117 lines
2.9 KiB
C++
117 lines
2.9 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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// noinvoke.hpp
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/proto/core.hpp>
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#include <boost/proto/transform/make.hpp>
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#include <boost/type_traits/add_pointer.hpp>
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#include <boost/type_traits/remove_pointer.hpp>
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#include <boost/test/unit_test.hpp>
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namespace proto=boost::proto;
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using proto::_;
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struct Test
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: proto::when<
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_
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, proto::noinvoke<
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// This remove_pointer invocation is bloked by noinvoke
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boost::remove_pointer<
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// This add_pointer invocation is *not* blocked by noinvoke
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boost::add_pointer<_>
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>
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>()
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>
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{};
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struct Test2
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: proto::when<
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_
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// This add_pointer gets invoked because a substitution takes place
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// within it.
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, boost::add_pointer<
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proto::noinvoke<
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// This remove_pointer invocation is bloked by noinvoke
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boost::remove_pointer<
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// This add_pointer invocation is *not* blocked by noinvoke
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boost::add_pointer<_>
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>
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>
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>()
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>
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{};
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template<typename T, typename U>
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struct select2nd
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{
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typedef U type;
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};
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struct Test3
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: proto::when<
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_
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// This add_pointer gets invoked because a substitution takes place
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// within it.
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, select2nd<
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void
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, proto::noinvoke<
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// This remove_pointer invocation is bloked by noinvoke
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select2nd<
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void
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// This add_pointer invocation is *not* blocked by noinvoke
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, boost::add_pointer<_>
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>
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>
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>()
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>
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{};
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void test_noinvoke()
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{
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typedef proto::terminal<int>::type Int;
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Int i = {42};
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BOOST_MPL_ASSERT((
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boost::is_same<
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boost::result_of<Test(Int)>::type
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, boost::remove_pointer<Int *>
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>
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));
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boost::remove_pointer<Int *> t = Test()(i);
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BOOST_MPL_ASSERT((
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boost::is_same<
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boost::result_of<Test2(Int)>::type
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, boost::remove_pointer<Int *> *
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>
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));
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boost::remove_pointer<Int *> * t2 = Test2()(i);
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BOOST_MPL_ASSERT((
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boost::is_same<
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boost::result_of<Test3(Int)>::type
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, select2nd<void, Int *>
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>
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));
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select2nd<void, Int *> t3 = Test3()(i);
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}
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using namespace boost::unit_test;
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///////////////////////////////////////////////////////////////////////////////
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// init_unit_test_suite
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//
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test_suite* init_unit_test_suite( int argc, char* argv[] )
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{
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test_suite *test = BOOST_TEST_SUITE("test proto::noinvoke");
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test->add(BOOST_TEST_CASE(&test_noinvoke));
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return test;
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}
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