#633 C++20 compilation errors

[Andrew Kirmse]

I am migrating my codebase to C++20 via the -std:c++20 flag to MSVC. This gives the following compilation error in OWLNext 7.0.19:

• [source/owlcore/dib.cpp(343)]
  error C2666: 'owl::TColor::operator ==': overloaded functions have similar conversions
  • [include/owl/color.h(629)]
    note: could be 'bool owl::TColor::operator ==(const owl::TColor &) const'
  • [include/owl/color.h(829)]
    note: or 'bool owl::TRgbQuad::operator ==(COLORREF) const' [synthesized expression 'y == x']
  • [source/owlcore/dib.cpp(343)]
    note: while trying to match the argument list '(const owl::TColor, owl::TRgbQuad)'

I can sort of work around it by commenting out some of these operators, but that's clearly not the right solution.

[Vidar Hasfjord]

Hi Andrew,

Version 7 is based on C++17.

But the trunk has already transitioned to C++20.

See Roadmap | Version 8.

[Andrew Kirmse]

@vattila wrote:

The way to deal with an error like this is to homogenise the arguments to
the comparison operator.

Thanks, yes, that's what I ultimately did.

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