Comments on: Rvalue-references: how they affect your code https://codesynthesis.com/~boris/blog//2008/12/01/rvalue-references-affect-your-code/ Boris Kolpackov's blog about software Tue, 14 Apr 2026 08:43:47 +0000 http://wordpress.org/?v=2.2.2 By: pizer https://codesynthesis.com/~boris/blog//2008/12/01/rvalue-references-affect-your-code/#comment-548 pizer Tue, 09 Dec 2008 16:12:16 +0000 https://codesynthesis.com/~boris/blog//2008/12/01/rvalue-references-affect-your-code/#comment-548 Nice summarization on move semantics! :) Nice summarization on move semantics! :)

]]> By: Give it a name and its gone « Blockheading about C++ https://codesynthesis.com/~boris/blog//2008/12/01/rvalue-references-affect-your-code/#comment-545 Give it a name and its gone « Blockheading about C++ Mon, 08 Dec 2008 22:14:13 +0000 https://codesynthesis.com/~boris/blog//2008/12/01/rvalue-references-affect-your-code/#comment-545 [...] http://codesynthesis.com/~boris/blog/2008/12/01/rvalue-references-affect-your-code/ [...] […] http://codesynthesis.com/~boris/blog/2008/12/01/rvalue-references-affect-your-code/ […]

]]> By: Boris Kolpackov https://codesynthesis.com/~boris/blog//2008/12/01/rvalue-references-affect-your-code/#comment-534 Boris Kolpackov Wed, 03 Dec 2008 12:34:05 +0000 https://codesynthesis.com/~boris/blog//2008/12/01/rvalue-references-affect-your-code/#comment-534 Hermann, I think people will learn rvalue-references because they allow writing more efficient and more natural code. As I explained above, none of the approaches used currently are as efficient as return by value of an rvalue-optimized type. As for letting the compiler do things automatically, I agree it would have been better. However, C++ has a very transparent and unrestrictive object model and doing something "smart" under the hood usually becomes observable in one way or the other. The C++ compiler will do things automatically when rvalues are involved. std::move is just an extra tool that allows you to eliminate copying when lvalues are involved. Boris Hermann,

I think people will learn rvalue-references because they allow writing more efficient and more natural code. As I explained above, none of the approaches used currently are as efficient as return by value of an rvalue-optimized type.

As for letting the compiler do things automatically, I agree it would have been better. However, C++ has a very transparent and unrestrictive object model and doing something “smart” under the hood usually becomes observable in one way or the other. The C++ compiler will do things automatically when rvalues are involved. std::move is just an extra tool that allows you to eliminate copying when lvalues are involved.

Boris

]]> By: Hermann https://codesynthesis.com/~boris/blog//2008/12/01/rvalue-references-affect-your-code/#comment-532 Hermann Wed, 03 Dec 2008 00:51:24 +0000 https://codesynthesis.com/~boris/blog//2008/12/01/rvalue-references-affect-your-code/#comment-532 Honestly I am still believing that is definitely better to let the compiler know about such optimization than forcing the user to learn a new function to provide some additional efficiency. Letting the user know about the std::move function will not help C++ become easier. In fact, I think that the difficulty of the usage of this new "keyword" will not stimulate its adoption: why should everyone learn a new trick if the result and compilation is the same of using the previous approaches? By the way, nice explanation about this new feature. Really! :) Regards. Honestly I am still believing that is definitely better to let the compiler know about such optimization than forcing the user to learn a new function to provide some additional efficiency.

Letting the user know about the std::move function will not help C++ become easier. In fact, I think that the difficulty of the usage of this new “keyword” will not stimulate its adoption: why should everyone learn a new trick if the result and compilation is the same of using the previous approaches?

By the way, nice explanation about this new feature. Really! :)

Regards.

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