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// Copyright 2013-2025 Antony Polukhin
// Distributed under the Boost Software License, Version 1.0.
// (See the accompanying file LICENSE_1_0.txt
// or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
//[type_index_registry_example
/*`
The following example shows how an information about a type could be stored.
Example works with and without RTTI.
*/
#include <boost/type_index.hpp>
#include <boost/unordered/unordered_set.hpp>
//<-
// Making `#include <cassert>` visible in docs, while actually using `BOOST_TEST`
// instead of `assert`. This is required to verify correct behavior even if NDEBUG
// is defined and to avoid `unused local variable` warnings with defined NDEBUG.
//
// boost-no-inspect
#include <boost/core/lightweight_test.hpp>
#ifdef assert
# undef assert
#endif
#define assert(X) BOOST_TEST(X)
/* !Comment block is not closed intentionaly!
//->
#include <cassert>
//<-
!Closing comment block! */
//->
int main() {
boost::unordered_set<boost::typeindex::type_index> types;
// Storing some `boost::type_info`s
types.insert(boost::typeindex::type_id<int>());
types.insert(boost::typeindex::type_id<float>());
// `types` variable contains two `boost::type_index`es:
assert(types.size() == 2);
// Const, volatile and reference will be striped from the type:
bool is_inserted = types.insert(boost::typeindex::type_id<const int>()).second;
assert(!is_inserted);
assert(types.erase(boost::typeindex::type_id<float&>()) == 1);
// We have erased the `float` type, only `int` remains
assert(*types.begin() == boost::typeindex::type_id<int>());
//<-
return boost::report_errors();
//->
}
//] [/type_index_registry_example]
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