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https://github.com/boostorg/fusion.git
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88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
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/*=============================================================================
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Copyright (c) 1999-2003 Jaakko J<EFBFBD>rvi
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Copyright (c) 2001-2006 Joel de Guzman
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Use, modification and distribution is 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/sequence/intrinsic/at.hpp>
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#include <boost/fusion/sequence/intrinsic/value_at.hpp>
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#include <boost/static_assert.hpp>
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#include <iostream>
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#if !defined(FUSION_AT)
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#define FUSION_AT at_c
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#endif
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#if !defined(FUSION_VALUE_AT)
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#define FUSION_VALUE_AT(S, N) result_of::value_at_c<S, N>
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#endif
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namespace
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{
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// something to prevent warnings for unused variables
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template<class T> void dummy(const T&) {}
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class A {};
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}
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void
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test()
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{
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using namespace boost::fusion;
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double d = 2.7;
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A a;
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FUSION_SEQUENCE<int, double&, const A&, int> t(1, d, a, 2);
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const FUSION_SEQUENCE<int, double&, const A, int> ct(t);
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int i = FUSION_AT<0>(t);
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int i2 = FUSION_AT<3>(t);
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BOOST_TEST(i == 1 && i2 == 2);
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int j = FUSION_AT<0>(ct);
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BOOST_TEST(j == 1);
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FUSION_AT<0>(t) = 5;
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BOOST_TEST(FUSION_AT<0>(t) == 5);
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#if defined(FUSION_TEST_FAIL)
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FUSION_AT<0>(ct) = 5; // can't assign to const
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#endif
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double e = FUSION_AT<1>(t);
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BOOST_TEST(e > 2.69 && e < 2.71);
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FUSION_AT<1>(t) = 3.14+i;
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BOOST_TEST(FUSION_AT<1>(t) > 4.13 && FUSION_AT<1>(t) < 4.15);
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#if defined(FUSION_TEST_FAIL)
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FUSION_AT<4>(t) = A(); // can't assign to const
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dummy(FUSION_AT<5>(ct)); // illegal index
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#endif
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++FUSION_AT<0>(t);
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BOOST_TEST(FUSION_AT<0>(t) == 6);
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typedef FUSION_SEQUENCE<int, float> seq_type;
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BOOST_STATIC_ASSERT(!(
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boost::is_const<FUSION_VALUE_AT(seq_type, 0)::type>::value));
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// constness should not affect
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BOOST_STATIC_ASSERT(!(
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boost::is_const<FUSION_VALUE_AT(const seq_type, 0)::type>::value));
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BOOST_STATIC_ASSERT(!(
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boost::is_const<FUSION_VALUE_AT(seq_type, 1)::type>::value));
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// constness should not affect
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BOOST_STATIC_ASSERT(!(
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boost::is_const<FUSION_VALUE_AT(const seq_type, 1)::type>::value));
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dummy(i); dummy(i2); dummy(j); dummy(e); // avoid warns for unused variables
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}
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