Top Questions

1. C++11 recursive function using "&&" rvalue reference leads to compilation error
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2. Does c++14 literal operator only support long double and unsigned long long type?
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3. std::any object cast to reference type, change its value, but original object is not changed
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4. std::thread constructor: passing a value by reference needs to call ref(), why?
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5. C++11: passing a temp object to a ctor, doesn't call move constructor, why?
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