Analogue of std::variant written in pure C++14.
Interface is 99% similar to std::variant: https://en.cppreference.com/w/cpp/utility/variant
Besides unittests, we have small library for expressions evaluation, located at
evaluator/.
Expression trees represented by nested nodes, that are built on variants.
You can run bazel run evaluator:calculator to use simple calculator program.
There is also a "dynamic" analogue of expression tree, that is built on abstract classes and virtual method calls.
You can benchmark both approaches by running
bazel run evaluator:evaluator_bench -c opt (don't even try running debug
build binary, please).