Expand examples #8
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example/forest-example.cpp
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| constexpr auto foo = forest::literal<64>("<rgb=500><b><i>hello</b></i></rgb> world"); | ||
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| void with_temp_file(std::function<void(std::FILE*)> const fn) { |
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Use a template parameter typename F instead of std::function? It's quite heavy and mostly unnecessary here.
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Should I add an std::is_invocable_v check as well?
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Up to you! Since this is example "client side" code, it's not very important; different story if it were a library function.
example/forest-example.cpp
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| fn(temp_file); | ||
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| std::fclose(temp_file); |
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This is currently a bit unsafe: eg, if fn throws, the file will remain locked and undeleted. I'd suggest wrapping the "close" logic into a lambda, and temp_file into std::unique_ptr<std::FILE*, decltype(close_file)>. That way the file will always be closed on destruction of the unique ptr / the function returning (even if it unwinds due to a throw).
example/forest-example.cpp
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| int main() { | ||
| std::cout << foo << '\n'; | ||
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| std::cout << forest::literal<71>("I <strike>copy</strike> <b>study</b> code from <u>stackoverflow.com</u>") << '\n'; |
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Might want to reduce the number of magic numbers a bit; eg use forest::length() for one or two?
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How does it differ from say a call to std::string_view::size?
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forest::length will compute the size of the string after all replacements have been done. Ideally the library would call this first, figure out the required size, and then return a literal of that size, all at compile time. But getting that to work is largely impossible in C++17. Still, something like this is possible, although not great:
constexpr auto text = "<b>hi</b>";
constexpr auto output = forest::literal<forest::length(text)>(text);| forest::format_to(std::back_inserter(ft), "<b><rgb=155>Hello from the string!</rgb></b>"); | ||
| std::cout << ft << '\n'; | ||
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| with_temp_file([](std::FILE* const tf) { |
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Nice pattern! Inspired from Python?
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| constexpr auto foo = forest::literal<64>("<rgb=500><b><i>hello</b></i></rgb> world"); | ||
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| void with_temp_file(std::function<void(std::FILE*)> const fn) { | ||
| template <typename F> | ||
| void with_temp_file(F const fn) { | ||
| constexpr auto tf_name = "temp.txt"; |
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Suggestion: make this static to auto capture it.
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