vicente.botet wrote:
Hi,
I'm looking for a use case where the use of swap_in_place (or whatever is renamed) is not followed/preceded by a copy.
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Can somene help me to identify a real use case on which the swap_in_place can be used to reveive a message, without needing to do any additional copy from the swapped buffer to native data?
Thanks, _____________________ Vicente Juan Botet Escribá http://viboes.blogspot.com/
Hello Vicente - I hope you are doing well. It was a pleasure to meet you at boostcon. I think one problem might be the focus on "messaging" as the reason for endian swapping. Granted, that is a large use case and one that I suspect most of us use. I also do a fair amount of swapping of bytes/bits in signal processing work. Typically I have received some signal via a DMA transfer and now need to operate on it. As much as possible this is done in-place. Typical operations include changing the endian to match the processor. For example, many PCM codecs will result in a little endian audio signal; however, most of my favorite processors are big endian. The swap will be in-place. Another typical operation is time decimation for a Fourier transform which is basically bit-reversal of the indexes. This is also in-place. Even my messaging for these small embedded processors is in-place. I just don't have the memory nor cycles to make copies. A message is formed in memory. It is "transformed" to the right endian and then the buffer is sent to a DMA engine. I could provide dozens of use-cases of in-place endian transforms. Just start thinking little to no memory and not a lot of processor cycles and you can come up with a bunch. Hope this helps a little. The endian library is of great interest to me. I'm reading all of the email traffic but don't have the time right yet to jump into the discussion. michael -- ---------------------------------- Michael Caisse Object Modeling Designs www.objectmodelingdesigns.com