std::experimental::ranges::all_of, std::experimental::ranges::any_of, std::experimental::ranges::none_of

 

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技术规范

 

技术规范

文件系统库 (文件系统 TS)

库基础 (库基础 TS)

库基础 2 (库基础 TS v2)

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数学特殊函数 (特殊函数 TR)

 

范围

概念

通用工具

迭代器

范围

算法

 

算法库

不修改序列的操作
all_ofany_ofnone_of countcount_if	findfind_iffind_if_not find_end find_first_of	adjacent_find search search_n mismatch	equal for_each lexicographical_compare
修改序列的操作
copycopy_if copy_n copy_backward move move_backward	fill fill_n generate generate_n swap_ranges shuffle transform	removeremove_if replacereplace_if reverse rotate unique	remove_copyremove_copy_if replace_copyreplace_copy_if reverse_copy rotate_copy unique_copy
划分操作
is_partitioned partition_point	partition partition_copy	stable_partition
排序操作
is_sorted is_sorted_until	sort stable_sort	partial_sort partial_sort_copy	nth_element
二分搜索操作
lower_bound	upper_bound	binary_search	equal_range
集合操作（在已排序范围上）
merge inplace_merge	includes	set_difference set_intersection	set_symmetric_difference set_union
堆操作
is_heap is_heap_until	make_heap sort_heap	push_heap pop_heap
最小/最大操作
max max_element	min min_element	minmax minmax_element
排列
is_permutation	next_permutation	prev_permutation

 

定义于头文件 <experimental/ranges/algorithm>
template< ranges::InputIterator I, ranges::Sentinel<I> S,     class Proj = ranges::identity,     ranges::IndirectUnaryPredicate<ranges::projected<I, Proj>> Pred > bool all_of( I first, S last, Pred pred, Proj proj = Proj{} );	(1)	(范围 TS)
template< ranges::InputRange Rng, class Proj = ranges::identity,     ranges::IndirectUnaryPredicate<         ranges::projected<ranges::iterator_t<Rng>, Proj>     > Pred > bool all_of( Rng&& rng, Pred pred, Proj proj = Proj{} );	(2)	(范围 TS)
template< ranges::InputIterator I, ranges::Sentinel<I> S,     class Proj = ranges::identity,     ranges::IndirectUnaryPredicate<ranges::projected<I, Proj>> Pred > bool any_of( I first, S last, Pred pred, Proj proj = Proj{} );	(3)	(范围 TS)
template< ranges::InputRange Rng, class Proj = ranges::identity,     ranges::IndirectUnaryPredicate<         ranges::projected<ranges::iterator_t<Rng>, Proj>     > Pred > bool any_of( Rng&& rng, Pred pred, Proj proj = Proj{} );	(4)	(范围 TS)
template< ranges::InputIterator I, ranges::Sentinel<I> S,     class Proj = identity,     ranges::IndirectUnaryPredicate<ranges::projected<I, Proj>> Pred > bool none_of( I first, S last, Pred pred, Proj proj = Proj{} );	(5)	(范围 TS)
template< ranges::InputRange Rng, class Proj = ranges::identity,     ranges::IndirectUnaryPredicate<         ranges::projected<ranges::iterator_t<Rng>, Proj>     > Pred > bool none_of( Rng&& rng, Pred pred, Proj proj = Proj{} );	(6)	(范围 TS)

