sycl::gpu_selector_v, Select sycl gpu device. c++

#include <sycl/sycl.hpp>

int main()
{
	auto device = sycl::device{sycl::gpu_selector_v};
}

dpcpp test.cpp -std=c++23 -o test

Got it without documentations and reading source code

c++:

#include <sycl/sycl.hpp>
#include <iostream>

int main()
{
	using type_t90 = decltype(sycl::gpu_selector_v);
	static_assert(std::same_as<type_t90, void>);
}

Compile, it reports error:

***
error: static assertion failed
***
*** because '__detail::__same_as<int (const sycl::device &), void>' evaluated to false ***

So, we know the type of sycl::gpu_selector_v is int (const sycl::device &) .

Make that type:

#include <sycl/sycl.hpp>
#include <iostream>

namespace my_gpu
{

class my_gpu_selector_v
{
public:
	int operator()(const sycl::device & device__) const
	{
		std::cout << "c++ GPU" << std::endl;
		return sycl::gpu_selector_v(device__);
	}
};

}

int main()
{
	auto device = sycl::device{my_gpu::my_gpu_selector_v{}};
}

Compile and run the code:

$ dpcpp test.cpp -std=c++23 -o test
$ ./test
c++ GPU
c++ GPU

Em, c++ sycl is funny.

____

Dec 20, 2024

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c++ std::exception:

std::cout.write(err.data(), err.size());

std::cout << std::endl;

caught:

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