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/test/minimal.hpp>    // see "Header Implementation Option"
  15
  16 #include "boost/lambda/lambda.hpp"
  17
  18 #include "boost/function.hpp"
  19
  20 #include <vector>
  21 #include <map>
  22 #include <set>
  23 #include <string>
  24
  25
  26 using namespace boost::lambda;
  27
  28 using namespace std;
  29
  30 void test_function() {
  31
  32   boost::function<int (int, int)> f;
  33   f = _1 + _2;
  34
  35  BOOST_CHECK(f(1, 2)== 3);
  36
  37  int i=1; int j=2;
  38  boost::function<int& (int&, int)> g = _1 += _2;
  39  g(i, j);
  40  BOOST_CHECK(i==3);
  41
  42
  43
  44   int* sum = new int();
  45   *sum = 0;
  46   boost::function<int& (int)> counter = *sum += _1;
  47   counter(5); // ok, sum* = 5;
  48   BOOST_CHECK(*sum == 5);
  49   delete sum;
  50
  51   // The next statement would lead to a dangling reference
  52   // counter(3); // error, *sum does not exist anymore
  53
  54 }
  55
  56
  57 int test_main(int, char *[]) {
  58
  59   test_function();
  60
  61   return 0;
  62 }
  63
  64
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  68