HighFive assumes containers have a default ctor.

[1uc]

HighFive needlessly assumes that every container has a default constructor. It happens here:

HighFive/include/highfive/bits/H5Slice_traits_misc.hpp

Lines 161 to 162 in 94ede4f

	T array;
	read(array, xfer_props);

and here (resize isn't safe to use):

HighFive/include/highfive/bits/H5Inspector_misc.hpp

Line 326 in 94ede4f

val.resize(dims[0]);