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Why is `std::move` named `std::move`?

Barbara Streisand

Nov 25, 2024 pm 02:50 PM

Why is `std::move` named `std::move`?

Why is std::move named std::move?

While the std::move(x) function doesn't physically move anything, it acts as a cast to an rvalue. This naming decision was made to enhance code readability.

In earlier discussions of rvalue references, the syntax sugar "move" was introduced to convey the intent behind the casting, specifically to enable move semantics. This naming replaced the more technical "cast_to_rvalue," which might raise questions about its purpose.

By using "move," the code explicitly indicates an intention to move from the right-hand side rather than copy from it, without needing to understand the specific implementation details.

The underlying mechanism of std::move is a cast to an xvalue, but its main impact is during compilation, where it may influence the selection of the appropriate overload based on the presence of move assignment operators. At runtime, std::move disappears completely, having no noticeable impact on object code for trivially movable objects.

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