Add improved additional C++ syntax highlighting

after/syntax/cpp.vim

@@ -0,0 +1,30 @@
+" File: cpp.vim
+" Language: C++
+" Description: Additional C++ syntax file.
+" Author: Kenneth Benzie (Benie) k.benzie83@gmail.com
+" Last Modified: September 02, 2016
+
+" Match delimiter expressions: <expr>, (expr) {expr} ex::pr
+"                              ^    ^  ^    ^ ^    ^   ^^
+syn match cppDelimiter '\([()\[\]{}<>]\|::\)'
+" Match keyword logic operators
+syn keyword cppOperator and and_eq bitand bitor compl
+syn keyword cppOperator not not_eq or or_eq xor xor_eq
+" Match single character operators, ordering within the [] is important
+syn match cppOperator '[\*=\.\^\~+-,;&|!%]'
+" Match single character operators if they are surrounded by white space: / < >
+"                                                                         ^ ^ ^
+syn match cppOperator '\(\s\zs\/\s\ze\|\s\zs<\s\ze\|\s\zs>\s\ze\)'
+" Match multi character operators
+syn match cppOperator '\(+=\|-=\|\*=\|/=\|%=\|\ˆ=\|&=\||=\|<<\|>>\|>>=\)'
+syn match cppOperator '\(<<=\|==\|!=\|<=\|>=\|&&\|||\|++\|--\|->\*\|->\)'
+" Match function expressions: foo()
+"                             ^^^
+syn match cppFunction '\w[A-Za-z0-9_]*\ze\s*('
+" Match nested namespace expressions: expr::
+"                                     ^^^^
+syn match cppStorageClass '\w[A-Za-z0-9_]*\ze::'
+
+" Define additional highlight groups
+hi default link cppDelimiter Delimiter
+hi default link cppFunction Function