std::generate
De cppreference.com
<metanoindex/>
<tbody> </tbody>| Definido no cabeçalho <algorithm>
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template< class ForwardIt, class Generator > void generate( ForwardIt first, ForwardIt last, Generator g ); |
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Atribui a cada elemento na faixa
[first, last) um valor gerado pelo objeto função dada g. Original:
Assigns each element in range
[first, last) a value generated by the given function object g. The text has been machine-translated via Google Translate.
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Parâmetros
| first, last | - | a gama de elementos para gerar
Original: the range of elements to generate The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |||||||||
| g | - | generator function object that will be called. The signature of the function should be equivalent to the following: <tbody> </tbody>
The type | |||||||||
| Type requirements | |||||||||||
-ForwardIt must meet the requirements of ForwardIterator.
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Valor de retorno
(Nenhum)
Original:
(none)
The text has been machine-translated via Google Translate.
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Complexidade
Exatamente
std::distance(first, last) invocações de g() e atribuições.Original:
Exactly
std::distance(first, last) invocations of g() and assignments.The text has been machine-translated via Google Translate.
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Possível implementação
template<class ForwardIt, class Generator>
void generate(ForwardIt first, ForwardIt last, Generator g)
{
while (first != last) {
*first++ = g();
}
}
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Exemplo
Os usos de código a seguir preenche um vetor com números aleatórios:
Original:
The following code uses fills a vector with random numbers:
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#include <algorithm>
#include <iostream>
#include <cstdlib>
int main()
{
std::vector<int> v(5);
std::generate(v.begin(), v.end(), std::rand); // Using the C function rand()
std::cout << "v: ";
for (auto iv: v) {
std::cout << iv << " ";
}
std::cout << "\n";
}
Saída:
v: 52894 15984720 41513563 41346135 51451456