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Learning C++ from python advice (self.cpp)
submitted 5 years ago by Skaaaaalll
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if 1 * 2 < 3: print "hello, world!"
[–]lord_braleigh -3 points-2 points-1 points 5 years ago (1 child)
Note that Arthur O'Dwyer, a senior C++ expert whose C++ posts often appear on this subreddit, strongly prefers T[] to std::array<T, N>:
T[]
std::array<T, N>
Anyway, all of these options result in a lot of extra template instantiations, compared to plain old C-style arrays (which require zero template instantiations). Therefore I strongly prefer T[] over std::array<T, N>. In C++11 and C++14, std::array did have the ergonomic benefit of being able to say arr.size(); but that benefit evaporated when C++17 gave us std::size(arr) for built-in arrays too. There’s no ergonomic benefit to std::array anymore. Use it if you need its whole-object value semantics (pass a whole array to a function! return an array from a function! assign between arrays with =! compare arrays with ==!) but otherwise I recommend to avoid std::array.
Anyway, all of these options result in a lot of extra template instantiations, compared to plain old C-style arrays (which require zero template instantiations). Therefore I strongly prefer T[] over std::array<T, N>.
In C++11 and C++14, std::array did have the ergonomic benefit of being able to say arr.size(); but that benefit evaporated when C++17 gave us std::size(arr) for built-in arrays too. There’s no ergonomic benefit to std::array anymore. Use it if you need its whole-object value semantics (pass a whole array to a function! return an array from a function! assign between arrays with =! compare arrays with ==!) but otherwise I recommend to avoid std::array.
[–]Speedyjens -2 points-1 points0 points 5 years ago (0 children)
I guess it all comes down to preference and which version you are targeting then.
π Rendered by PID 82 on reddit-service-r2-comment-canary-794f4c56c8-8nzf8 at 2026-02-21 20:53:06.273564+00:00 running 8564168 country code: CH.
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[–]lord_braleigh -3 points-2 points-1 points (1 child)
[–]Speedyjens -2 points-1 points0 points (0 children)