Description

The single-character parser. The produced attribute is the type of the matched code point (char or char32_t). Used as-is, char_ matches any code point. char_ can also can be used to create code point parsers that match one or more specific code point values, by calling it with: a single value comparable to a code point; a closed range of code point values [lo, hi], or a set of code point values passed as a range. When calling with a range, only the iterators that bound the range are stored. Make sure the range you pass outlives the use of the resulting parser. Note that a string literal is a range, and that it outlives any parser it is used to construct.