type
size_t
<cstdlib>
Unsigned integral type
size_t corresponds to the integer data type returned by the language operator
sizeof and is defined in the
<cstdlib> header file (among others) as an unsigned integer type.
In
<cstlib>, it is used as the type of some parameters in the functions
bsearch,
qsort,
calloc,
malloc,
realloc,
mblen,
mbtowc,
mbstowcs and
wcstombs, and in the case of
mbstowcs and
wcstombs also as its returning type.
In all cases it is used as a type to represent the length or count in bytes of a specific buffer or string.