Question 1

utf8.h vs ICU for C++ Unicode handling

Accepted Answer

utf8.h is a lightweight, single-header library focused on basic UTF-8 string operations with a familiar API, while ICU is a comprehensive solution offering full Unicode support like normalization and collation, but with more complexity and dependencies.

Question 2

How to validate and repair UTF-8 strings with utf8.h

Accepted Answer

Use utf8valid to detect invalid sequences and utf8makevalid to replace them with a specified codepoint, ensuring string correctness. This is useful for cleaning external input, as described in the function documentation.

Question 3

What are the limitations of utf8.h case-insensitive comparisons?

Accepted Answer

utf8casecmp only handles specific Unicode blocks like Latin, Greek, and Cyrillic, so comparisons for languages outside these blocks, such as East Asian scripts, will not be case-insensitive, limiting its use in global applications.

Question 4

Is utf8.h compatible with C++20 char8_t?

Accepted Answer

Yes, utf8.h uses char8_t* in C++20 for better type safety, as noted in the Design section. This requires adjustments if upgrading from older C++ standards or mixing with char-based strings.

Question 5

How does utf8.h performance compare to standard C strings?

Accepted Answer

utf8.h adds minimal overhead by operating directly on UTF-8 bytes, but functions like utf8len scan for multibyte characters, making it slightly slower than strlen for ASCII-only strings. It's optimized for simplicity over peak performance.

Question 6

Can utf8.h handle invalid UTF-8 sequences in real-time?

Accepted Answer

Yes, with utf8makevalid, you can dynamically repair invalid sequences by replacing them with a safe codepoint, though this might alter the original text. It's a practical solution for robustness in data processing.

utf8.h

What is utf8.h?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions