C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C4306
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     Compiler warning (level 3) C4306
 
     conversion of integral type to pointer of greater size
 
     An integral type was cast to a larger pointer. The unfilled high
     bits of the new type will be zero-filled.
 
     This warning may indicate an unwanted conversion. The resulting
     pointer may not be valid.
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