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📜  C++ STL中的unordered_multimap max_load_factor()函数

📅  最后修改于: 2021-05-30 14:23:23             🧑  作者: Mango

unordered_multimap :: max_load_factor()是C++ STL中的内置函数,它返回unordered_multimap容器的最大加载因子。此函数还提供设置最大负载系数的选项。

  • 语法(返回最大负载系数):
unordered_multimap_name.max_load_factor()

参数:该函数不接受任何参数。

返回值:它返回一个整数值,该整数值表示容器的最大装载系数。

下面的程序说明了上述函数:

程序1:

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


C++
// C++ program to illustrate the
// unordered_multimap::max_load_factor(N)
#include 
using namespace std;
 
int main()
{
 
    // declaration
    unordered_multimap sample1;
 
    // inserts key and element
    // in sample1
    sample1.insert({ 10, 100 });
    sample1.insert({ 50, 500 });
 
    cout << "The max load factor of elements of sample1: "
         << sample1.max_load_factor();
 
    // sets the load factor
    sample1.max_load_factor(100);
 
    cout << "\nThe max load factor of sample1 after setting it: "
         << sample1.max_load_factor();
 
    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 load factor  of sample1: 1
Key and Elements of Sample1 are:{50, 500} {10, 100}




  • 语法(设置最大负载系数):
unordered_multimap_name.max_load_factor(N)

参数:该函数接受单个强制参数N,该参数指定要设置的负载系数。该N将是容器的最大负载系数。

返回值:该函数不返回任何内容。

下面的程序说明了上述函数:

C++

// C++ program to illustrate the
// unordered_multimap::max_load_factor(N)
#include 
using namespace std;
 
int main()
{
 
    // declaration
    unordered_multimap sample1;
 
    // inserts key and element
    // in sample1
    sample1.insert({ 10, 100 });
    sample1.insert({ 50, 500 });
 
    cout << "The max load factor of elements of sample1: "
         << sample1.max_load_factor();
 
    // sets the load factor
    sample1.max_load_factor(100);
 
    cout << "\nThe max load factor of sample1 after setting it: "
         << sample1.max_load_factor();
 
    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 load factor of elements of sample1: 1
The max load factor of sample1 after setting it: 100
Key and Elements of Sample1 are:{50, 500} {10, 100}




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