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。
句法:
unordered_multimap_name.max_size()
参数:该函数不接受任何参数。
返回值: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。
下面的程序说明了上述函数:
程序1:
// C++ program to illustrate the
// unordered_multimap::max_size()
#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 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}
程式2:
// C++ program to illustrate the
// unordered_multimap::max_size()
#include
using namespace std;
int main()
{
// declaration
unordered_multimap 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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