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Commitff93980

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Improve castNode notation by introducing list-extraction-specific variants.
This extends the castNode() notation introduced by commit5bcab11 toprovide, in one step, extraction of a list cell's pointer and coercion toa concrete node type. For example, "lfirst_node(Foo, lc)" is the sameas "castNode(Foo, lfirst(lc))". Almost half of the uses of castNodethat have appeared so far include a list extraction call, so this ispretty widely useful, and it saves a few more keystrokes compared to theold way.As with the previous patch, back-patch the addition of these macros topg_list.h, so that the notation will be available when back-patching.Patch by me, after an idea of Andrew Gierth's.Discussion:https://postgr.es/m/14197.1491841216@sss.pgh.pa.us
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‎src/include/nodes/pg_list.h‎

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Original file line numberDiff line numberDiff line change
@@ -115,26 +115,32 @@ list_length(const List *l)
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#definelfirst(lc)((lc)->data.ptr_value)
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#definelfirst_int(lc)((lc)->data.int_value)
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#definelfirst_oid(lc)((lc)->data.oid_value)
118+
#definelfirst_node(type,lc)castNode(type, lfirst(lc))
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#definelinitial(l)lfirst(list_head(l))
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#definelinitial_int(l)lfirst_int(list_head(l))
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#definelinitial_oid(l)lfirst_oid(list_head(l))
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#definelinitial_node(type,l)castNode(type, linitial(l))
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#definelsecond(l)lfirst(lnext(list_head(l)))
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#definelsecond_int(l)lfirst_int(lnext(list_head(l)))
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#definelsecond_oid(l)lfirst_oid(lnext(list_head(l)))
128+
#definelsecond_node(type,l)castNode(type, lsecond(l))
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#definelthird(l)lfirst(lnext(lnext(list_head(l))))
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#definelthird_int(l)lfirst_int(lnext(lnext(list_head(l))))
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#definelthird_oid(l)lfirst_oid(lnext(lnext(list_head(l))))
133+
#definelthird_node(type,l)castNode(type, lthird(l))
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#definelfourth(l)lfirst(lnext(lnext(lnext(list_head(l)))))
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#definelfourth_int(l)lfirst_int(lnext(lnext(lnext(list_head(l)))))
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#definelfourth_oid(l)lfirst_oid(lnext(lnext(lnext(list_head(l)))))
138+
#definelfourth_node(type,l)castNode(type, lfourth(l))
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#definellast(l)lfirst(list_tail(l))
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#definellast_int(l)lfirst_int(list_tail(l))
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#definellast_oid(l)lfirst_oid(list_tail(l))
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#definellast_node(type,l)castNode(type, llast(l))
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/*
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* Convenience macros for building fixed-length lists
@@ -209,6 +215,7 @@ extern List *list_truncate(List *list, int new_size);
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externvoid*list_nth(constList*list,intn);
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externintlist_nth_int(constList*list,intn);
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externOidlist_nth_oid(constList*list,intn);
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#definelist_nth_node(type,list,n)castNode(type, list_nth(list, n))
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externboollist_member(constList*list,constvoid*datum);
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externboollist_member_ptr(constList*list,constvoid*datum);

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