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std::array
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std::multimap::find

STD：：Multimap：：查找

iterator find( const Key& key (1)​
const_iterator find( const Key& key ) const;(2)​
template< class K > iterator find( const K& x (3)(since C++14)
template< class K > const_iterator find( const K& x ) const;(4)(since C++14)

1，2%29找到一个密钥相当于key如果有几个元素key在容器中，任何一个都可以返回。

3，4%29找到一个键比较的元素等价物价值x。此重载仅在下列情况下才参与重载解析：Compare::is_transparent是有效的，并表示类型。它允许调用此函数，而无需构造Key

参数

key-key value of the element to search for
x-a value of any type that can be transparently compared with a key

返回值

元素的迭代器，该元素的密钥等价于key如果没有找到这样的元素，请参阅end()返回%29迭代器。

复杂性

容器大小的对数。

例

二次

#include <iostream>
#include <map>
 
int main()
{  
    std::multimap<int,char> example = {{1,'a'},{2,'b'}};
 
    auto search = example.find(2
    if(search != example.end()) {
        std::cout << "Found " << search->first << " " << search->second << '\n';
    }
    else {
        std::cout << "Not found\n";
    }
}

二次

产出：

二次

Found 2 b

二次

另见

countreturns the number of elements matching specific key (public member function)
equal_rangereturns range of elements matching a specific key (public member function)

 © cppreference.com

在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/容器/Multimap/find

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