/** 増補改訂版　Java 言語で学ぶデザインパターン入門　【マルチスレッド編】p58 SingleThreadExecution.cpp **/

#include <thread>

#include <mutex>

#include <iostream>

class Gate

{

public:

void pass(std::string name, std::string address)

{

//この排他制御を入れるか入れないかで結果が変わる。

std::lock_guard<std::mutex> lock(m_gate);

m_counter++;

m_name = name;

m_address = address;

check();

}

std::string toString()

{

return "No." + std::to_string(m_counter) + " : " + m_name + ", " + m_address;

}

private:

int m_counter = 0;

std::string m_name = "Nobody";

std::string m_address = "Nowhere";

std::mutex m_gate;

void check()

{

if(m_name.at(0) != m_address.at(0))

{

std::cout << " ******** BROKEN ******** " << toString() <<std::endl;

}

}

};

int main()

{

auto PasstheGate = [](Gate & gate, const std::string& name, const std::string& address)

{

std::cout << name << " BEGIN." << std::endl;

while(true){

gate.pass(name, address);

}

};

Gate gate;

std::string Alice_name = "Alice";

std::string Alice_address = "Alaska";

std::thread AliceThread(PasstheGate, std::ref(gate), std::ref(Alice_name), std::ref(Alice_address));

std::string Bobby_name = "Bobby";

std::string Bobby_address = "Brazil";

std::thread BobbyThread(PasstheGate, std::ref(gate), std::ref(Bobby_name), std::ref(Bobby_address));

std::string Chris_name = "Chris";

std::string Chris_address = "Canada";

std::thread ChrisThread(PasstheGate, std::ref(gate), std::ref(Chris_name), std::ref(Chris_address));

AliceThread.join();

BobbyThread.join();

ChrisThread.join();

return 0;

}