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fix: typo (changkun#49)
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book/zh-cn/03-runtime.md

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@@ -236,7 +236,7 @@ void reference(std::string&& str) {
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int main()
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{
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std::string lv1 = "string,"; // lv1 是一个左值
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// std::string&& r1 = s1; // 非法, 右值引用不能引用左值
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// std::string&& r1 = lv1; // 非法, 右值引用不能引用左值
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std::string&& rv1 = std::move(lv1); // 合法, std::move可以将左值转移为右值
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std::cout << rv1 << std::endl; // string,
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