ceph/src/boost/libs/type_index/examples/user_defined_typeinfo.cpp

   1 // Copyright 2013-2020 Antony Polukhin
   2
   3 // Distributed under the Boost Software License, Version 1.0.
   4 // (See the accompanying file LICENSE_1_0.txt
   5 // or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
   6
   7
   8 //[type_index_my_type_index_worldwide_macro
   9 /*`
  10     There is an easy way to force `boost::typeindex::type_id` to use your own type_index class.
  11
  12     All we need to do is just define `BOOST_TYPE_INDEX_USER_TYPEINDEX` to the full path to header file
  13     of your type index class:
  14 */
  15
  16 // BOOST_TYPE_INDEX_USER_TYPEINDEX must be defined *BEFORE* first inclusion of <boost/type_index.hpp>
  17 #define BOOST_TYPE_INDEX_USER_TYPEINDEX <boost/../libs/type_index/examples/user_defined_typeinfo.hpp>
  18 #include <boost/type_index.hpp>
  19 //] [/type_index_my_type_index_worldwide_macro]
  20
  21 #include <boost/core/lightweight_test.hpp>
  22 #ifdef assert
  23 #   undef assert
  24 #endif
  25 #define assert(X) BOOST_TEST(X)
  26
  27
  28 using namespace my_namespace;
  29
  30 int main() {
  31 //[type_index_my_type_index_usage
  32 /*`
  33     Finally we can use the my_type_index class for getting type indexes:
  34 */
  35
  36     my_type_index
  37         cl1 = my_type_index::type_id<my_class>(),
  38         st1 = my_type_index::type_id<my_struct>(),
  39         st2 = my_type_index::type_id<my_struct>(),
  40         vec = my_type_index::type_id<my_classes>()
  41     ;
  42
  43     assert(cl1 != st1);
  44     assert(st2 == st1);
  45     assert(vec.pretty_name() == "my_classes");
  46     assert(cl1.pretty_name() == "my_class");
  47
  48 //] [/type_index_my_type_index_usage]
  49
  50 //[type_index_my_type_index_type_id_runtime_test
  51 /*`
  52     Now the following example will compile and work.
  53 */
  54     my_struct str;
  55     my_class& reference = str;
  56     assert(my_type_index::type_id<my_struct>() == my_type_index::type_id_runtime(reference));
  57 //][/type_index_my_type_index_type_id_runtime_test]
  58
  59 //[type_index_my_type_index_worldwide_usage
  60 /*`
  61     That's it! Now all TypeIndex global methods and typedefs will be using your class:
  62 */
  63     boost::typeindex::type_index worldwide = boost::typeindex::type_id<my_classes>();
  64     assert(worldwide.pretty_name() == "my_classes");
  65     assert(worldwide == my_type_index::type_id<my_classes>());
  66 //][/type_index_my_type_index_worldwide_usage]
  67 //<-
  68     return boost::report_errors();
  69 //->
  70 }
  71
  72