A Composable Command Line Parser
summary
A command-line parser library is extracted from Catch, released as Clara, and rewritten for C++11 to make small parsers composable. Each parser returns remaining tokens and an error status; parsers combine with a pipe operator (a monadic bind style) to form a single parser that also emits usage strings. Multiple components expose partial parsers, composition produces predictable CLI behavior, and the resulting system is actively used in Catch2 and on GitHub.
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