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      size_t

      De cppreference.com
      < c | types

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      Definido no cabeçalho <stddef.h>
      Definido no cabeçalho <stdio.h>
      Definido no cabeçalho <string.h>
      Definido no cabeçalho <time.h>
      typedef /*implementation-defined*/ size_t;
      size_t é do tipo unsigned inteira do resultado do operador sizeof eo operador alignof.
      Original:
      size_t is the unsigned integer type of the result of the sizeof operator and the alignof operator.
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      Notas

      size_t pode armazenar o tamanho máximo de um objeto, teoricamente possível, de qualquer tipo (incluindo matriz). Em muitas plataformas (uma exceção são sistemas com endereçamento segmentado) size_t pode armazenar o valor de qualquer ponteiro não-membro, caso em que é sinônimo de uintptr_t.
      Original:
      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.
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      size_t é comumente utilizado para indexação de matriz e contagem de loop. Programas que usam outros tipos, como unsigned int, para indexação de matriz pode falhar em, por exemplo, Sistemas de 64 bits em que o índice excede UINT_MAX ou se se baseia em 32 bits aritmética modular.
      Original:
      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.
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      Veja também
      assinado tipo inteiro retornado quando subtraindo dois ponteiros
      Original:
      signed integer type returned when subtracting two pointers
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      (typedef) [edit]
      		byte offset from the beginning of a struct type to specified member
      (função macro) [edit]
      C++ documentation for size_t