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Make sure Grid::Serializable can write Eigen Tensors to output streams. NB:

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1) The Eigen package defines operator<< for Eigen tensors, but this format is different, hence Grid::Serializable::WriteMember
2) For simplification, the contents are written in memory order. I.e. Different results will be obtained depending on whether the tensor is row- or column-major
This commit is contained in:
Michael Marshall 2019-04-06 15:40:23 +01:00
parent 82a77f9960
commit f7b4fd0f69
1 changed files with 21 additions and 1 deletions
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22
Grid/serialisation/BaseIO.h
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@ -583,7 +583,27 @@ namespace Grid {
template <typename T>
static inline typename std::enable_if<EigenIO::is_tensor<T>::value, void>::type
WriteMember(std::ostream &os, const T &object) {
os << "Eigen::Tensor";
using Index = typename T::Index;
const Index NumElements{object.size()};
assert( NumElements > 0 );
Index count = 1;
os << "T<";
for( int i = 0; i < T::NumIndices; i++ ) {
Index dim = object.dimension(i);
count *= dim;
if( i )
os << ",";
os << dim;
}
assert( count == NumElements && "Number of elements doesn't match tensor dimensions" );
os << ">{";
const typename T::Scalar * p = object.data();
for( Index i = 0; i < count; i++ ) {
if( i )
os << ",";
os << *p++;
}
os << "}";
}
};