| 3841 | return m_cache; |
| 3842 | } |
| 3843 | bool next() override { |
| 3844 | const auto success = m_generator.next(); |
| 3845 | if (success) { |
| 3846 | m_cache = m_function(m_generator.get()); |
| 3847 | } |
| 3848 | return success; |
| 3849 | } |
| 3850 | }; |
| 3851 | |
| 3852 | #if defined(__cpp_lib_is_invocable) && __cpp_lib_is_invocable >= 201703 |