thrust::complex divided by int

[kanglcn]

Hi, I find thrust::operator/ (const complex< T0 > & x, const T1 & y) can not handle the case when T0 is float and T1 is int. I have to cast T1 to float explicitly which is not intuitive.

I am working on speeding up my python code with cupy elementwise kernel. I have no experience on c++ before so I cannot provide an example. Sorry about that.

[jrhemstad]

This by design as thrust::complex is intended to be consistent with std::complex: https://godbolt.org/z/d4oGb3xMs

The operator/ is only defined for a complex<T> when dividing by a T scalar:

template< class T >
constexpr std::complex<T> operator/(const std::complex<T>& lhs, const T& rhs );

If you're wondering why the conversion from int to float doesn't happen implicitly, it's because lhs is in a "deduced context", which means the template type T is deduced from the type of rhs and lhs and the T needs to match between the two.

[kanglcn]

Thanks a lot!