std::iota
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Definido no cabeçalho <numeric> | ||
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) | |
