Method ParamIterator

tests/gtest/gtest.h:10522–10522

ParamIterator assumes ownership of the impl_ pointer.

  // ParamIterator assumes ownership of the impl_ pointer.
  ParamIterator(const ParamIterator& other) : impl_(other.impl_->Clone()) {}
  ParamIterator& operator=(const ParamIterator& other) {
    if (this != &other)
      impl_.reset(other.impl_->Clone());