std::includes
Defined in header <algorithm> | ? | ? |
|---|---|---|
template< class InputIt1, class InputIt2 > bool includes( InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2 ); | (1) | ? |
template< class ExecutionPolicy, class ForwardIt1, class ForwardIt2 > bool includes( ExecutionPolicy&& policy, ForwardIt1 first1, ForwardIt1 last1, ForwardIt2 first2, ForwardIt2 last2 ); | (2) | (since C++17) |
template< class InputIt1, class InputIt2, class Compare > bool includes( InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, Compare comp ); | (3) | ? |
template< class ExecutionPolicy, class ForwardIt1, class ForwardIt2, class Compare > bool includes( ExecutionPolicy&& policy, ForwardIt1 first1, ForwardIt1 last1, ForwardIt2 first2, ForwardIt2 last2, Compare comp ); | (4) | (since C++17) |
回报true如果排序范围中的每个元素[first2, last2)在排序范围内找到。[first1, last1).也返回true如果[first2, last2)是空的。
1%29两个范围都必须与operator<...
3%29两个范围都必须按照给定的比较函数排序。comp...
2，4%29与%281，3%29相同，但根据policy。此重载只参与以下情况下的过载解决方案：std::is_execution_policy_v<std::decay_t<ExecutionPolicy>>是真的
参数
first1, last1 | - | the sorted range of elements to examine |
|---|---|---|
first2, last2 | - | the sorted range of elements to search for |
policy | - | the execution policy to use. See execution policy for details. |
comp | - | comparison function object (i.e. an object that satisfies the requirements of Compare) which returns ?true if the first argument is less than (i.e. is ordered before) 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 object must not modify the objects passed to it. The types Type1 and Type2 must be such that an object of type InputIt can be dereferenced and then implicitly converted to both of them. ? |
类型要求
-InputIt 1，InputIt 2必须符合InputIterator的要求。
-前进1，前进2必须符合先行者的要求。
返回值
true如果每个元素[first2, last2)是...的成员[first, last)...
复杂性
最多2.%28N1+N2-1%29比较，其中N1=std::distance(first1, last1)和N2=std::distance(first2, last2)...
例外
带有名为ExecutionPolicy报告错误如下：
- 如果执行作为算法一部分调用的函数，则引发异常
ExecutionPolicy是其中之一标准政策，，，std::terminate叫做。对于任何其他人ExecutionPolicy，行为是由实现定义的。
- 如果算法不能分配内存，
std::bad_alloc被扔了。
可能的实施
第一版
*。
模板<class InputIt 1，类InputIt 2>bool包括%28InputIt1first 1、InputIt1last1、InputIt2first 2、InputIt2 last2%29(表示%28；First 2%21=last2；++first 1%29{if%28first 1==last1)。%2A头2<%2A前1%29返回false；如果%28%21%28%2A头1<%2A前2%29%29++first 2；}返回true；}
第二版
模板<class InputIt 1，类InputIt 2>bool包括%28InputIt1first 1、InputIt1last1、InputIt2first 2、InputIt2last2，比较comp%29{表示%28；First 2%21=Last2；+++First 1%29{if%28first 1=1COMP%28%2A第二，%2A前1%29%29返回false；if%28%21 comp%28%2A首先，%2A前2%29%29++first 2；}返回true；}
例
二次
#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';
}二次
产出：
二次
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二次
另见
set_difference | computes the difference between two sets (function template) |
|---|---|
search | searches for a range of elements (function template) |
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