STL::map默认会按照.first的字母顺序排列

// map默认会按照.first的字母顺序排列

#include <map>
#include <string>
#include <iostream>

using namespace std;

int main()
{
map<string, string> map1;
map<string, string>::iterator mapit;
map<string, string>::iterator saveit;

map1["fab"] = "2";
map1["dja"] = "3";
map1["dfe"] = "4";
map1["tw"] = "5";

cout << "Map size: " << map1.size() << endl;

mapit = map1.begin();
while (mapit != map1.end())
{
cout << "Element key: " << mapit->first << ", value: " << mapit->second << endl;
mapit++;
}

return 0;
}

Map size: 4
Element key: dfe, value: 4
Element key: dja, value: 3
Element key: fab, value: 2
Element key: tw, value: 5
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