br>
}<br>
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<div dir="ltr" class="gmail_attr">On Sun, Jan 12, 2020 at 1:45 PM Doerfert, Johannes <<a href="mailto:jdoerfert@anl.gov" target="_blank">jdoerfert@anl.gov</a>> wrote:<br>
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On 01/12, Itaru Kitayama wrote:<br>
> Do you guys have a timeframe for that feature<br>
> Implemented?<br>
<br>
I do not and I don't know anyone who will drive this right now.<br>
<br>
As mentioned before, you should be able to "move/copy-create" the<br>
elements on the device in order to use virtual functions.<br>
<br>
<br>
> On Sun, Jan 12, 2020 at 12:51 Doerfert, Johannes <<a href="mailto:jdoerfert@anl.gov" target="_blank">jdoerfert@anl.gov</a>> wrote:<br>
> <br>
> > On 01/11, Alexey Bataev via Openmp-dev wrote:<br>
> > > Virtual functions are not supported.<br>
> ><br>
> > Not yet ;).<br>
> ><br>
> > We'll get it with 5.1 so we might actually implement it soon. Till then,<br>
> > you have to create the object on the device you call the virtual<br>
> > function.<br>
> ><br>
<br>
-- <br>
<br>
Johannes Doerfert<br>
Researcher<br>
<br>
Argonne National Laboratory<br>
Lemont, IL 60439, USA<br>
<br>
<a href="mailto:jdoerfert@anl.gov" target="_blank">jdoerfert@anl.gov</a><br>
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