Method opaque_ptr

include/function2/function2.hpp:1109–1111

  constexpr internal_capacity_holder() = default;

  FU2_DETAIL_CXX14_CONSTEXPR data_accessor* opaque_ptr() noexcept {
    return &storage_.accessor_;
  }
  constexpr data_accessor const* opaque_ptr() const noexcept {
    return &storage_.accessor_;
  }