size_t
From cppreference.com
| Defined in header
<stddef.h>
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| Defined in header
<stdio.h>
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| Defined in header
<string.h>
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| Defined in header
<time.h>
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| typedef /*implementation-defined*/ size_t;
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size_t is the unsigned integer type of the result of the sizeof operator and the alignof operator.
[edit] Notes
size_t can store the maximum size of a theoretically possible object of any type (including array). On many platforms (an exception are systems with segmented addressing) size_t can safely store the value of any non-member pointer, in which case it is synonymous with uintptr_t.
size_t is commonly used for array indexing and loop counting. Programs that use other types, such as unsigned int, for array indexing may fail on, e.g. 64-bit systems when the index exceeds UINT_MAX or if it relies on 32-bit modular arithmetic.
[edit] See also
| signed integer type returned when subtracting two pointers (typedef) |
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| byte offset from the beginning of a struct type to specified member (function macro) |
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