mkdir build && cd build
cmake .. && cmake --build .
./demoexpected_util.hpp— Pipe (|) + adapters and tee helpersdomain_error.hpp—DomainError(code + source + context)net_error.hpp/db_error.hpp— subdomain error categoriesservice.hpp— boundary mapping + business flowdemo.cpp— usage with tee_both/tee_error and transform_f