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