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#include <boost/asio/post.hpp>
#include <boost/asio/thread_pool.hpp>
#include <boost/asio/use_future.hpp>
#include <iostream>
using boost::asio::post;
using boost::asio::thread_pool;
using boost::asio::use_future;
// Traditional active object pattern.
// Member functions block until operation is finished.
class bank_account
{
int balance_ = 0;
mutable thread_pool pool_{1};
public:
void deposit(int amount)
{
post(pool_,
use_future([=]
{
balance_ += amount;
})).get();
}
void withdraw(int amount)
{
post(pool_,
use_future([=]
{
if (balance_ >= amount)
balance_ -= amount;
})).get();
}
int balance() const
{
return post(pool_,
use_future([=]
{
return balance_;
})).get();
}
};
int main()
{
bank_account acct;
acct.deposit(20);
acct.withdraw(10);
std::cout << "balance = " << acct.balance() << "\n";
}
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