function template
<unordered_set>
std::operators (unordered_multiset)
| 相等 (1) | template <class Key, class Hash, class Pred, class Alloc> bool operator== ( const unordered_multiset<Key,Hash,Pred,Alloc>& lhs, const unordered_multiset<Key,Hash,Pred,Alloc>& rhs ); |
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| 不等 (2) | template <class Key, class Hash, class Pred, class Alloc> bool operator!= ( const unordered_multiset<Key,Hash,Pred,Alloc>& lhs, const unordered_multiset<Key,Hash,Pred,Alloc>& rhs ); |
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Relational operators for unordered_multiset
These overloaded global operator functions perform the appropriate equality or inequality comparison operation between the unordered_multiset containers lhs and rhs.
相等比较的过程如下（如果在过程中找到确定的答案，则停止）：
参数
- lhs, rhs
- unordered_multiset containers (to the left- and right-hand side of the operator, respectively), having both the same template parameters (键, Hash, Pred和Alloc).
返回值
true如果条件成立，则为 true，并且false否则为 false。
示例
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// unordered_multiset comparisons
#include <iostream>
#include <string>
#include <unordered_set>
int main ()
{
std::unordered_multiset<std::string>
a = {"AAPL","MSFT","GOOG"},
b = {"MSFT","GOOG","AAPL"},
c = {"MSFT","GOOG","AAPL","AAPL"};
if (a==b) std::cout << "a and b are equal\n";
if (b!=c) std::cout << "b and c are not equal\n";
return 0;
}
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输出
a and b are equal
b and c are not equal
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复杂度
Average case: linear in size.
Worst case: quadratic in size.