a525aab0f4
Also, add tests to validate that `hana::tuple` containing an array can't be constructed from an array, per the standard. Related to #365.
62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
// Copyright Louis Dionne 2013-2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/accessors.hpp>
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#include <boost/hana/adapt_struct.hpp>
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#include <boost/hana/assert.hpp>
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#include <boost/hana/at.hpp>
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#include <boost/hana/define_struct.hpp>
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#include <boost/hana/second.hpp>
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#include <cstddef>
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#include <type_traits>
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namespace hana = boost::hana;
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//
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// This test makes sure that `hana::accessors` does not decay C-style array
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// members to pointers.
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//
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struct Foo {
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float array[3];
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};
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BOOST_HANA_ADAPT_STRUCT(Foo,
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array
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);
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template <std::size_t N>
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using FloatArray = float[N];
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struct Bar {
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BOOST_HANA_DEFINE_STRUCT(Bar,
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(FloatArray<3>, array)
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);
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};
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int main() {
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{
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Foo foo = {{1.0f, 2.0f, 3.0f}};
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auto accessors = hana::accessors<Foo>();
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auto get_array = hana::second(hana::at_c<0>(accessors));
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static_assert(std::is_same<decltype(get_array(foo)), float(&)[3]>{}, "");
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float (&array)[3] = get_array(foo);
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BOOST_HANA_RUNTIME_CHECK(array[0] == 1.0f);
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BOOST_HANA_RUNTIME_CHECK(array[1] == 2.0f);
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BOOST_HANA_RUNTIME_CHECK(array[2] == 3.0f);
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}
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{
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Bar bar = {{1.0f, 2.0f, 3.0f}};
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auto accessors = hana::accessors<Bar>();
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auto get_array = hana::second(hana::at_c<0>(accessors));
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static_assert(std::is_same<decltype(get_array(bar)), float(&)[3]>{}, "");
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float (&array)[3] = get_array(bar);
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BOOST_HANA_RUNTIME_CHECK(array[0] == 1.0f);
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BOOST_HANA_RUNTIME_CHECK(array[1] == 2.0f);
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BOOST_HANA_RUNTIME_CHECK(array[2] == 3.0f);
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}
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}
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