Is it common to define a template class only in a header?

• etl

  3 212 9.3 C++

  Blazing-fast Expression Templates Library (ETL) with GPU support, in C++ (by wichtounet)

There are also countless libraries that do this. Check out ETL as an example. Notice that yea, you might have some trouble compiling this in parallel, but generally when you work with codebases over a million lines, you are compiling multiple binaries, which CAN be compiled in parallel. And since you only ever include things once, you technically don't need the pragma in your headers (though I usually put it or include guards there just to be nice). Additionally, it's less work for your preprocessor and compiler since it has fewer includes to process, and it doesn't need to deal with the forward declarations we normally paste all over the place with .h/.cpp architectures. Of course, main.cpp takes a hot minute to compile. But it also doesn't need to compile other cpp files in this binary, so it does benefit from that.

• InfluxDB

  www.influxdata.com featured

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

Suggest a related project