Performance observations on a C++ vector of lambdas

A benchmarking study comparing compile-time and runtime performance of storing C++ lambdas in a std::vector using two approaches: std::function<> and a hand-crafted virtual interface with std::unique_ptr<>. Key findings: std::function<> takes roughly 2-3x longer to compile than the custom interface approach, and with clang++3.6 using emplace_back() with optimizations enabled, compile time explodes to 338 seconds. At runtime, std::function<> is actually faster to call, likely due to better cache locality from small-buffer optimization. emplace_back() provides no meaningful runtime benefit over push_back() in this scenario, and actually hurts compile times significantly.