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- /*=============================================================================
- Copyright (c) 2001-2007 Joel de Guzman
- Copyright (c) 2015 John Fletcher
- 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 <iostream>
- #include <cmath>
- #include <boost/detail/lightweight_test.hpp>
- #include <boost/phoenix/core.hpp>
- #include <boost/phoenix/operator.hpp>
- #include <boost/phoenix/bind.hpp>
- namespace phoenix = boost::phoenix;
- using std::cout;
- using std::pow;
- struct test
- {
- typedef void result_type;
- void
- operator()() const
- {
- cout << "Test lazy functions...\n";
- }
- };
- struct sqr
- {
- template <typename Sig>
- struct result;
- template <typename This, typename Arg>
- struct result<This(Arg&)>
- {
- typedef Arg type;
- };
- template <typename Arg>
- Arg
- operator()(Arg n) const
- {
- return n * n;
- }
- };
- struct fact
- {
- template <typename Sig>
- struct result;
- template <typename This, typename Arg>
- struct result<This(Arg&)>
- {
- typedef Arg type;
- };
- template <typename Arg>
- Arg
- operator()(Arg n) const
- {
- return (n <= 0) ? 1 : n * (*this)(n-1);
- }
- };
- struct power
- {
- template<typename Sig>
- struct result;
- template<typename This, typename Arg1, typename Arg2>
- struct result<This(Arg1&, Arg2&)>
- {
- typedef Arg1 type;
- };
- template <typename Arg1, typename Arg2>
- Arg1
- operator()(Arg1 a, Arg2 b) const
- {
- return pow(a, b);
- }
- };
- struct add
- {
- template <typename Sig>
- struct result;
- template <typename This, typename Arg1, typename Arg2, typename Arg3, typename Arg4>
- struct result<This(Arg1&, Arg2&, Arg3&, Arg4&)>
- {
- typedef Arg1 type;
- };
- template <typename Arg1, typename Arg2, typename Arg3, typename Arg4>
- Arg1
- operator()(Arg1 a, Arg2 b, Arg3 c, Arg4 d) const
- {
- return a + b + c + d;
- }
- };
- int
- main()
- {
- using phoenix::bind;
- using phoenix::ref;
- using phoenix::arg_names::_1;
- using phoenix::arg_names::arg1;
- using phoenix::arg_names::arg2;
- int i5 = 5;
- double d5 = 5, d3 = 3;
- test()();
- BOOST_TEST(bind(sqr(), arg1)(i5) == (i5*i5));
- BOOST_TEST(bind(fact(), 4)() == 24);
- BOOST_TEST(bind(fact(), arg1)(i5) == 120);
- BOOST_TEST((int)bind(power(), arg1, arg2)(d5, d3) == (int)std::pow(d5, d3));
- BOOST_TEST((bind(sqr(), arg1) + 5)(i5) == ((i5*i5)+5));
- BOOST_TEST(bind(add(), arg1, arg1, arg1, arg1)(i5) == (5+5+5+5));
- int const ic5 = 5;
- // testing consts
- BOOST_TEST(bind(sqr(), arg1)(ic5) == (ic5*ic5));
-
- // From Steven Watanabe
- sqr s;
- int x = 2;
- int result = bind(ref(s), _1)(x);
- BOOST_TEST(result == 4);
- return boost::report_errors();
- }
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