In this article, I will introduce two new warnings I've implemented for GCC 9 that deal with incorrect usage of std::move. Fortunately, the compiler can sometimes help with finding such wrong uses of std::move. However, std::move must be used judiciously using it blithely may lead to performance degradation, or simply be redundant, affecting readability of the code. This version of swap consists of one move construction and two move assignments and does not involve any deep copies. All is well. For example, we can write a more effective version of swap using std::move: std::move merely casts its argument to an rvalue reference to allow moving it, but doesn't guarantee a move operation. The standard C++ library gained a function template called std::move, which, despite its name, does not move anything. Move semantics came along with several more or less related features, such as rvalue references, xvalues, forwarding references, perfect forwarding, and so on. Essentially, you can think of it as turning a deep copy into a shallow copy. Move semantics is a way to avoid expensive deep copy operations and replace them with cheaper move operations. One of the most important concepts introduced in C++11 was move semantics.
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