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

 

C++

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Feature test macros (C++20)

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Concepts library (C++20)

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Ranges library (C++20)

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Technical specifications

Symbols index

External libraries

 

Technical specifications

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals TS v2)

Library fundamentals 3 (library fundamentals TS v3)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Extensions for concurrency 2 (concurrency TS v2)

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Reflection (reflection TS)

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Ranges

Concepts

General utilities

Iterators

Ranges

Algorithms

 

Algorithms library

Non-modifying sequence operations
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
Modifying sequence operations
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
Partitioning operations
is_partitioned partition_point	partition partition_copy	stable_partition
Sorting operations
is_sorted is_sorted_until	sort stable_sort	partial_sort partial_sort_copy	nth_element
Binary search operations
lower_bound	upper_bound	binary_search	equal_range
Set operations (on sorted ranges)
merge inplace_merge	includes	set_difference set_intersection	set_symmetric_difference set_union
Heap operations
is_heap is_heap_until	make_heap sort_heap	push_heap pop_heap
Minimum/maximum operations
max max_element	min min_element	minmax minmax_element
Permutations
is_permutation	next_permutation	prev_permutation

 

Defined in header <experimental/ranges/algorithm>
template< InputIterator I, Sentinel<I> S, class Proj = ranges::identity,           IndirectUnaryPredicate<projected<I, Proj>> Pred > bool all_of( I first, S last, Pred pred, Proj proj = Proj{} );	(1)	(ranges TS)
template< InputRange R, class Proj = ranges::identity,           IndirectUnaryPredicate<projected<ranges::iterator_t<R>, Proj>> Pred > bool all_of( R&& r, Pred pred, Proj proj = Proj{} );	(2)	(ranges TS)
template< InputIterator I, Sentinel<I> S, class Proj = ranges::identity,           IndirectUnaryPredicate<projected<I, Proj>> Pred > bool any_of( I first, S last, Pred pred, Proj proj = Proj{} );	(3)	(ranges TS)
template< InputRange R, class Proj = ranges::identity,           IndirectUnaryPredicate<projected<ranges::iterator_t<R>, Proj>> Pred > bool any_of( R&& r, Pred pred, Proj proj = Proj{} );	(4)	(ranges TS)
template< InputIterator I, Sentinel<I> S, class Proj = identity,           IndirectUnaryPredicate<projected<I, Proj>> Pred > bool none_of( I first, S last, Pred pred, Proj proj = Proj{} );	(5)	(ranges TS)
template< InputRange R, class Proj = ranges::identity,           IndirectUnaryPredicate<projected<ranges::iterator_t<R>, Proj>> Pred > bool none_of( R&& r, Pred pred, Proj proj = Proj{} );	(6)	(ranges TS)

1) Checks if unary predicate pred returns true for all elements in the range [first, last).

3) Checks if unary predicate pred returns true for at least one element in the range [first, last).

5) Checks if unary predicate pred returns true for no elements in the range [first, last).

2,4,6) Same as (1,3,5), but uses r as the source range, as if using ranges::begin(r) as first and ranges::end(r) as last.

Notwithstanding the declarations depicted above, the actual number and order of template parameters for algorithm declarations is unspecified. Thus, if explicit template arguments are used when calling an algorithm, the program is probably non-portable.

Parameters

first, last	-	the range of the elements to examine
r	-	the range of the elements to examine
pred	-	predicate to apply to the projected elements
proj	-	projection to apply to the elements

Return value

1-2) true if pred returns true for all elements in the range, false otherwise. Returns true if the range is empty.

3-4) true if pred returns true for at least one element in the range, false otherwise. Returns false if the range is empty.

5-6) true if pred returns true for no elements in the range, false otherwise. Returns true if the range is empty.

Complexity

1-6) At most last - first applications of the predicate and last - first applications of the projection.

Possible implementation

First version
template<InputIterator I, Sentinel<I> S, class Proj = ranges::identity, IndirectUnaryPredicate<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<InputRange R, class Proj = ranges::identity, IndirectUnaryPredicate<projected<ranges::iterator_t<R>, Proj>> Pred> bool all_of(R&& r, Pred pred, Proj proj = Proj{}) { return ranges::all_of(ranges::begin(r), ranges::end(r), std::ref(pred), std::ref(proj)); }
Second version
template<InputIterator I, Sentinel<I> S, class Proj = ranges::identity, IndirectUnaryPredicate<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<InputRange R, class Proj = ranges::identity, IndirectUnaryPredicate<projected<ranges::iterator_t<R>, Proj>> Pred> bool any_of(R&& r, Pred pred, Proj proj = Proj{}) { return ranges::any_of(ranges::begin(r), ranges::end(r), std::ref(pred), std::ref(proj)); }
Third version
template<InputIterator I, Sentinel<I> S, class Proj = identity, IndirectUnaryPredicate<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<InputRange R, class Proj = ranges::identity, IndirectUnaryPredicate<projected<ranges::iterator_t<R>, Proj>> Pred> bool none_of(R&& r, Pred pred, Proj proj = Proj{}) { return ranges::none_of(ranges::begin(r), ranges::end(r), std::ref(pred), std::ref(proj)); }

Example

Run this code

#include <experimental/ranges/algorithm>
#include <experimental/ranges/iterator>
#include <functional>
#include <iostream>
#include <iterator>
#include <numeric>
#include <vector>
 
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";
}

Output:

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

See also

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

checks if a predicate is true for all, any or none of the elements in a range (function template)