1 files changed, 99 insertions, 0 deletions
diff --git a/src/include/catalog/pg_cast.h b/src/include/catalog/pg_cast.h
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+/*-------------------------------------------------------------------------
+ *
+ * pg_cast.h
+ *	  definition of the "type casts" system catalog (pg_cast)
+ *
+ * As of Postgres 8.0, pg_cast describes not only type coercion functions
+ * but also length coercion functions.
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/catalog/pg_cast.h
+ *
+ * NOTES
+ *	  The Catalog.pm module reads this file and derives schema
+ *	  information.
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_CAST_H
+#define PG_CAST_H
+
+#include "catalog/dependency.h"
+#include "catalog/genbki.h"
+#include "catalog/pg_cast_d.h"
+
+/* ----------------
+ *		pg_cast definition.  cpp turns this into
+ *		typedef struct FormData_pg_cast
+ * ----------------
+ */
+CATALOG(pg_cast,2605,CastRelationId)
+{
+	Oid			oid;			/* oid */
+
+	/* source datatype for cast */
+	Oid			castsource BKI_LOOKUP(pg_type);
+
+	/* destination datatype for cast */
+	Oid			casttarget BKI_LOOKUP(pg_type);
+
+	/* cast function; 0 = binary coercible */
+	Oid			castfunc BKI_LOOKUP(pg_proc);
+
+	/* contexts in which cast can be used */
+	char		castcontext;
+
+	/* cast method */
+	char		castmethod;
+} FormData_pg_cast;
+
+/* ----------------
+ *		Form_pg_cast corresponds to a pointer to a tuple with
+ *		the format of pg_cast relation.
+ * ----------------
+ */
+typedef FormData_pg_cast *Form_pg_cast;
+
+#ifdef EXPOSE_TO_CLIENT_CODE
+
+/*
+ * The allowable values for pg_cast.castcontext are specified by this enum.
+ * Since castcontext is stored as a "char", we use ASCII codes for human
+ * convenience in reading the table.  Note that internally to the backend,
+ * these values are converted to the CoercionContext enum (see primnodes.h),
+ * which is defined to sort in a convenient order; the ASCII codes don't
+ * have to sort in any special order.
+ */
+
+typedef enum CoercionCodes
+{
+	COERCION_CODE_IMPLICIT = 'i',	/* coercion in context of expression */
+	COERCION_CODE_ASSIGNMENT = 'a', /* coercion in context of assignment */
+	COERCION_CODE_EXPLICIT = 'e'	/* explicit cast operation */
+} CoercionCodes;
+
+/*
+ * The allowable values for pg_cast.castmethod are specified by this enum.
+ * Since castmethod is stored as a "char", we use ASCII codes for human
+ * convenience in reading the table.
+ */
+typedef enum CoercionMethod
+{
+	COERCION_METHOD_FUNCTION = 'f', /* use a function */
+	COERCION_METHOD_BINARY = 'b',	/* types are binary-compatible */
+	COERCION_METHOD_INOUT = 'i' /* use input/output functions */
+} CoercionMethod;
+
+#endif							/* EXPOSE_TO_CLIENT_CODE */
+
+
+extern ObjectAddress CastCreate(Oid sourcetypeid,
+								Oid targettypeid,
+								Oid funcid,
+								char castcontext,
+								char castmethod,
+								DependencyType behavior);
+
+#endif							/* PG_CAST_H */