ceph/src/boost/libs/local_function/test/return_this.cpp

   1
   2 // Copyright (C) 2009-2012 Lorenzo Caminiti
   3 // Distributed under the Boost Software License, Version 1.0
   4 // (see accompanying file LICENSE_1_0.txt or a copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6 // Home at http://www.boost.org/libs/local_function
   7
   8 #include <boost/config.hpp>
   9 #ifdef BOOST_NO_CXX11_VARIADIC_MACROS
  10 #   error "variadic macros required"
  11 #else
  12
  13 #include <boost/local_function.hpp>
  14 #include <boost/function.hpp>
  15 #include <boost/typeof/typeof.hpp>
  16 #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
  17 #include <boost/detail/lightweight_test.hpp>
  18
  19 struct number;
  20 BOOST_TYPEOF_REGISTER_TYPE(number) // Register before `bind this_` below.
  21
  22 struct number {
  23     number(int value) : value_(value) {}
  24
  25     boost::function<int (void)> inc(void) {
  26         int BOOST_LOCAL_FUNCTION(bind this_) {
  27             return ++this_->value_;
  28         } BOOST_LOCAL_FUNCTION_NAME(i)
  29         return i;
  30     }
  31
  32 private:
  33     int value_;
  34 };
  35
  36 int main(void) {
  37     number n1 = 0; // Object valid in scope where closure is used.
  38     boost::function<int (void)> inc1 = n1.inc();
  39     number n2 = 0;
  40     boost::function<int (void)> inc2 = n2.inc();
  41
  42     BOOST_TEST(inc1() == 1);
  43     BOOST_TEST(inc1() == 2);
  44     BOOST_TEST(inc2() == 1);
  45     BOOST_TEST(inc1() == 3);
  46     return boost::report_errors();
  47 }
  48
  49 #endif // VARIADIC_MACROS
  50