I want to change the highlighting of the function names inside a c++ file, here is an example
As you can see in the previous picture functions names have their own color,
parser(), parse(), get_headers(), get_http_version().
The default vim cpp syntax lacks highlight group for function and class names, there is an enhanced cpp syntax that defines much more language constructs than the default.
You can change the function colors using this:
hi clear cppSTLfunction hi cppSTLfunction ctermfg=74