ceph/src/boost/libs/asio/example/cpp11/executors/bank_account_1.cpp

   1 #include <boost/asio/execution.hpp>
   2 #include <boost/asio/static_thread_pool.hpp>
   3 #include <iostream>
   4
   5 using boost::asio::static_thread_pool;
   6 namespace execution = boost::asio::execution;
   7
   8 // Traditional active object pattern.
   9 // Member functions do not block.
  10
  11 class bank_account
  12 {
  13   int balance_ = 0;
  14   mutable static_thread_pool pool_{1};
  15
  16 public:
  17   void deposit(int amount)
  18   {
  19     execution::execute(
  20         pool_.executor(),
  21         [this, amount]
  22         {
  23           balance_ += amount;
  24         });
  25   }
  26
  27   void withdraw(int amount)
  28   {
  29     execution::execute(
  30         pool_.executor(),
  31         [this, amount]
  32         {
  33           if (balance_ >= amount)
  34             balance_ -= amount;
  35         });
  36   }
  37
  38   void print_balance() const
  39   {
  40     execution::execute(
  41         pool_.executor(),
  42         [this]
  43         {
  44           std::cout << "balance = " << balance_ << "\n";
  45         });
  46   }
  47
  48   ~bank_account()
  49   {
  50     pool_.wait();
  51   }
  52 };
  53
  54 int main()
  55 {
  56   bank_account acct;
  57   acct.deposit(20);
  58   acct.withdraw(10);
  59   acct.print_balance();
  60 }