std::is_heap

 

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功能 Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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all_of any_of none_of （C++11） （C++11） （C++11） for_each count count_if mismatch equal	find find_if find_if_not （C++11） find_end find_first_of adjacent_find search search_n
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is_heap is_heap_until （C++11） make_heap	push_heap pop_heap sort_heap
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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)

检查是否[first, last)中的元素范围是一个“堆”.....

Original:

Checks if the elements in range [first, last) are a heap.

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第一个版本的is_heap使用operator<比较的元素，而第二个使用给定的比较函数comp的

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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参数

first, last	-	检查的元素 Original: the range of elements to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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.

返回值

true如果范围是“堆”，false否则.

Original:

true if the range is heap, false otherwise.

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复杂性

线性first和last之间的距离

Original:

Linear in the distance between first and last

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注释

A“堆”是一个范围的元素[f,l)具有以下属性：

Original:

A heap is a range of elements [f,l) that has the following properties:

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• *f范围中的最大元素

  Original:

  *f is the largest element in the range

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• 可以添加一个新的元素，使用std::push_heap()

  Original:

  a new element can be added using std::push_heap()

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• 使用std::pop_heap()的第一个元素可以被删除

  Original:

  the first element can be removed using std::pop_heap()

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实际配置是实现定义的元素.

Original:

The actual arrangement of the elements is implementation defined.

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为例

#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

另请参阅

is_heap_until （C++11）	发现是堆的最大子区间 Original: finds the largest subrange that is heap The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）