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- // Copyright (C) 2009-2012 Lorenzo Caminiti
- // Distributed under the Boost Software License, Version 1.0
- // (see accompanying file LICENSE_1_0.txt or a copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- // Home at http://www.boost.org/libs/utility/identity_type
- #include <boost/utility/identity_type.hpp>
- #include <boost/static_assert.hpp>
- #include <boost/type_traits/is_const.hpp>
- #include <map>
- //[paren
- #define TMP_ASSERT_PAREN(parenthesized_metafunction) \
- /* use `BOOST_IDENTITY_TYPE` in macro definition instead of invocation */ \
- BOOST_STATIC_ASSERT(BOOST_IDENTITY_TYPE(parenthesized_metafunction)::value)
- #define TMP_ASSERT(metafunction) \
- BOOST_STATIC_ASSERT(metafunction::value)
- // Specify only extra parenthesis `((...))`.
- TMP_ASSERT_PAREN((boost::is_const<std::map<int, char> const>));
- // Specify both the extra parenthesis `((...))` and `BOOST_IDENTITY_TYPE` macro.
- TMP_ASSERT(BOOST_IDENTITY_TYPE((boost::is_const<std::map<int, char> const>)));
- //]
- //[paren_always
- TMP_ASSERT_PAREN((boost::is_const<int const>)); // Always extra `((...))`.
- TMP_ASSERT(boost::is_const<int const>); // No extra `((...))` and no macro.
- //]
- int main() { return 0; }
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