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/*=============================================================================
Copyright (c) 1999-2003 Jaakko Jarvi
Copyright (c) 2001-2011 Joel de Guzman
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#include <boost/detail/lightweight_test.hpp>
#include <boost/fusion/sequence/intrinsic/at.hpp>
#include <boost/fusion/sequence/intrinsic/value_at.hpp>
#include <boost/static_assert.hpp>
#include <iostream>
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
#include <functional>
#endif
#if !defined(FUSION_AT)
#define FUSION_AT at_c
#endif
#if !defined(FUSION_VALUE_AT)
#define FUSION_VALUE_AT(S, N) boost::fusion::result_of::value_at_c<S, N>
#endif
namespace test_detail
{
// something to prevent warnings for unused variables
template<class T> void dummy(const T&) {}
class A {};
}
void
test()
{
using namespace boost::fusion;
using namespace test_detail;
double d = 2.7;
A a;
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
// Note: C++11 will pickup the rvalue overload for the d argument
// since we do not have all permutations (expensive!) for all const&
// and && arguments. We either have all && or all const& arguments only.
// For that matter, use std::ref to disambiguate the call.
FUSION_SEQUENCE<int, double&, const A&, int> t(1, std::ref(d), a, 2);
#else
FUSION_SEQUENCE<int, double&, const A&, int> t(1, d, a, 2);
#endif
const FUSION_SEQUENCE<int, double&, const A, int> ct(t);
int i = FUSION_AT<0>(t);
int i2 = FUSION_AT<3>(t);
BOOST_TEST(i == 1 && i2 == 2);
int j = FUSION_AT<0>(ct);
BOOST_TEST(j == 1);
FUSION_AT<0>(t) = 5;
BOOST_TEST(FUSION_AT<0>(t) == 5);
#if defined(FUSION_TEST_FAIL)
FUSION_AT<0>(ct) = 5; // can't assign to const
#endif
double e = FUSION_AT<1>(t);
BOOST_TEST(e > 2.69 && e < 2.71);
FUSION_AT<1>(t) = 3.14+i;
BOOST_TEST(FUSION_AT<1>(t) > 4.13 && FUSION_AT<1>(t) < 4.15);
#if defined(FUSION_TEST_FAIL)
FUSION_AT<4>(t) = A(); // can't assign to const
dummy(FUSION_AT<5>(ct)); // illegal index
#endif
++FUSION_AT<0>(t);
BOOST_TEST(FUSION_AT<0>(t) == 6);
typedef FUSION_SEQUENCE<int, float> seq_type;
BOOST_STATIC_ASSERT(!(
boost::is_const<FUSION_VALUE_AT(seq_type, 0)::type>::value));
// constness should not affect
BOOST_STATIC_ASSERT(!(
boost::is_const<FUSION_VALUE_AT(const seq_type, 0)::type>::value));
BOOST_STATIC_ASSERT(!(
boost::is_const<FUSION_VALUE_AT(seq_type, 1)::type>::value));
// constness should not affect
BOOST_STATIC_ASSERT(!(
boost::is_const<FUSION_VALUE_AT(const seq_type, 1)::type>::value));
dummy(i); dummy(i2); dummy(j); dummy(e); // avoid warns for unused variables
}
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