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bugfix undef.md
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docs/undef.md

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@@ -314,6 +314,8 @@ i << 0; // 可以
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i << -1; // 错!
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```
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不过一个例外是[整数提升](https://zh.cppreference.com/w/cpp/language/implicit_conversion#.E6.95.B4.E6.95.B0.E6.8F.90.E5.8D.87)
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对于有符号整数,左移还不得破坏符号位
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```cpp

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