C++ unordered_multimap max_size()用法及代码示例

unordered_multimap::max_size()是C++ STL中的内置函数，该函数返回unordered_multimap容器可以容纳的最大元素数。

用法:

unordered_multimap_name.max_size()

参数：该函数不接受任何参数。

返回值：它返回一个整数值，该整数值表示容器可以容纳的元素的最大大小。

以下示例程序旨在说明上述函数：

示例1:

// C++ program to illustrate the 
// unordered_multimap::max_size() 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
  
    // declaration 
    unordered_multimap<int, int> sample1; 
  
    // inserts key and element 
    // in sample1 
    sample1.insert({ 10, 100 }); 
    sample1.insert({ 50, 500 }); 
  
    cout << "The max number of elements that sample1 can hold: "
         << sample1.size(); 
  
    cout << "\nKey and Elements of Sample1 are:"; 
    for (auto it = sample1.begin(); it != sample1.end(); it++) { 
        cout << "{" << it->first << ", " << it->second << "} "; 
    } 
  
    return 0; 
}

输出：

The max number of elements that sample1 can hold: 2
Key and Elements of Sample1 are:{50, 500} {10, 100}

示例2:

// C++ program to illustrate the 
// unordered_multimap::max_size() 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
  
    // declaration 
    unordered_multimap<char, char> sample1, sample2; 
  
    // inserts key and element 
    // in sample1 
    sample1.insert({ 'a', 'A' }); 
    sample1.insert({ 'g', 'G' }); 
  
    cout << "The max number of elements that sample1 can hold: "
         << sample1.size(); 
  
    cout << "\nKey and Elements of Sample1 are:"; 
    for (auto it = sample1.begin(); it != sample1.end(); it++) { 
        cout << "{" << it->first << ", " << it->second << "} "; 
    } 
  
    return 0; 
}

输出：

The max number of elements that sample1 can hold: 2
Key and Elements of Sample1 are:{g, G} {a, A}

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注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 unordered_multimap max_size() function in C++ STL。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。