ITERATE OVER STRING ANDROID CODEPOINTS HOW TO
minor things whether if QStringIterator is a good name, given it yields out iterators to huge design problems, like how to add customization points to decide how to handle strings containing malformed UTF-16 data (skip? replace? stop? throw an exception?). Making it so opens up many, many API problems: e.g. None of the required APIs to make this possible exist at the moment - QStringIterator is neither a range nor an iterable type. One should also be able to write something like this:Īuto stringLenInCodePoints = std::ranges::distance(QStringIterator(str)) īool stringIsUpperCase = std::ranges::all_of(QStringIterator(str), &QChar::isUpper) Īuto decodedString = QStringIterator(str) | std::ranges::to>
There are a few reasons why I am keeping QStringIterator as private API.
ITERATE OVER STRING ANDROID CODEPOINTS CODE
Regarding the QString::isUpper() function that we started this journey with: trying to fix it caused quite a discussion during code review, as you can see here and here. That’s it, no more excuses, start using QStringIterator today! QStringIterator‘s API is quite rich it supports bidirectional iteration, some customization of what should happen in case of decoding failure, as well as unchecked iteration (iteration that assumes that the QString contents are valid UTF-16 this allows skipping some checks). But this is an implementation detail calling QString algorithms on a string that contains illegal UTF-16 encoded data is unspecified behavior already, so don’t do it.) (In this case it will return U+FFFD (REPLACEMENT CHARACTER), which has the nice property of not being uppercase, therefore making the function return false. The call to next() will read as many code units are necessary to fully decode the next code point, and it will also do error checking. Returns \c true if the string only contains uppercase letters, The task of outputting Hello, world! to standard output.A few days ago Marc Mutz, colleague of mine at KDAB and also author in this blog, spotted this function from Qt’s source code ( documentation): Inside of the main function are expressions that perform Hello World § hello.zig const std = "std") pub fn main() ! void. To learn more about the Zig Standard Library, You will see many examples of Zig's Standard Library used in this documentation. Zig's Standard Library contains commonly used algorithms, data structures, and definitions to help you build programs or libraries. The Zig Standard Library has its own documentation. This HTML document depends on no external files, so you can use it offline. The code samples in this document are compiled and tested as part of the main test suite of Zig. It isĪll on one page so you can search with your browser's search tool. This documentation shows how to use each of Zig's features. Often the most efficient way to learn something new is to see examples, so Resilient to changing requirements and environments. The language imposes a low overhead to reading code and is Maintainable Precisely communicate intent to the compiler and Reusable The same code works in many environments which have differentĬonstraints. Optimal Write programs the best way they can behave and perform. Robust Behavior is correct even for edge cases such as out of memory. Zig is a general-purpose programming language and toolchain for maintaining
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