| // ret_test.cpp - The Boost Lambda Library ----------------------- |
| // |
| // Copyright (C) 2009 Steven Watanabe |
| // |
| // 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) |
| // |
| // For more information, see www.boost.org |
| |
| #include <boost/test/minimal.hpp> |
| |
| #include <boost/lambda/lambda.hpp> |
| |
| #include <boost/mpl/assert.hpp> |
| #include <boost/type_traits/is_same.hpp> |
| |
| template<class R, class F> |
| void test_ret(R r, F f) { |
| typename F::result_type x = f(); |
| BOOST_MPL_ASSERT((boost::is_same<R, typename F::result_type>)); |
| BOOST_CHECK(x == r); |
| } |
| |
| template<class R, class F, class T1> |
| void test_ret(R r, F f, T1& t1) { |
| typename F::result_type x = f(t1); |
| BOOST_MPL_ASSERT((boost::is_same<R, typename F::result_type>)); |
| BOOST_CHECK(x == r); |
| } |
| |
| class add_result { |
| public: |
| add_result(int i = 0) : value(i) {} |
| friend bool operator==(const add_result& lhs, const add_result& rhs) { |
| return(lhs.value == rhs.value); |
| } |
| private: |
| int value; |
| }; |
| |
| class addable {}; |
| add_result operator+(addable, addable) { |
| return add_result(7); |
| } |
| |
| int test_main(int, char*[]) { |
| addable test; |
| test_ret(add_result(7), boost::lambda::ret<add_result>(boost::lambda::_1 + test), test); |
| test_ret(8.0, boost::lambda::ret<double>(boost::lambda::constant(7) + 1)); |
| |
| return 0; |
| } |