AMDG Matthias Vallentin wrote:
I am in the process of designing a table-like data structure and would like to hear your feedback on the choice of Fusion for this task. In the context of databases, a table contains multiple columns that exhibit different types (short, unsigned int, long long, etc...). Columns must be added at runtime. The table is column-oriented in that it stores each column individually, yet provides a row-oriented interface to add data. The table structure (aka. schema) remains immutable once all columns have been added.
To benefit from the heterogeneous nature of Fusion, I would consider a table row a fusion::vector, maybe created using fusion::vector_tie from some arbitrary data.
At the very high level, I think of something along the lines of:
<snip> As you can see (at the mark -->), I need to cross at some point the compile-time/runtime boundary but I am having trouble designing that interface. Perhaps boost::variant might help here to bound the potential number of types? Any kind of thoughts are appreciated.
Since the number of columns is determined at runtime, you can't really use
fusion. You're best bet is probably std::vector