Method start

src/ifcgeom/taxonomy.cpp:500–500

const piecewise_function::spans_t& piecewise_function::spans() const { return spans_; }
bool piecewise_function::is_empty() const { return spans_.empty(); }
double piecewise_function::start() const { return start_; }
double piecewise_function::end() const { return start_ + length(); }
double piecewise_function::length() const {
    return std::accumulate(spans_.begin(), spans_.end(), 0.0, [](const auto& v, const auto& s) { return v + s->length(); });