ctbench: Compiler-assisted benchmarking for the study of C++ metaprogram compile times

Compiler-assisted variable size benchmarking for the study of C++ metaprogram compile times.

ctbench provides developer-friendly tools to generate C++ compiler execution time benchmarks, run them through CMake, then gather, wrangle, and plot the data from Clang's builtin profiler. It is the only tool that allows profiler-level compile time benchmark declaration and analysis for the study of C++ code generation scaling.