std::iota
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| Definido no cabeçalho <numeric>
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| template< class ForwardIterator, class T > void iota( ForwardIterator first, ForwardIterator last, T value ); |
(desde C++11) | |
Preenche o intervalo
[first, last) com valores crescentes consecutivos, começando com value e repetidamente calculando ++value.Original:
Fills the range
[first, last) with sequentially increasing values, starting with value and repetitively evaluating ++value.The text has been machine-translated via Google Translate.
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Operação equivalente:
Original:
Equivalent operation:
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*(d_first) = value; *(d_first+1) = ++value; *(d_first+2) = ++value; *(d_first+3) = ++value; ...
Índice |
[editar] Parâmetros
| first, last | - | a gama de elementos a soma
Original: the range of elements to sum The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| value | - | valor inicial para a loja, a expressão + + valor deve ser bem formado
Original: initial value to store, the expression ++value must be well-formed The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[editar] Valor de retorno
(Nenhum)
Original:
(none)
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[editar] Complexidade
Exatamente
last - first incrementos e atribuições.Original:
Exactly
last - first increments and assignments.The text has been machine-translated via Google Translate.
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[editar] Possível implementação
template<class ForwardIterator, class T> void iota(ForwardIterator first, ForwardIterator last, T value) { while(first != last) { *first++ = value; ++value; } } |
[editar] Exemplo
O exemplo que se segue aplica-se a um vector std::random_shuffle de iteradores para um std::list desde std::random_shuffle não pode ser aplicado directamente a uma std::list. std::iota é usada para criar o vector .
Original:
The following example applies std::random_shuffle to a vector of iterators to a std::list since std::random_shuffle cannot be applied to an std::list directly. std::iota is used to create the vector.
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#include <numeric> #include <algorithm> #include <list> #include <vector> #include <iostream> int main() { std::list<int> l(10); std::iota(l.begin(), l.end(), -4); std::vector<std::list<int>::iterator> v(l.size()); std::iota(v.begin(), v.end(), l.begin()); std::random_shuffle(v.begin(), v.end()); std::cout << "Contents of the list: "; for(auto n: l) { std::cout << n << ' '; } std::cout << '\n'; std::cout << "Contents of the list, shuffled: "; for(auto i: v) { std::cout << *i << ' '; } std::cout << '\n'; }
Saída:
Contents of the list: -4 -3 -2 -1 0 1 2 3 4 5 Contents of the list, shuffled: 0 -1 3 4 -4 1 -2 -3 2 5
[editar] Veja também
| atribui um intervalo de elementos de um certo valor Original: assigns a range of elements a certain value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) | |
| guarda o resultado de uma função em um intervalo Original: saves the result of a function in a range The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) | |
