Merge pull request #1526 from Citadel-Station-13/upstream-merge-28266

[MIRROR] LAZYSET() Macro

code/__HELPERS/_lists.dm

@@ -451,13 +451,12 @@
 
 //Picks from the list, with some safeties, and returns the "default" arg if it fails
 #define DEFAULTPICK(L, default) ((istype(L, /list) && L:len) ? pick(L) : default)
-
 #define LAZYINITLIST(L) if (!L) L = list()
-
 #define UNSETEMPTY(L) if (L && !L.len) L = null
 #define LAZYREMOVE(L, I) if(L) { L -= I; if(!L.len) { L = null; } }
 #define LAZYADD(L, I) if(!L) { L = list(); } L += I;
 #define LAZYACCESS(L, I) (L ? (isnum(I) ? (I > 0 && I <= L.len ? L[I] : null) : L[I]) : null)
+#define LAZYSET(L, K, V) if(!L) { L = list(); } L[K] = V;
 #define LAZYLEN(L) length(L)
 #define LAZYCLEARLIST(L) if(L) L.Cut()
 #define SANITIZE_LIST(L) ( islist(L) ? L : list() )