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std::array

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std::array
Funções de membro
Original:
Member functions
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acesso. Elemento
Original:
Element access
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array::at
array::operator[]
array::front
array::back
array::data
Iteradores
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Iterators
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array::begin
array::cbegin
array::end
array::cend
array::rbegin
array::crbegin
array::rend
array::crend
Capacidade
Original:
Capacity
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array::empty
array::size
array::max_size
Modificadores
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Modifiers
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array::fill
array::swap
Não-membros funções
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Non-member functions
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get
swap
Classes auxiliares
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Helper classes
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tuple_size
tuple_element
 
Defined in header <array>
template<

    class T,
    std::size_t N

> struct array;
(a partir do C++ 11)

std::array é um contêiner que encapsula um array de tamanho constante.

Esta estrutura possui a mesma semântica de tipo agregado que o array estilo C. O tamanho e a eficiência do array<T,N>, para uma certa quantidade de elementos, são equivalentes ao array T[N] estilo C correspondente. A estrutura provê os benefícios de um contêiner padrão, tais como o próprio tamanho, suporte a atribuição, acesso randômico, iteradores, etc.

Há um caso especial para array de tamanho zero ((N == 0)). Nesse caso, array.begin() == array.end(), que é algum valor único. O efeito de chamar front() or back() ou back() em um array de tamanho zero é indefinido.

array é um agregado (não possui construtores nem membros privados ou protegidos), o que o permite usar aggregate-initialization.

Um array também pode ser usado como uma tupla de N elementos do mesmo tipo.

Índice

[editar] Tipos membro

Tipo de membro
Original:
Member type
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Definition
value_type T [edit]
size_type size_t [edit]
difference_type ptrdiff_t [edit]
reference value_type& [edit]
const_reference const value_type& [edit]
pointer T*[edit]
const_pointer const T*[edit]
iterator RandomAccessIterator [edit]
const_iterator
Iterador constante acesso aleatório
Original:
Constant random access iterator
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[edit]
reverse_iterator std::reverse_iterator<iterator> [edit]
const_reverse_iterator std::reverse_iterator<const_iterator> [edit]

[editar] Funções membro

acesso. Elemento
Original:
Element access
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acessar o elemento especificado com verificação de limites
Original:
access specified element with bounds checking
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(função pública membro) [edit]
acessar o elemento especificado
Original:
access specified element
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(função pública membro) [edit]
acesso ao primeiro elemento
Original:
access the first element
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(função pública membro) [edit]
access the last element
(função pública membro) [edit]
(C++11)
acesso directo para a matriz subjacente
Original:
direct access to the underlying array
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(função pública membro) [edit]
Iteradores
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Iterators
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retorna um iterador para o começo
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returns an iterator to the beginning
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(função pública membro) [edit]
retorna um iterador para o fim
Original:
returns an iterator to the end
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(função pública membro) [edit]
retorna um iterador inverso ao início
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returns a reverse iterator to the beginning
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(função pública membro) [edit]
retorna um iterador inverso até ao fim
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returns a reverse iterator to the end
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(função pública membro) [edit]
Capacidade
Original:
Capacity
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verifica se o recipiente estiver vazio
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checks whether the container is empty
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(função pública membro) [edit]
devolve o número de elementos
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returns the number of elements
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(função pública membro) [edit]
retorna o número máximo possível de elementos
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returns the maximum possible number of elements
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(função pública membro) [edit]
Operações
Original:
Operations
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encher o recipiente com o valor especificado
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fill the container with specified value
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(função pública membro) [edit]
Trocar o conteúdo
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swaps the contents
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(função pública membro) [edit]

[editar] Não-membros funções

lexicographically compara os valores na array
Original:
lexicographically compares the values in the array
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(modelo de função) [edit]
accesses an element of an array
(modelo de função) [edit]
o algoritmo especializado std::swap
Original:
specializes the std::swap algorithm
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(modelo de função) [edit]

[editar] Classes auxiliares

obtém o tamanho de um array
Original:
obtains the size of an array
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(especialização modelo. classe) [edit]
obtém o tipo dos elementos de array
Original:
obtains the type of the elements of array
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(especialização modelo. classe) [edit]

[editar] Exemplo

#include <string>
#include <iterator>
#include <iostream>
#include <algorithm>
#include <array>
 
int main()
{
    // construction uses aggregate initialization
    std::array<int, 3> a1{ {1,2,3} };    // double-braces required
    std::array<int, 3> a2 = {1, 2, 3}; // except after =
    std::array<std::string, 2> a3 = { {std::string("a"), "b"} };
 
    // container operations are supported
    std::sort(a1.begin(), a1.end());
    std::reverse_copy(a2.begin(), a2.end(), std::ostream_iterator<int>(std::cout, " "));
 
    // ranged for loop is supported
    for(auto& s: a3)
        std::cout << s << ' ';
}

Output:

3 2 1 a b