C offers various methods for iterating through the members of structs and classes, enabling in-depth exploration of their internal elements.
One technique involves utilizing the REFLECTABLE macro. By incorporating REFLECTABLE into the struct definition, as shown below, the fields become accessible for interrogation:
<code class="cpp">struct A { REFLECTABLE ( (int) a, (int) b, (int) c ) };</code>
Utilizing this macro, you can traverse each field and print its value:
<code class="cpp">struct print_visitor { template<class FieldData> void operator()(FieldData f) { std::cout << f.name() << "=" << f.get() << std::endl; } }; template<class T> void print_fields(T & x) { visit_each(x, print_visitor()); } A x; print_fields(x);</code>
Alternatively, you can adapt structs as fusion sequences using Boost.Fusion. Here's an example:
<code class="cpp">struct A { int a; int b; int c; }; BOOST_FUSION_ADAPT_STRUCT ( A, (int, a) (int, b) (int, c) )</code>
Similar to the REFLECTABLE method, you can print the fields:
<code class="cpp">struct print_visitor { template<class Index, class C> void operator()(Index, C & c) { std::cout << boost::fusion::extension::struct_member_name<C, Index::value>::call() << "=" << boost:::fusion::at<Index>(c) << std::endl; } }; template<class C> void print_fields(C & c) { typedef boost::mpl::range_c<int,0, boost::fusion::result_of::size<C>::type::value> range; boost::mpl::for_each<range>(boost::bind<void>(print_visitor(), boost::ref(c), _1)); }</code>
The above is the detailed content of How can I iterate through the members of structs and classes in C ?. For more information, please follow other related articles on the PHP Chinese website!