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1 | // Copyright 2013-2017 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 | //[type_index_registry_example | |
8 | /*` | |
9 | The following example shows how an information about a type could be stored. | |
10 | Example works with and without RTTI. | |
11 | */ | |
12 | ||
13 | #include <boost/type_index.hpp> | |
14 | #include <boost/unordered_set.hpp> | |
15 | //<- | |
16 | // Making `#include <cassert>` visible in docs, while actually using `BOOST_TEST` | |
17 | // instead of `assert`. This is required to verify correct behavior even if NDEBUG | |
18 | // is defined and to avoid `unused local variable` warnings with defined NDEBUG. | |
19 | #include <boost/core/lightweight_test.hpp> | |
20 | #ifdef assert | |
21 | # undef assert | |
22 | #endif | |
23 | #define assert(X) BOOST_TEST(X) | |
24 | /* !Comment block is not closed intentionaly! | |
25 | //-> | |
26 | #include <cassert> | |
27 | //<- | |
28 | !Closing comment block! */ | |
29 | //-> | |
30 | ||
31 | int main() { | |
32 | boost::unordered_set<boost::typeindex::type_index> types; | |
33 | ||
34 | // Storing some `boost::type_info`s | |
35 | types.insert(boost::typeindex::type_id<int>()); | |
36 | types.insert(boost::typeindex::type_id<float>()); | |
37 | ||
38 | // `types` variable contains two `boost::type_index`es: | |
39 | assert(types.size() == 2); | |
40 | ||
41 | // Const, volatile and reference will be striped from the type: | |
42 | bool is_inserted = types.insert(boost::typeindex::type_id<const int>()).second; | |
43 | assert(!is_inserted); | |
44 | assert(types.erase(boost::typeindex::type_id<float&>()) == 1); | |
45 | ||
46 | // We have erased the `float` type, only `int` remains | |
47 | assert(*types.begin() == boost::typeindex::type_id<int>()); | |
48 | } | |
49 | ||
50 | //] [/type_index_registry_example] |