Function parsell::character_map_ref

pub fn character_map_ref<F>(f: F) -> Map<CharacterRef<IsSome<F>>, Dereference<Unwrap<F>>> where F: Copy

An uncommitted parser that reads one character by reference and applies a function to it.

The parser character_ref_map(f) reads one character ch from the input, if f(&ch) is Some(value) then it commits and the result is value, otherwise it backtracks.

This does not require characters to be copyable.