std::size_t
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Definido no cabeçalho <cstddef> | ||
Definido no cabeçalho <cstdio> | ||
Definido no cabeçalho <cstring> | ||
Definido no cabeçalho <ctime> | ||
typedef/*implementation-defined*/ size_t; | ||
std::size_t é do tipo unsigned inteira do resultado do operador sizeof eo operador alignof.
Original:
std::size_t is the unsigned integer type of the result of the sizeof operator and the alignof operator.
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[editar]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) std :: size_t pode armazenar o valor de qualquer ponteiro não-membro, caso em que é sinônimo de std::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) std::size_t can safely store the value of any non-member pointer, in which case it is synonymous with std::uintptr_t.
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std::size_t é comumente utilizado para indexação de matriz e contagem de loop. Programas que usam outros tipos, como unsignedint, 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:
std::size_t is commonly used for array indexing and loop counting. Programs that use other types, such as unsignedint, 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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Quando a indexação C + +, tais como recipientes de std::string, std::vector, etc, do tipo apropriado é o membro size_type typedef fornecida por esses recipientes. Ele é geralmente definida como um sinônimo para std::size_t.
Original:
When indexing C++ containers, such as std::string, std::vector, etc, the appropriate type is the member typedef size_type provided by such containers. It is usually defined as a synonym for std::size_t.
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[editar]Exemplo
#include <cstddef>int main(){const std::size_t N =100;int* a = new int[N];for(std::size_t n =0; n<N;++n) a[n]= n; delete[] a;}
[editar]Veja também
assinado tipo inteiro retornado quando subtraindo dois ponteiros Original: signed integer type returned when subtracting two pointers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (typedef) | |
byte offset do início de um tipo padrão de disposição-membro especificado Original: byte offset from the beginning of a standard-layout type to specified member The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função macro) | |
