first

Determines the first item type of a tuple or dictionary entry type.

This function may only be used with tuple or dictionary entry types, but must not be used with the generic tuple type g_variant_type_tuple.

In the case of a dictionary entry type, this returns the type of the key.

null is returned in case of this being g_variant_type_unit.

This call, together with next provides an iterator interface over tuple and dictionary entry types.

Parameters:

this	a tuple or dictionary entry VariantType

Returns:

the first item type of this, or null Since 2.24