Compares this and
The types of this and
gconstpointer only to allow use of this function with
Tree, GenericArray, etc. They
must each be a Variant.
Comparison is only defined for basic types (ie: booleans, numbers, strings). For booleans, false is less than true. Numbers are ordered in the usual way. Strings are in ASCII lexographical order.
It is a programmer error to attempt to compare container values or two values that have types that are not exactly equal. For example, you cannot compare a 32-bit signed integer with a 32-bit unsigned integer. Also note that this function is not particularly well-behaved when it comes to comparison of doubles; in particular, the handling of incomparable values (ie: NaN) is undefined.
If you only require an equality comparison, equal is more general.
a basic-typed Variant instance
a Variant instance of the same type
negative value if a < b; zero if a = b; positive value if a > b.