❤❤❤❤❤❤

代码如下：

#include <iostream>
#include <string>

using namespace std;

string& foo(string& name, const string& pre, const string& tail);
string& foo(string& name, const string& pre, const string& tail, int);

int main()
{
	string name = "蕾宝宝";
	string name2 = name;
	cout << foo(name, "亲爱的", "，爱你！") << endl;
	cout << foo(name2, "亲爱的", "，爱你！", 1) << endl;
	return 0;
}


string& foo(string& name, const string& pre, const string& tail)
{
	name.insert(name.begin(), pre.begin(), pre.end());
	name.append(tail);
	return name;
}

string& foo(string& name, const string& pre, const string& tail, int)
{
	name.insert(0, pre);
	name.insert(name.size(), tail);
	return name;
}