回答編集履歴
1
yohhoyさんのアドバイスより、appleをatomicへ変更
answer
CHANGED
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@@ -7,6 +7,7 @@
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```C++
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#include <thread>
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#include <mutex>
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+
#include <atomic>
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#include <chrono>
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#include <algorithm>
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#include <iostream>
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@@ -22,7 +23,7 @@
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int b=0;
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{
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-
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std::atomic_int apple=100;
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std::mutex mutex;
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@@ -36,7 +37,7 @@
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{
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std::lock_guard<std::mutex> lock(mutex);
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sleep(1); // りんご購入
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-
int buy=std::min(5, apple);
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int buy=std::min(5, static_cast<int>(apple));
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apple -= buy;
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a += buy;
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}
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@@ -56,7 +57,7 @@
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{
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std::lock_guard<std::mutex> lock(mutex);
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sleep(2); // りんご購入
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-
int buy=std::min(3, apple);
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int buy=std::min(3, static_cast<int>(apple));
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apple -= buy;
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b += buy;
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}
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@@ -72,4 +73,4 @@
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std::cout << "b=" << b << "\n";
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}
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```
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-
[wandbox](https://wandbox.org/permlink/
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+
[wandbox](https://wandbox.org/permlink/DUUQxDhIJR7OoYvo)
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