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41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
//-----------------------------------------------------------------------------
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// boost mpl/test/front.cpp source file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2000-02
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// Aleksey Gurtovoy
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// 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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#include "boost/mpl/front.hpp"
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#include "boost/mpl/list.hpp"
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#include "boost/mpl/list_c.hpp"
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#include "boost/mpl/assert_is_same.hpp"
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#include "boost/static_assert.hpp"
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namespace mpl = boost::mpl;
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int main()
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{
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typedef mpl::list<long>::type types1;
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typedef mpl::list<int,long>::type types2;
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typedef mpl::list<char,int,long>::type types3;
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BOOST_MPL_ASSERT_IS_SAME(mpl::front<types1>::type, long);
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BOOST_MPL_ASSERT_IS_SAME(mpl::front<types2>::type, int);
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BOOST_MPL_ASSERT_IS_SAME(mpl::front<types3>::type, char);
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typedef mpl::list_c<int,1>::type values1;
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typedef mpl::list_c<int,2,1>::type values2;
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typedef mpl::list_c<int,3,2,1>::type values3;
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BOOST_STATIC_ASSERT(mpl::front<values1>::type::value == 1);
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BOOST_STATIC_ASSERT(mpl::front<values2>::type::value == 2);
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BOOST_STATIC_ASSERT(mpl::front<values3>::type::value == 3);
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return 0;
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}
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