| 1 | /////////////////////////////////////////////////////////////////////////////// |
| 2 | // noinvoke.hpp |
| 3 | // |
| 4 | // Copyright 2008 Eric Niebler. Distributed under the Boost |
| 5 | // Software License, Version 1.0. (See accompanying file |
| 6 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 7 | |
| 8 | #include <boost/proto/core.hpp> |
| 9 | #include <boost/proto/transform/make.hpp> |
| 10 | #include <boost/type_traits/add_pointer.hpp> |
| 11 | #include <boost/type_traits/remove_pointer.hpp> |
| 12 | #include <boost/test/unit_test.hpp> |
| 13 | namespace proto=boost::proto; |
| 14 | using proto::_; |
| 15 | |
| 16 | struct Test |
| 17 | : proto::when< |
| 18 | _ |
| 19 | , proto::noinvoke< |
| 20 | // This remove_pointer invocation is bloked by noinvoke |
| 21 | boost::remove_pointer< |
| 22 | // This add_pointer invocation is *not* blocked by noinvoke |
| 23 | boost::add_pointer<_> |
| 24 | > |
| 25 | >() |
| 26 | > |
| 27 | {}; |
| 28 | |
| 29 | struct Test2 |
| 30 | : proto::when< |
| 31 | _ |
| 32 | // This add_pointer gets invoked because a substitution takes place |
| 33 | // within it. |
| 34 | , boost::add_pointer< |
| 35 | proto::noinvoke< |
| 36 | // This remove_pointer invocation is bloked by noinvoke |
| 37 | boost::remove_pointer< |
| 38 | // This add_pointer invocation is *not* blocked by noinvoke |
| 39 | boost::add_pointer<_> |
| 40 | > |
| 41 | > |
| 42 | >() |
| 43 | > |
| 44 | {}; |
| 45 | |
| 46 | template<typename T, typename U> |
| 47 | struct select2nd |
| 48 | { |
| 49 | typedef U type; |
| 50 | }; |
| 51 | |
| 52 | struct Test3 |
| 53 | : proto::when< |
| 54 | _ |
| 55 | // This add_pointer gets invoked because a substitution takes place |
| 56 | // within it. |
| 57 | , select2nd< |
| 58 | void |
| 59 | , proto::noinvoke< |
| 60 | // This remove_pointer invocation is bloked by noinvoke |
| 61 | select2nd< |
| 62 | void |
| 63 | // This add_pointer invocation is *not* blocked by noinvoke |
| 64 | , boost::add_pointer<_> |
| 65 | > |
| 66 | > |
| 67 | >() |
| 68 | > |
| 69 | {}; |
| 70 | |
| 71 | |
| 72 | void test_noinvoke() |
| 73 | { |
| 74 | typedef proto::terminal<int>::type Int; |
| 75 | Int i = {.child0: 42}; |
| 76 | |
| 77 | BOOST_MPL_ASSERT(( |
| 78 | boost::is_same< |
| 79 | boost::result_of<Test(Int)>::type |
| 80 | , boost::remove_pointer<Int *> |
| 81 | > |
| 82 | )); |
| 83 | |
| 84 | boost::remove_pointer<Int *> t = Test()(i); |
| 85 | |
| 86 | BOOST_MPL_ASSERT(( |
| 87 | boost::is_same< |
| 88 | boost::result_of<Test2(Int)>::type |
| 89 | , boost::remove_pointer<Int *> * |
| 90 | > |
| 91 | )); |
| 92 | |
| 93 | boost::remove_pointer<Int *> * t2 = Test2()(i); |
| 94 | |
| 95 | BOOST_MPL_ASSERT(( |
| 96 | boost::is_same< |
| 97 | boost::result_of<Test3(Int)>::type |
| 98 | , select2nd<void, Int *> |
| 99 | > |
| 100 | )); |
| 101 | |
| 102 | select2nd<void, Int *> t3 = Test3()(i); |
| 103 | } |
| 104 | |
| 105 | using namespace boost::unit_test; |
| 106 | /////////////////////////////////////////////////////////////////////////////// |
| 107 | // init_unit_test_suite |
| 108 | // |
| 109 | test_suite* init_unit_test_suite( int argc, char* argv[] ) |
| 110 | { |
| 111 | test_suite *test = BOOST_TEST_SUITE("test proto::noinvoke" ); |
| 112 | |
| 113 | test->add(BOOST_TEST_CASE(&test_noinvoke)); |
| 114 | |
| 115 | return test; |
| 116 | } |
| 117 | |