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Bernie (codewiz@mstdn.io)'s status on Friday, 23-Jun-2023 20:47:18 UTC Bernie
in reply to
- Šimon Tóth
@simontoth O have recently enabled C++20 on an embedded code add, but haven't tried ranges and views yet.
How well do they perform on short sequences? Would code size increase compared to hand-coded loops?
And... do they work with fixed-size containers without heap allocations?

In conversation Friday, 23-Jun-2023 20:47:18 UTC from mstdn.io permalink
- Šimon Tóth (simontoth@hachyderm.io)'s status on Friday, 23-Jun-2023 20:47:19 UTC Šimon Tóth
  
  When working with C++20 views, creating functions that encapsulate complex view compositions might be tempting.
  However, that will very likely lead to unnecessary data copies. Instead, consider compositing views as inline constexpr variables.
  Compiler Explorer link: https://compiler-explorer.com/z/vG4hhe77h
  #cpp #cplusplus #coding #programming #dailybiteofcpp
  In conversation Friday, 23-Jun-2023 20:47:19 UTC permalink
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  2. Compiler Explorer - C++
    
    from Matt Godbolt
    
    constexpr inline auto trim_front = std::views::drop_while([](int c) { return std::isspace(c); }); constexpr inline auto trim_back = std::views::reverse | trim_front | std::views::reverse; constexpr inline auto trim_space = trim_back | trim_front; int main() { std::string str = " abc \t"; // Compose the view with data auto lazy_trimmed = str | trim_space; // Generate the output (before C++23 std::ranges::to) std::string out(lazy_trimmed.begin(), lazy_trimmed.end()); // out == "abc" std::cout << "out == " << std::quoted(out) << "\n"; }

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