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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
std::string is simply a string of bytes, so can already contain utf-8 encoded text. The only problem is when you want to interact with OS (Windows) API and other library APIs that don't expect utf-8 and when you need to count number of characters etc. For that you can look into existing libraries, e.g. the official Unicode ICU or whatever you can find that others have made, e.g.: https://github.com/nemtrif/utfcpp
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Hence, a higher number means a more popular project.