Timeline for How do I declare a 2d array in C++ using new?
Current License: CC BY-SA 4.0
23 events
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| May 30, 2023 at 15:31 | history | edited | Levi Morrison | CC BY-SA 4.0 |
Updated for C++23
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| Sep 29, 2018 at 14:49 | history | edited | Levi Morrison | CC BY-SA 4.0 |
Add missing comma.
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| Sep 29, 2018 at 6:12 | comment | added | Arash |
typo: using grid = std::array<std::array<int, sizeX> sizeY>; is missing a comma before sizeY.
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| Aug 1, 2018 at 12:26 | comment | added | Levi Morrison |
Also, @KcFnMi, if you decide to use kamshi's answer then be sure to read Ben's comment about using make_unique instead of new/delete.
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| Aug 1, 2018 at 12:23 | comment | added | Levi Morrison |
They are fairly comparable with respect to the underlying technique: there is a single array that holds all values in all dimensions. Then, somehow return pointers to the beginning of each row. In practice the class will usually have more useful methods, possibly have copy constructor and copy assignment operators, have asserts for debug builds to verify memory accesses, etc. These additions generally make it easier and nicer to work with.
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| Aug 1, 2018 at 2:23 | comment | added | KcFnMi | May I say this is a sophisticated/modern answer with underneath philosophy very similar to (simpler, in terms of LOC and concepts) answer given by @kamshi? | |
| May 15, 2018 at 15:26 | history | edited | Levi Morrison | CC BY-SA 4.0 |
Tweak clang-format
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| May 15, 2018 at 14:59 | history | edited | Levi Morrison | CC BY-SA 4.0 |
Format using clang-format
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| Oct 23, 2017 at 16:29 | history | edited | Levi Morrison | CC BY-SA 3.0 |
Add `operator()`
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| Oct 14, 2017 at 16:04 | history | edited | Levi Morrison | CC BY-SA 3.0 |
Fix rows and columns.
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| Sep 14, 2017 at 14:47 | history | edited | Levi Morrison | CC BY-SA 3.0 |
note that `make_unique` is part of C++14
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| Jun 13, 2017 at 13:19 | comment | added | Levi Morrison |
If you know the dimensions at compile time (which you do if you are using template parameters) then I recommend using a std::array of std::arrays: std::array<std::array<int, columns> rows>.
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| Jun 12, 2017 at 15:15 | comment | added | Janus Troelsen | would it be possible to make the rows and columns template parameters? | |
| Apr 25, 2017 at 14:42 | history | edited | Levi Morrison | CC BY-SA 3.0 |
Describe image.
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| Nov 21, 2016 at 16:37 | history | edited | Levi Morrison | CC BY-SA 3.0 |
Change formatting so it fits without scrolling on smaller screens or larger fonts.
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| Jun 10, 2016 at 13:28 | history | edited | Levi Morrison | CC BY-SA 3.0 |
Inline constructor as VS has issues with it.
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| Feb 1, 2016 at 17:33 | history | edited | Levi Morrison | CC BY-SA 3.0 |
Use C++11 brace initialization
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| Oct 17, 2015 at 15:47 | history | edited | Levi Morrison | CC BY-SA 3.0 |
Remove const
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| Sep 30, 2015 at 0:04 | history | edited | Levi Morrison | CC BY-SA 3.0 |
Explain simplified class a bit more (was sort of removed by previous edit)
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| Sep 16, 2015 at 14:22 | history | edited | Levi Morrison | CC BY-SA 3.0 |
Return by const reference (helpful in some situations)
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| Sep 12, 2015 at 13:54 | history | edited | Levi Morrison | CC BY-SA 3.0 |
Clarify some assumptions.; added 3 characters in body
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| Aug 28, 2015 at 20:58 | history | edited | Levi Morrison | CC BY-SA 3.0 |
Expanded explanations.
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| Aug 28, 2015 at 20:44 | history | answered | Levi Morrison | CC BY-SA 3.0 |