如何打印C ++映射值? [英] How can I print out C++ map values?

问题描述

我有这样的map:

map<string, pair<string,string> > myMap;

然后我使用以下命令将一些数据插入了地图:

And I've inserted some data into my map using:

myMap.insert(make_pair(first_name, make_pair(middle_name, last_name)));

我现在如何打印出地图中的所有数据?

How can I now print out all the data in my map?

推荐答案

for(map<string, pair<string,string> >::const_iterator it = myMap.begin();
    it != myMap.end(); ++it)
{
    std::cout << it->first << " " << it->second.first << " " << it->second.second << "\n";
}

在C ++ 11中，您不需要拼写map<string, pair<string,string> >::const_iterator.您可以使用auto

In C++11, you don't need to spell out map<string, pair<string,string> >::const_iterator. You can use auto

for(auto it = myMap.cbegin(); it != myMap.cend(); ++it)
{
    std::cout << it->first << " " << it->second.first << " " << it->second.second << "\n";
}

请注意cbegin()和cend()函数的使用.

更容易的是，您可以使用基于范围的for循环:

Easier still, you can use the range-based for loop:

for(auto elem : myMap)
{
   std::cout << elem.first << " " << elem.second.first << " " << elem.second.second << "\n";
}

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