C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
_HEAP_MAXREQ
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Constant:  _HEAP_MAXREQ
 
  Include:   <malloc.h>
 
  Context:   malloc, calloc
 
  Summary:   The maximum size of a user request for memory that can
             possibly be granted.
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