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追記
test
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@@ -15,3 +15,23 @@
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cout << labs(static_cast<long>(a - b)) << endl;
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```
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追記
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---
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規格書を見る限り、実装依存であるようです。
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> **Integral conversions**
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...
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If the destination type is signed, the value is unchanged if it can be represented in the destination type;
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otherwise, the value is implementation-defined.
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引用元: N4659 [conv.integral]
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