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Post AvRxSv8AcOqSMae036 by [email protected] |
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More posts by [email protected] |
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Post #AvRx4QuBLRgdfcQOUi by [email protected] |
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I find myself with the need for a std::vector-alike that embeds the capacity at… |
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Post #AvRx4R1ysRvQ3o4ceO by [email protected] |
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@TartanLlama No, because there's no way to find that address for the capaci… |
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Post #AvRxSv1n07k02neu6S by [email protected] |
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@dascandy you store the size as a member, just not the capacity. The capacity m… |
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Post #AvRxSv8AcOqSMae036 by [email protected] |
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@TartanLlama how is that advantageous over moving both size/capacity into the a… |
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Post #AvRy2KJ30amCZxcBFI by [email protected] |
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@dascandy I'm targeting an ABI where vector is (ptr,size) and want to lower… |
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Post #AvRy2KP4eBb4seQzdg by [email protected] |
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@TartanLlama Haven't seen it yet but seems useful for that interop. Is it w… |
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Post #AvRyKPifcYLoa3DyJk by [email protected] |
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@dascandy a bit of both: it's for generating C++ bindings from Wasm's c… |
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Post #AvRyKPohG9Agsk2mi8 by [email protected] |
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@TartanLlama Did you check with the people working on Rust-C++ interop already?… |
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Post #AvacAxsPK04B3HVW8O by [email protected] |
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Context: the Wasm component ABI passes vectors as (ptr,size). Since C++ vectors… |
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Post #AvacAxyQxat3LyKKWm by [email protected] |
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I have an implementation that maybe works? https://godbolt.org/z/PnPM39c7q |
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Post #AvacAy6aTHPPlG8qEi by [email protected] |
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@TartanLlama If I understand your requirements correctly you could also still k… |
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Post #AvacAyCG8Bwi2qnN4q by [email protected] |
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@dotstdy Unfortunately I need to be able to hand off the buffer to code that is… |
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Post #AvacAzCIPXZN9Foum0 by [email protected] |
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I forget where the standard ended up with requiring std::launder here |
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Post #AvacBiM6Vv9ZChksoC by [email protected] |
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@TartanLlama ah right of course, it's even written down in there :') |
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Post #AvacCKMnBoHb5qMy9o by [email protected] |
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@TartanLlama You need to be careful with the provenance of pointers (here: refe… |
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Post #AvacCR7S5FAg2IFJia by [email protected] |
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@TartanLlama how would it know the offset to the end of the allocated data unle… |
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Post #AvacCRDTipzYKz486y by [email protected] |
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@cliffordheath you store it just after the last element and move it around as y… |
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Post #AvacCRKZITfAgyNnA8 by [email protected] |
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@TartanLlama @cliffordheath that's an extra cost per push. Could you do som… |
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Post #AvacCRQExOCSyZ2K0G by [email protected] |
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@JSAMcFarlane That was my initial approach, however I need to support releasing… |
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Post #AvacD8A63HpvWwoXJI by [email protected] |
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@TartanLlama Are std::span not already simply (ptr, size) ? You could then pass… |
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Post #AvacD8GpeFDxrpxuoC by [email protected] |
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@thibault then you need storage to back the nested spans though |
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Post #AvacD8NZFCc0Cj7IJ6 by [email protected] |
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@TartanLlama Yeah, but if you already have the vectors/arrays allocated somewhe… |
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Post #AvacD8TwrTiSWW6OFk by [email protected] |
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@thibault at the ABI interface, the top-level vector needs to become a single (… |
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Post #AvacDJCd0DOhlz5DHc by [email protected] |
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@TartanLlama Ah, bummer. |
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Post #AvacDspqWOZ4HkhWls by [email protected] |
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@TartanLlama (noob here) what is the exact difference between "size" … |
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Post #AvacDswa7Lx6cdquGm by [email protected] |
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@pierstoval `size` is the number of elements currently stored, `capacity` is th… |
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Post #AvacEH3qS01TQ7R2vI by [email protected] |
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@TartanLlama Oh I see, thanks! |
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Post #AvacFBBvl7lTVPeIIi by [email protected] |
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@TartanLlama that sounds neither difficult nor advantageous |
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Post #AvacFBHbQ2Iln0Ip8q by [email protected] |
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@cliffordheath I'm targeting an ABI where vector is (ptr,size) and want to … |
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Post #AvacFMwQ4cUHwmU4n2 by [email protected] |
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@TartanLlama yes, I see. I implemented immutable (cow) slices, so perhaps some … |
