glib:variant-type-is-maybe (vtype)

vtype -- a g:variant-type instance

True if vtype is a maybe type.

Determines if the given variant type is a maybe type. This is true if the type string for vtype starts with a "m" type string. This function returns true for any indefinite type for which every definite subtype is a maybe type, the "m*" type string, for example.