Function registerStep

include/cucumber-cpp/internal/step/StepManager.hpp:193–197

template<class T>
static int registerStep(const std::string& stepMatcher, const char* file, const int line) {
    return StepManager::addStep(
        std::make_shared<StepInvoker<T>>(stepMatcher, toSourceString(file, line))
    );
}

template<typename T>
T fromString(const std::string& s) {