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

   1 //  bll_and_function.cpp  - The Boost Lambda Library -----------------------
   2 //
   3 // Copyright (C) 2000-2003 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
   4 // Copyright (C) 2000-2003 Gary Powell (powellg@amazon.com)
   5 //
   6 // Distributed under the Boost Software License, Version 1.0. (See
   7 // accompanying file LICENSE_1_0.txt or copy at
   8 // http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10 // For more information, see www.boost.org
  11
  12 // test using BLL and boost::function
  13
  14 #include <boost/core/lightweight_test.hpp>
  15 #define BOOST_CHECK BOOST_TEST
  16
  17 #include "boost/lambda/lambda.hpp"
  18
  19 #include "boost/function.hpp"
  20
  21 #include <vector>
  22 #include <map>
  23 #include <set>
  24 #include <string>
  25
  26
  27 using namespace boost::lambda;
  28
  29 using namespace std;
  30
  31 void test_function() {
  32
  33   boost::function<int (int, int)> f;
  34   f = _1 + _2;
  35
  36  BOOST_CHECK(f(1, 2)== 3);
  37
  38  int i=1; int j=2;
  39  boost::function<int& (int&, int)> g = _1 += _2;
  40  g(i, j);
  41  BOOST_CHECK(i==3);
  42
  43
  44
  45   int* sum = new int();
  46   *sum = 0;
  47   boost::function<int& (int)> counter = *sum += _1;
  48   counter(5); // ok, sum* = 5;
  49   BOOST_CHECK(*sum == 5);
  50   delete sum;
  51
  52   // The next statement would lead to a dangling reference
  53   // counter(3); // error, *sum does not exist anymore
  54
  55 }
  56
  57
  58 int main() {
  59
  60   test_function();
  61
  62   return boost::report_errors();
  63 }