Method operator()

src/backward.h:846–853

class Unwinder {
public:
    size_t operator()(F& f, size_t depth)
    {
        _f = &f;
        _index = -1;
        _depth = depth;
        _Unwind_Backtrace(&this->backtrace_trampoline, this);
        return static_cast<size_t>(_index);
    }

private:
    F* _f;