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Function `dmd.mtype.Type.covariant`

Covariant means that 'this' can substitute for 't', i.e. a pure function is a match for an impure type.


						
				final extern(C++) int covariant
				(
				

				  Type t,
				

				  ulong* pstc = null,
				

				  bool fix17349 = true
				

				);

Parameters

Name	Description
t	type 'this' is covariant with
pstc	if not null, store STCxxxx which would make it covariant
fix17349	enable fix https://issues.dlang.org/show_bug.cgi?id=17349

Returns

0 types are distinct 1 this is covariant with t 2 arguments match as far as overloading goes, but types are not covariant 3 cannot determine covariance because of forward references *pstc STCxxxx which would make it covariant

Authors

Walter Bright

License

Boost License 1.0