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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 <boost/hana/core/to.hpp>
- #include <boost/hana/core/when.hpp>
- #include <vector>
- namespace hana = boost::hana;
- namespace boost { namespace hana {
- template <typename To, typename From>
- struct to_impl<std::vector<To>, std::vector<From>,
- when<is_convertible<From, To>::value>>
- : embedding<is_embedded<From, To>::value>
- {
- static std::vector<To> apply(std::vector<From> const& xs) {
- std::vector<To> result;
- for (auto const& x: xs)
- result.push_back(to<To>(x));
- return result;
- }
- };
- }}
- int main() {
- BOOST_HANA_RUNTIME_CHECK(
- hana::to<std::vector<int>>(std::vector<float>{1.1, 2.2, 3.3})
- ==
- std::vector<int>{1, 2, 3}
- );
- static_assert(!hana::is_embedded<std::vector<float>, std::vector<int>>{}, "");
- }
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