std::size_t
De cppreference.com
<metanoindex/>
<tbody> </tbody>| 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.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
std::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:
std::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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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;
}