123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264 |
- // Copyright Cromwell D. Enage 2018.
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- #include <boost/parameter/config.hpp>
- #if !defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) && \
- (BOOST_PARAMETER_COMPOSE_MAX_ARITY < 3)
- #error Define BOOST_PARAMETER_COMPOSE_MAX_ARITY as 3 or greater.
- #endif
- #include <boost/parameter/name.hpp>
- namespace test {
- BOOST_PARAMETER_NAME(a0)
- BOOST_PARAMETER_NAME(a1)
- BOOST_PARAMETER_NAME(a2)
- }
- #if !defined(BOOST_NO_SFINAE)
- #include <boost/parameter/is_argument_pack.hpp>
- #include <boost/type_traits/is_convertible.hpp>
- #include <boost/core/enable_if.hpp>
- #endif
- namespace test {
- #if !defined(BOOST_NO_SFINAE)
- struct _enabler
- {
- };
- #endif
- template <typename T>
- class backend0
- {
- T _a0;
- public:
- template <typename ArgPack>
- explicit backend0(
- ArgPack const& args
- #if !defined(BOOST_NO_SFINAE)
- , typename boost::enable_if<
- boost::parameter::is_argument_pack<ArgPack>
- , test::_enabler
- >::type = test::_enabler()
- #endif
- ) : _a0(args[test::_a0])
- {
- }
- #if !defined(BOOST_NO_SFINAE)
- template <typename U>
- backend0(
- backend0<U> const& copy
- , typename boost::enable_if<
- boost::is_convertible<U,T>
- , test::_enabler
- >::type = test::_enabler()
- ) : _a0(copy.get_a0())
- {
- }
- #endif
- template <typename Iterator>
- backend0(Iterator itr, Iterator itr_end) : _a0(itr, itr_end)
- {
- }
- T const& get_a0() const
- {
- return this->_a0;
- }
- protected:
- template <typename ArgPack>
- void initialize_impl(ArgPack const& args)
- {
- this->_a0 = args[test::_a0];
- }
- };
- template <typename B, typename T>
- class backend1 : public B
- {
- T _a1;
- public:
- template <typename ArgPack>
- explicit backend1(
- ArgPack const& args
- #if !defined(BOOST_NO_SFINAE)
- , typename boost::enable_if<
- boost::parameter::is_argument_pack<ArgPack>
- , test::_enabler
- >::type = test::_enabler()
- #endif
- ) : B(args), _a1(args[test::_a1])
- {
- }
- #if !defined(BOOST_NO_SFINAE)
- template <typename Derived>
- backend1(
- Derived const& copy
- , typename boost::disable_if<
- boost::parameter::is_argument_pack<Derived>
- , test::_enabler
- >::type = test::_enabler()
- ) : B(copy), _a1(copy.get_a1())
- {
- }
- #endif
- T const& get_a1() const
- {
- return this->_a1;
- }
- protected:
- template <typename ArgPack>
- void initialize_impl(ArgPack const& args)
- {
- B::initialize_impl(args);
- this->_a1 = args[test::_a1];
- }
- };
- template <typename B, typename T>
- class backend2 : public B
- {
- T _a2;
- public:
- template <typename ArgPack>
- explicit backend2(
- ArgPack const& args
- #if !defined(BOOST_NO_SFINAE)
- , typename boost::enable_if<
- boost::parameter::is_argument_pack<ArgPack>
- , test::_enabler
- >::type = test::_enabler()
- #endif
- ) : B(args), _a2(args[test::_a2])
- {
- }
- #if !defined(BOOST_NO_SFINAE)
- template <typename Derived>
- backend2(
- Derived const& copy
- , typename boost::disable_if<
- boost::parameter::is_argument_pack<Derived>
- , test::_enabler
- >::type = test::_enabler()
- ) : B(copy), _a2(copy.get_a2())
- {
- }
- #endif
- T const& get_a2() const
- {
- return this->_a2;
- }
- protected:
- template <typename ArgPack>
- void initialize_impl(ArgPack const& args)
- {
- B::initialize_impl(args);
- this->_a2 = args[test::_a2];
- }
- };
- }
- #include <boost/parameter/preprocessor_no_spec.hpp>
- #if !defined(BOOST_NO_SFINAE)
- #include <boost/parameter/are_tagged_arguments.hpp>
- #endif
- namespace test {
- template <typename B>
- struct frontend : public B
- {
- BOOST_PARAMETER_NO_SPEC_CONSTRUCTOR(frontend, (B))
- #if !defined(BOOST_NO_SFINAE)
- template <typename Iterator>
- frontend(
- Iterator itr
- , Iterator itr_end
- , typename boost::disable_if<
- boost::parameter::are_tagged_arguments<Iterator>
- , test::_enabler
- >::type = test::_enabler()
- ) : B(itr, itr_end)
- {
- }
- template <typename O>
- frontend(frontend<O> const& copy) : B(copy)
- {
- }
- #endif
- BOOST_PARAMETER_NO_SPEC_MEMBER_FUNCTION((void), initialize)
- {
- this->initialize_impl(args);
- }
- BOOST_PARAMETER_NO_SPEC_FUNCTION_CALL_OPERATOR((void))
- {
- this->initialize_impl(args);
- }
- };
- } // namespace test
- #include <boost/core/lightweight_test.hpp>
- #if !defined(BOOST_NO_SFINAE)
- #include <string>
- #endif
- int main()
- {
- char const* p = "foo";
- char const* q = "bar";
- test::frontend<
- test::backend2<test::backend1<test::backend0<char const*>, char>, int>
- > composed_obj0(test::_a2 = 4, test::_a1 = ' ', test::_a0 = p);
- #if defined(BOOST_NO_SFINAE)
- test::frontend<
- test::backend1<test::backend2<test::backend0<char const*>, int>, char>
- > composed_obj1(test::_a0 = p, test::_a1 = ' ', test::_a2 = 4);
- #else
- test::frontend<
- test::backend1<test::backend2<test::backend0<char const*>, int>, char>
- > composed_obj1(composed_obj0);
- #endif
- BOOST_TEST_EQ(composed_obj0.get_a0(), composed_obj1.get_a0());
- BOOST_TEST_EQ(composed_obj0.get_a1(), composed_obj1.get_a1());
- BOOST_TEST_EQ(composed_obj0.get_a2(), composed_obj1.get_a2());
- composed_obj0.initialize(test::_a0 = q, test::_a1 = '!', test::_a2 = 8);
- composed_obj1.initialize(test::_a2 = 8, test::_a1 = '!', test::_a0 = q);
- BOOST_TEST_EQ(composed_obj0.get_a0(), composed_obj1.get_a0());
- BOOST_TEST_EQ(composed_obj0.get_a1(), composed_obj1.get_a1());
- BOOST_TEST_EQ(composed_obj0.get_a2(), composed_obj1.get_a2());
- composed_obj0(test::_a2 = 8, test::_a1 = '!', test::_a0 = q);
- composed_obj1(test::_a0 = q, test::_a1 = '!', test::_a2 = 8);
- BOOST_TEST_EQ(composed_obj0.get_a0(), composed_obj1.get_a0());
- BOOST_TEST_EQ(composed_obj0.get_a1(), composed_obj1.get_a1());
- BOOST_TEST_EQ(composed_obj0.get_a2(), composed_obj1.get_a2());
- #if !defined(BOOST_NO_SFINAE)
- test::frontend<test::backend0<std::string> > string_wrap(p, p + 3);
- BOOST_TEST_EQ(string_wrap.get_a0(), std::string(p));
- #endif
- return boost::report_errors();
- }
|