1) 检查一元谓词 pred 是否对范围 [first, last) 中的所有元素返回 true 。

3) 检查一元谓词 pred 是否对范围 [first, last) 中至少一个元素返回 true 。

5) 检查一元谓词 pred 是否不对范围 [first, last) 中任何元素返回 true 。

2,4,6) 同 (1,3,5) ，但以 rng 为源范围，如同使用 ranges::begin(rng) 和 ranges::end(rng) 。

参数

first, last	-	要检验的元素范围
rng	-	要检验的元素范围
pred	-	应用到投影后元素的谓词
proj	-	应用到元素的投影

返回值

1-2) 若 pred 对范围中所有元素返回 true 则为 true ，否则为 false 。若范围为空则返回 true 。

3-4) 若 pred 对范围中至少一个元素返回 true 则为 true ，否则为 false 。若范围为空则返回 false 。

5-6) 若 pred 不对范围中任何元素返回 true 则为 true ，否则为 false 。若范围为空则返回 true 。

复杂度

1-6) 至多应用 last - first 次谓词，应用 last - first 次投影。

可能的实现

版本一
template< ranges::InputIterator I, ranges::Sentinel<I> S, class Proj = ranges::identity, ranges::IndirectUnaryPredicate<ranges::projected<I, Proj>> Pred > bool all_of( I first, S last, Pred pred, Proj proj = Proj{} ) { return ranges::find_if_not(first, last, std::ref(pred), std::ref(proj)) == last; }   template< ranges::InputRange Rng, class Proj = ranges::identity, ranges::IndirectUnaryPredicate<ranges::projected<ranges::iterator_t<Rng>, Proj>> Pred > bool all_of( Rng&& rng, Pred pred, Proj proj = Proj{} ) { return ranges::all_of(ranges::begin(rng), ranges::end(rng), std::ref(pred), std::ref(proj)); }
版本二
template< ranges::InputIterator I, ranges::Sentinel<I> S, class Proj = ranges::identity, ranges::IndirectUnaryPredicate<ranges::projected<I, Proj>> Pred > bool any_of( I first, S last, Pred pred, Proj proj = Proj{} ) { return ranges::find_if(first, last, std::ref(pred), std::ref(proj)) != last; }   template< ranges::InputRange Rng, class Proj = ranges::identity, ranges::IndirectUnaryPredicate<ranges::projected<ranges::iterator_t<Rng>, Proj>> Pred > bool any_of( Rng&& rng, Pred pred, Proj proj = Proj{} ) { return ranges::any_of(ranges::begin(rng), ranges::end(rng), std::ref(pred), std::ref(proj)); }
版本三
template< ranges::InputIterator I, ranges::Sentinel<I> S, class Proj = identity, ranges::IndirectUnaryPredicate<ranges::projected<I, Proj>> Pred > bool none_of( I first, S last, Pred pred, Proj proj = Proj{} ) { return ranges::find_if(first, last, std::ref(pred), std::ref(proj)) == last; }   template< ranges::InputRange Rng, class Proj = ranges::identity, ranges::IndirectUnaryPredicate<ranges::projected<ranges::iterator_t<Rng>, Proj>> Pred > bool none_of( Rng&& rng, Pred pred, Proj proj = Proj{} ) { return ranges::none_of(ranges::begin(rng), ranges::end(rng), std::ref(pred), std::ref(proj)); }

示例

运行此代码

#include <vector>
#include <numeric>
#include <experimental/ranges/algorithm>
#include <experimental/ranges/iterator>
#include <iterator>
#include <iostream>
#include <functional>
 
namespace ranges = std::experimental::ranges;
 
int main()
{
    std::vector<int> v(10, 2);
    std::partial_sum(v.cbegin(), v.cend(), v.begin());
    std::cout << "Among the numbers: ";
    ranges::copy(v, ranges::ostream_iterator<int>(std::cout, " "));
    std::cout << '\n';
 
    if (ranges::all_of(v.cbegin(), v.cend(), [](int i){ return i % 2 == 0; })) {
        std::cout << "All numbers are even\n";
    }
    if (ranges::none_of(v, std::bind(std::modulus<int>(), std::placeholders::_1, 2))) {
        std::cout << "None of them are odd\n";
    }
    struct DivisibleBy
    {
        const int d;
        DivisibleBy(int n) : d(n) {}
        bool operator()(int n) const { return n % d == 0; }
    };
 
    if (ranges::any_of(v, DivisibleBy(7))) {
        std::cout << "At least one number is divisible by 7\n";
    }
}

输出：

Among the numbers: 2 4 6 8 10 12 14 16 18 20 
All numbers are even
None of them are odd
At least one number is divisible by 7

参阅

all_ofany_ofnone_of (C++11)(C++11)(C++11)

检查谓词是否对范围中所有、任一或无元素为 true (函数模板)