update c++ highlight support

unixwork / xnedit

A fast and classic X11 text editor, based on NEdit, with full unicode support and antialiased text rendering.

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Closed uap-universe closed 2 years ago

uap-universe commented 2 years ago

add keywords up to C++20
add UTF-8 and UTF-16 char and string literals prefixes
add raw string prefix (R)
add support for grouping separators in numeric literals (e.g. 0x0123'ABCD)
add support for binary literals
add support for alternate operators
try the best to group the keywords into categories (not always working, e.g. for the default keyword)