答案如下

#include "HashMap.h"
#include <algorithm>
#include <iostream>
#include <cassert>
using namespace std;HashMap::HashMap(void)
{reset();cout << "HashMap()" << endl;
}HashMap::~HashMap(void)
{cout << "~HashMap()" << endl;
}HashMap::HashMap(const HashMap& from)
{copy(from);cout << "HashMap(const HashMap &)" << endl;
}HashMap& HashMap::operator=(const HashMap& from)
{copy(from);cout << "HashMap::operator=(const HashMap & from)" << endl;return *this;
}size_t HashMap::size(void) const
{return m_size;
}bool HashMap::contains(const int& key) const
{auto index = hash(key);auto& bucket = m_bucket_array[index];auto itr = std::find_if(bucket.begin(), bucket.end(), [key](const value_type& value) {return value.first =