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- // Copyright Louis Dionne 2013-2017
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- #include <boost/hana/assert.hpp>
- #include <support/cnumeric.hpp>
- namespace hana = boost::hana;
- template <bool value>
- auto constant_bool() { return make_cnumeric<bool, value>(); }
- template <bool value>
- constexpr auto constexpr_constant_bool() { return make_cnumeric<bool, value>(); }
- // Make sure it works at global scope
- BOOST_HANA_CONSTANT_ASSERT(constant_bool<true>());
- BOOST_HANA_CONSTANT_ASSERT_MSG(constant_bool<true>(), "message");
- // Make sure it works at namespace scope
- namespace ns {
- BOOST_HANA_CONSTANT_ASSERT(constant_bool<true>());
- BOOST_HANA_CONSTANT_ASSERT_MSG(constant_bool<true>(), "message");
- }
- // Make sure it works in a constexpr context
- constexpr bool constexpr_context() {
- BOOST_HANA_CONSTANT_ASSERT(constexpr_constant_bool<true>());
- BOOST_HANA_CONSTANT_ASSERT_MSG(constexpr_constant_bool<true>(), "message");
- return true;
- }
- static_assert(constexpr_context(), "");
- int main() {
- // Make sure it works at function scope
- BOOST_HANA_CONSTANT_ASSERT(constant_bool<true>());
- BOOST_HANA_CONSTANT_ASSERT_MSG(constant_bool<true>(), "message");
- // Make sure it works inside a lambda
- auto lambda = []{
- BOOST_HANA_CONSTANT_ASSERT(constant_bool<true>());
- BOOST_HANA_CONSTANT_ASSERT_MSG(constant_bool<true>(), "message");
- };
- lambda();
- // Make sure we can reference a local variable
- auto yes = constant_bool<true>();
- BOOST_HANA_CONSTANT_ASSERT(yes);
- BOOST_HANA_CONSTANT_ASSERT_MSG(yes, "message");
- }
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