std::includes
: cppreference.com
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| (1) | ||
template< class InputIt1, class InputIt2 > bool includes( InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2 ); |
(C++20) | |
template< class InputIt1, class InputIt2 > constexpr bool includes( InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2 ); |
(C++20) | |
template< class ExecutionPolicy, class ForwardIt1, class ForwardIt2 > bool includes( ExecutionPolicy&& policy, ForwardIt1 first1, ForwardIt1 last1, ForwardIt2 first2, ForwardIt2 last2 ); |
(2) | (C++17) |
| (3) | ||
template< class InputIt1, class InputIt2, class Compare > bool includes( InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, Compare comp ); |
(C++20) | |
template< class InputIt1, class InputIt2, class Compare > constexpr bool includes( InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, Compare comp ); |
(C++20) | |
template< class ExecutionPolicy, class ForwardIt1, class ForwardIt2, class Compare > bool includes( ExecutionPolicy&& policy, ForwardIt1 first1, ForwardIt1 last1, ForwardIt2 first2, ForwardIt2 last2, Compare comp ); |
(4) | (C++17) |
[first2, last2) [first1, last1) true ()
1)
operator< 3)
comp 2,4) (1,3)
policy std::is_execution_policy_v<std::decay_t<ExecutionPolicy>> true | first1, last1 | - | |
| first2, last2 | - | |
| policy | - | |
| comp | - | 2 () true (Compare )
|
-InputIt1, InputIt2 LegacyInputIterator
| ||
-ForwardIt1, ForwardIt2 LegacyForwardIterator
| ||
[first2, last2) [first1, last1) true false
2·(N1+N2-1) N1 = std::distance(first1, last1) N2 = std::distance(first2, last2)
ExecutionPolicy
-
ExecutionPolicystd::terminateExecutionPolicy - std::bad_alloc
| 1 |
|---|
template<class InputIt1, class InputIt2>
bool includes(InputIt1 first1, InputIt1 last1,
InputIt2 first2, InputIt2 last2)
{
for (; first2 != last2; ++first1)
{
if (first1 == last1 || *first2 < *first1)
return false;
if ( !(*first1 < *first2) )
++first2;
}
return true;
}
|
| 2 |
template<class InputIt1, class InputIt2, class Compare>
bool includes(InputIt1 first1, InputIt1 last1,
InputIt2 first2, InputIt2 last2, Compare comp)
{
for (; first2 != last2; ++first1)
{
if (first1 == last1 || comp(*first2, *first1))
return false;
if (!comp(*first1, *first2))
++first2;
}
return true;
}
|
Run this code
#include <iostream>
#include <algorithm>
#include <cctype>
#include <vector>
int main()
{
std::vector<char> v1 {'a', 'b', 'c', 'f', 'h', 'x'};
std::vector<char> v2 {'a', 'b', 'c'};
std::vector<char> v3 {'a', 'c'};
std::vector<char> v4 {'g'};
std::vector<char> v5 {'a', 'c', 'g'};
for (auto i : v1) std::cout << i << ' ';
std::cout << "\nincludes:\n" << std::boolalpha;
for (auto i : v2) std::cout << i << ' ';
std::cout << ": " << std::includes(v1.begin(), v1.end(), v2.begin(), v2.end()) << '\n';
for (auto i : v3) std::cout << i << ' ';
std::cout << ": " << std::includes(v1.begin(), v1.end(), v3.begin(), v3.end()) << '\n';
for (auto i : v4) std::cout << i << ' ';
std::cout << ": " << std::includes(v1.begin(), v1.end(), v4.begin(), v4.end()) << '\n';
for (auto i : v5) std::cout << i << ' ';
std::cout << ": " << std::includes(v1.begin(), v1.end(), v5.begin(), v5.end()) << '\n';
auto cmp_nocase = [](char a, char b) {
return std::tolower(a) < std::tolower(b);
};
std::vector<char> v6 {'A', 'B', 'C'};
for (auto i : v6) std::cout << i << ' ';
std::cout << ": (case-insensitive) "
<< std::includes(v1.begin(), v1.end(), v6.begin(), v6.end(), cmp_nocase)
<< '\n';
}
:
a b c f h x
includes:
a b c : true
a c : true
g : false
a c g : false
A B C : (case-insensitive) true
| 2 () | |
| () |