5906d9c316
- Construct from elements is enabled iff each argument is_convertible to
corresponding element.
- Construct from sequence is enabled iff the single argument is a fusion
sequence.
- C++11 vector and tuple also disable construct from sequence that are
shorter than the destination. C++03 gives incorrect is_convertible
responses in this situation and fails to compile if that constructor is
used; C++11 can have instantation errors in
and_<is_convertible<U, T>...> without the additional check.
- C++11 tuple and vector support truncation conversion and assignment like
all other sequences.
52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
/*=============================================================================
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Copyright (c) 2016 Lee Clagett
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Use modification and distribution are subject to the Boost Software
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License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt).
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==============================================================================*/
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#include <boost/detail/lightweight_test.hpp>
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#include <boost/fusion/tuple.hpp>
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#define FUSION_SEQUENCE boost::fusion::tuple
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#include "conversion.hpp"
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// Bug in C++03 tuple? Cannot construct from a std::pair without including
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// std::pair fusion adaption
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#if !defined(BOOST_FUSION_HAS_VARIADIC_TUPLE)
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# include <boost/fusion/adapted/std_pair.hpp>
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#endif
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using namespace test_detail;
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void test_tuple()
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{
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BOOST_TEST((
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run< can_copy< boost::fusion::tuple<int, int> > >(
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std::pair<int, int>(1, 9)
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)
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));
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BOOST_TEST((
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run< can_copy< boost::fusion::tuple<int, convertible> > >(
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std::pair<int, int>(1, 9)
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)
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));
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BOOST_TEST((
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run< can_copy< boost::fusion::tuple<convertible, int> > >(
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std::pair<int, int>(1, 9)
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)
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));
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BOOST_TEST((
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run< can_copy< boost::fusion::tuple<convertible, convertible> > >(
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std::pair<int, int>(1, 9)
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)
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));
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}
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int main()
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{
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test<can_assign>(); // conversion construction not supported
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test_tuple();
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return boost::report_errors();
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}
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