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Notices by Šimon Tóth (simontoth@hachyderm.io)

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 from hachyderm.io 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"; }
Šimon Tóth (simontoth@hachyderm.io)'s status on Sunday, 19-Mar-2023 19:55:03 UTC Šimon Tóth
in reply to
- Bernie
@codewiz LOL, want import std; before we have C++20 modules support?

In conversation Sunday, 19-Mar-2023 19:55:03 UTC from hachyderm.io permalink