ceph/src/boost/libs/lambda/test/ret_test.cpp

   1 //  ret_test.cpp  - The Boost Lambda Library -----------------------
   2 //
   3 // Copyright (C) 2009 Steven Watanabe
   4 //
   5 // Distributed under the Boost Software License, Version 1.0. (See
   6 // accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9 // For more information, see www.boost.org
  10
  11 #include <boost/test/minimal.hpp>
  12
  13 #include <boost/lambda/lambda.hpp>
  14
  15 #include <boost/mpl/assert.hpp>
  16 #include <boost/type_traits/is_same.hpp>
  17
  18 template<class R, class F>
  19 void test_ret(R r, F f) {
  20     typename F::result_type x = f();
  21     BOOST_MPL_ASSERT((boost::is_same<R, typename F::result_type>));
  22     BOOST_CHECK(x == r);
  23 }
  24
  25 template<class R, class F, class T1>
  26 void test_ret(R r, F f, T1& t1) {
  27     typename F::result_type x = f(t1);
  28     BOOST_MPL_ASSERT((boost::is_same<R, typename F::result_type>));
  29     BOOST_CHECK(x == r);
  30 }
  31
  32 class add_result {
  33 public:
  34     add_result(int i = 0) : value(i) {}
  35     friend bool operator==(const add_result& lhs, const add_result& rhs) {
  36         return(lhs.value == rhs.value);
  37     }
  38 private:
  39     int value;
  40 };
  41
  42 class addable {};
  43 add_result operator+(addable, addable) {
  44     return add_result(7);
  45 }
  46
  47 int test_main(int, char*[]) {
  48     addable test;
  49     test_ret(add_result(7), boost::lambda::ret<add_result>(boost::lambda::_1 + test), test);
  50     test_ret(8.0, boost::lambda::ret<double>(boost::lambda::constant(7) + 1));
  51
  52     return 0;
  53 }