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What are you missing most from the C++ standard library?

I like C++ but I realized that I keep implementing functionality that should be part of the standard library. Here are the features I'm missing most:

- an easy way to spawn a subprocess while controlling the standard input/output. something like popen but integrated with the standard I/O streams.
- UTF-8 and Unicode: convert between UTF-8, UTF-16, and UTF-32. convert a string to lower case and to upper case.
- networking: an easy way to implement a HTTP client or server
- cross-platform memory-mapped files
- thread-safe (and possibly lock-free) queues.
- persistent data structures
- JSON serialization/deserialization

What are you missing most from the C++ standard library?

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