Add vec explicit conversion #669
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This is change 2 of 9 that fix problems with the specification of the
`vec` class. An implementation that follows the existing specification
would not accept common code patterns and would not pass the CTS. None
of the existing implementations actually follow the existing
specification.
This change adds an explicit conversion when the `vec` has one element,
allowing a conversion to `T` whenever `DataT` can be explicitly
converted to `T`.
This enables code like the following, where the element type `DataT` is
itself a class:
```
sycl::vec<sycl::half, 1> h1;
int i = static_cast<int>(h1);
if (h1) {}
```
These changes correspond to slides 8 - 9 of the presentation that was
discussed in the WG meetings.
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This is change 2 of 9 that fix problems with the specification of the
vecclass. An implementation that follows the existing specification would not accept common code patterns and would not pass the CTS. None of the existing implementations actually follow the existing specification.This change adds an explicit conversion when the
vechas one element, allowing a conversion toTwheneverDataTcan be explicitly converted toT.This enables code like the following, where the element type
DataTis itself a class:These changes correspond to slides 8 - 9 of the presentation that was discussed in the WG meetings.