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std::is_heap

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< cpp‎ | algorithm

 
 
Biblioteca algoritmo
Funções
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Functions
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Não modificar operações de seqüência
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Non-modifying sequence operations
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Modificando operações de seqüência
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Modifying sequence operations
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Particionamento operações
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Partitioning operations
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Operações de classificação (em intervalos ordenados)
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Sorting operations (on sorted ranges)
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Binários operações de busca (em intervalos ordenados)
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Binary search operations (on sorted ranges)
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Definir operações (em intervalos ordenados)
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Set operations (on sorted ranges)
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Operações de pilha
Original:
Heap operations
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is_heap
is_heap_until(C++11)
make_heap
Mínimo / máximo de operações
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Minimum/maximum operations
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Operações numéricas
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Numeric operations
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C biblioteca
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C library
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Defined in header <algorithm>
template< class RandomIt >
bool is_heap( RandomIt first, RandomIt last );
(1)
template< class RandomIt, class Compare >
bool is_heap( RandomIt first, RandomIt last, Compare comp );
(2)
Verifica se os elementos em escala [first, last) são um amontoado'.
Original:
Checks if the elements in range [first, last) are a heap.
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A primeira versão do is_heap usa operator< comparar elementos, enquanto o segundo usa a função de comparação dada comp.
Original:
The first version of is_heap uses operator< to compare elements, whereas the second uses the given comparison function comp.
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Índice

[editar] Parâmetros

first, last -
a gama de elementos para examinar
Original:
the range of elements to examine
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comp - comparison function which returns ​true if the first argument is less than the second.

The signature of the comparison function should be equivalent to the following:

 bool cmp(const Type1 &a, const Type2 &b);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The types Type1 and Type2 must be such that an object of type RandomIt can be dereferenced and then implicitly converted to both of them. ​

Type requirements
-
RandomIt must meet the requirements of RandomAccessIterator.

[editar] Valor de retorno

true se o intervalo é de pilha', false outra forma.
Original:
true if the range is heap, false otherwise.
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[editar] Complexidade

Linear da distância entre first e last
Original:
Linear in the distance between first and last
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[editar] Notas

Uma pilha' é uma gama de elementos [f,l) que tem as seguintes propriedades:
Original:
A heap is a range of elements [f,l) that has the following properties:
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  • *f é o maior elemento no intervalo
    Original:
    *f is the largest element in the range
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  • um novo elemento pode ser adicionado usando std::push_heap()
    Original:
    a new element can be added using std::push_heap()
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  • o primeiro elemento pode ser removido usando std::pop_heap()
    Original:
    the first element can be removed using std::pop_heap()
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O real disposição dos elementos é definido pela implementação.
Original:
The actual arrangement of the elements is implementation defined.
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[editar] Exemplo

#include <iostream>
#include <algorithm>
 
int main()
{
    std::vector<int> v { 3, 1, 4, 1, 5, 9 };
 
    std::cout << "initially, v: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
 
    if (!std::is_heap(v.begin(), v.end())) {
        std::cout << "making heap...\n";
        std::make_heap(v.begin(), v.end());
    }
 
    std::cout << "after make_heap, v: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
}

Output:

initially, v: 3 1 4 1 5 9 
making heap...
after make_heap, v: 9 5 4 1 1 3

[editar] Veja também

encontra o maior subrange que é heap
Original:
finds the largest subrange that is heap
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(modelo de função) [edit]