The & operator is undocumented.

[gamagan]

The & operator is undocumented.

[yhirose]

It's because the And-predicate is in the original PEG syntax described in the document by by Bryan Ford.

Please see the 4th paragraph in README. Thanks.

[gamagan]

It would be helpful to document the original PEG operators on the page, for completeness. A quick mention could remind the users they exist. Something like:

---

The PEG syntax is well described on page 2 in the document by Bryan Ford. cpp-peglib supports the original operators:

• ' ' (Literal string)
• " " (Literal string)
• [ ] (Character class)
• . (Any character)
• (e) (Grouping)
• e? (Optional)
• e* (Zero-or-more)
• e+ (One-or-more)
• &e (And-predicate)
• !e (Not-predicate)
• e1 e2 (Sequence)
• e1 / e2 (Prioritized Choice)

cpp-peglib also supports the following additional syntax for now: