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Diffstat (limited to 'src/boost/libs/hana/test/map/at_key.ref.cpp')
-rw-r--r-- | src/boost/libs/hana/test/map/at_key.ref.cpp | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/map/at_key.ref.cpp b/src/boost/libs/hana/test/map/at_key.ref.cpp new file mode 100644 index 000000000..c845bc134 --- /dev/null +++ b/src/boost/libs/hana/test/map/at_key.ref.cpp @@ -0,0 +1,84 @@ +// 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/at_key.hpp> +#include <boost/hana/integral_constant.hpp> +#include <boost/hana/map.hpp> +#include <boost/hana/pair.hpp> + +#include <utility> +namespace hana = boost::hana; + + +template <typename T> +T const& cref(T& t) { return t; } + +int main() { + // using at_key + { + auto xs = hana::make_map( + hana::make_pair(hana::int_c<0>, 0), + hana::make_pair(hana::int_c<1>, '1'), + hana::make_pair(hana::int_c<2>, 2.2) + ); + + // Make sure we return lvalue-references + BOOST_HANA_RUNTIME_CHECK(hana::at_key(xs, hana::int_c<0>) == 0); + BOOST_HANA_RUNTIME_CHECK(hana::at_key(xs, hana::int_c<1>) == '1'); + BOOST_HANA_RUNTIME_CHECK(hana::at_key(xs, hana::int_c<2>) == 2.2); + + int& a = hana::at_key(xs, hana::int_c<0>); + char& b = hana::at_key(xs, hana::int_c<1>); + double& c = hana::at_key(xs, hana::int_c<2>); + a = 9; + b = '9'; + c = 9.9; + + // Make sure we return lvalue-references to const on a const map + int const& ca = hana::at_key(cref(xs), hana::int_c<0>); + char const& cb = hana::at_key(cref(xs), hana::int_c<1>); + double const& cc = hana::at_key(cref(xs), hana::int_c<2>); + + BOOST_HANA_RUNTIME_CHECK(ca == 9); + BOOST_HANA_RUNTIME_CHECK(cb == '9'); + BOOST_HANA_RUNTIME_CHECK(cc == 9.9); + } + + // using operator[] + { + auto xs = hana::make_map( + hana::make_pair(hana::int_c<0>, 0), + hana::make_pair(hana::int_c<1>, '1'), + hana::make_pair(hana::int_c<2>, 2.2) + ); + + BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<0>] == 0); + BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<1>] == '1'); + BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<2>] == 2.2); + + xs[hana::int_c<0>] = 9; + xs[hana::int_c<1>] = '9'; + xs[hana::int_c<2>] = 9.9; + + BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<0>] == 9); + BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<1>] == '9'); + BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<2>] == 9.9); + } + + // Make sure we return a rvalue-reference from a temporary map + // (https://github.com/boostorg/hana/issues/90) + { + auto xs = hana::make_map( + hana::make_pair(hana::int_c<0>, 0), + hana::make_pair(hana::int_c<1>, '1'), + hana::make_pair(hana::int_c<2>, 2.2) + ); + + char&& c = hana::at_key(std::move(xs), hana::int_c<1>); + BOOST_HANA_RUNTIME_CHECK(hana::at_key(xs, hana::int_c<1>) == '1'); + c = '9'; + BOOST_HANA_RUNTIME_CHECK(hana::at_key(xs, hana::int_c<1>) == '9'); + } +} |