Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 12]

▼NGsv
CBuffer	Buffer object for View
CCompletion	Main Completion Object
CCompletionContext	CompletionContext
CCompletionInfo	Calltips object
CCompletionItem	CompletionItem
CCompletionProposal	Completion proposal object
CCompletionProvider	Completion provider interface
CCompletionWords	Words completion provider
CGutter	Gutter object for View
CGutterRenderer
CGutterRendererPixbuf
CGutterRendererText
CLanguage	Object representing a syntax highlighted language
CLanguageManager	Class which provides access to SourceLanguages
CMark	Mark class for Buffer
CMarkAttributes
CMarkup	It is just a class holding markup string
CPrintCompositor	Compose a Buffer for printing
CSourceCompletionError
CStyle	Class representing a style
CStyleScheme	Object controlling appearance of View
CStyleSchemeManager	Class providing access to SourceStyleSchemes
CUndoManager	Undo manager interface for View
CView	The view object