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Evaluate tensorstoreToITKComponentType at compile-time, using constexpr #68

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Evaluate tensorstoreToITKComponentType at compile-time, using constexpr #68

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63c4d91
STYLE: Declare component type conversion functions constexpr
N-Dekker Aug 20, 2024
6678cc4
PERF: Call tensorstoreToITKComponentType at compile-time, by constexpr
N-Dekker Aug 20, 2024
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4 changes: 2 additions & 2 deletions src/itkOMEZarrNGFFImageIO.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -135,7 +135,7 @@ OMEZarrNGFFImageIO::PrintSelf(std::ostream & os, Indent indent) const
os << indent << "ChannelIndex: " << m_ChannelIndex << std::endl;
}

IOComponentEnum
constexpr IOComponentEnum
tensorstoreToITKComponentType(const tensorstore::DataType dtype)
{
switch (dtype.id())
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Interesting compile errors from Ubuntu/GCC, https://open.cdash.org/viewBuildError.php?buildid=9845800 at this particular dtype.id() call:

itkOMEZarrNGFFImageIO.cxx: In instantiation of 'constexpr const IOComponentEnum itk::toITKComponentType<float>':
itkOMEZarrNGFFImageIO.cxx:643:3:   required from here
itkOMEZarrNGFFImageIO.cxx:251:84:   in 'constexpr' expansion of 'itk::tensorstoreToITKComponentType(tensorstore::dtype_v<float>.tensorstore::StaticDataType<float>::operator tensorstore::DataType())'
itkOMEZarrNGFFImageIO.cxx:141:19:   in 'constexpr' expansion of 'dtype.tensorstore::DataType::id()'
itkOMEZarrNGFFImageIO.cxx:251:34: error: the value of 'tensorstore::internal_data_type::MakeDataTypeOperations<float>::operations' is not usable in a constant expression

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Just fixed, by google/tensorstore@91ea2a2 😃

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Let's get #72 and #73 in before we try updating version of tensorstore we use. Or do you want to try that right away Niels?

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Let's get #72 and #73 in before we try updating version of tensorstore we use.

Sounds like a plan 👍

Or do you want to try that right away Niels?

No, this one (#68) can wait a little longer, no problem!

Expand Down Expand Up @@ -177,7 +177,7 @@ tensorstoreToITKComponentType(const tensorstore::DataType dtype)
}
}

tensorstore::DataType
constexpr tensorstore::DataType
itkToTensorstoreComponentType(const IOComponentEnum itkComponentType)
{
switch (itkComponentType)
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