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78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
//-----------------------------------------------------------------------------
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// boost mpl/test/lambda.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) 2001-02
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// Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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#include "boost/mpl/logical.hpp"
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#include "boost/mpl/comparison.hpp"
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#include "boost/mpl/lambda.hpp"
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#include "boost/mpl/int_c.hpp"
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#include "boost/mpl/bool_c.hpp"
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#include "boost/mpl/size_of.hpp"
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#include "boost/type_traits/is_same.hpp"
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#include "boost/type_traits/is_float.hpp"
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#include "boost/static_assert.hpp"
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namespace mpl = boost::mpl;
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struct my
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{
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char a[100];
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};
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int main()
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{
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using namespace mpl::placeholder;
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// !(x == char) && !(x == double) && x convertible to int || size_of(x) > 8
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typedef mpl::lambda<
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mpl::logical_or<
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mpl::logical_and<
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mpl::logical_not< boost::is_same<_1, char> >
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, mpl::logical_not< boost::is_float<_1> >
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>
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, mpl::greater< mpl::size_of<_1>, mpl::int_c<8> >
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>
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>::type f1;
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BOOST_STATIC_ASSERT(!f1::apply<char>::type::value);
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BOOST_STATIC_ASSERT(!f1::apply<double>::type::value);
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BOOST_STATIC_ASSERT(f1::apply<long>::type::value);
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BOOST_STATIC_ASSERT(f1::apply<my>::type::value);
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// x == y || x == my || sizeof(x) == sizeof(y)
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typedef mpl::lambda<
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mpl::logical_or<
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boost::is_same<_1, _2>
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, boost::is_same<_2, my>
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, mpl::equal_to< mpl::size_of<_1>, mpl::size_of<_2> >
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>
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>::type f2;
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BOOST_STATIC_ASSERT((!f2::apply<double,char>::type::value));
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BOOST_STATIC_ASSERT((!f2::apply<my,int>::type::value));
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BOOST_STATIC_ASSERT((!f2::apply<my,char[99]>::type::value));
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BOOST_STATIC_ASSERT((f2::apply<int,int>::type::value));
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BOOST_STATIC_ASSERT((f2::apply<my,my>::type::value));
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BOOST_STATIC_ASSERT((f2::apply<signed long, unsigned long>::type::value));
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// bind <-> lambda interaction
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typedef mpl::lambda< mpl::less<_1,_2> >::type pred;
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typedef mpl::bind2< pred, _1, mpl::int_c<4> > f3;
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BOOST_STATIC_ASSERT((f3::apply< mpl::int_c<3> >::type::value));
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return 0;
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}
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