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The type {{size_t}} generally covers the entire address space. ISO/IEC TR 24731-1-2007 introduces a new type {{rsize_t}}, defined to be {{size_t}} but explicitly used to hold the size of a single object \[[Meyers 2004|AA. References#MeyersBibliography#Meyers 2004]\]. In code that documents this purpose by using the type {{rsize_t}}, the size of an object can be checked to verify that it is no larger than {{RSIZE_MAX}}, the maximum size of a normal single object, which provides additional input validation for library functions. See [STR07-C. Use TR 24731 for remediation of existing string manipulation code|STR07-C. Use TR 24731 for remediation of existing string manipulation code] for additional discussion of TR 24731-1.

\[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\] Section 7.17, "Common definitions {{<stddef.h>}}", Section 7.20.3, "Memory management functions"
\[[ISO/IEC TR 24731-1:2007|AA. References#ISOBibliography#ISO/IEC TR 24731-1-2007]\]
\[[Meyers 2004|AA. References#MeyersBibliography#Meyers 2004]\]