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43 lines
1.5 KiB
C++
43 lines
1.5 KiB
C++
//-----------------------------------------------------------------------------
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// boost mpl/test/always.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/always.hpp"
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#include "boost/mpl/bool.hpp"
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#include "boost/mpl/int.hpp"
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#include "boost/mpl/apply.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::always<mpl::true_> always_true;
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typedef mpl::apply1< always_true,mpl::false_ >::type res1;
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typedef mpl::apply2< always_true,mpl::false_,mpl::false_ >::type res2;
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typedef mpl::apply3< always_true,mpl::false_,mpl::false_,mpl::false_ >::type res3;
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BOOST_STATIC_ASSERT(res1::value == true);
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BOOST_STATIC_ASSERT(res2::value == true);
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BOOST_STATIC_ASSERT(res3::value == true);
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typedef mpl::always< mpl::int_<10> > always_10;
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typedef mpl::apply1< always_10,mpl::int_<0> >::type res4;
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typedef mpl::apply2< always_10,mpl::int_<0>,mpl::int_<0> >::type res5;
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typedef mpl::apply3< always_10,mpl::int_<0>,mpl::int_<0>,mpl::int_<0> >::type res6;
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BOOST_STATIC_ASSERT(res4::value == 10);
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BOOST_STATIC_ASSERT(res5::value == 10);
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BOOST_STATIC_ASSERT(res6::value == 10);
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return 0;
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}
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