c++ primer 课后练习 9.28

#include
#include
#include
using namespace std;
void opps_func(forward_list & ,string, string);//我们要使用的函数
int main(void)
{
forward_list flist = { "Andrew Wiggins", "Jabari Parker", "Joel Embiid", "Aaron Gerdon", "Dante Exum" };
for (auto ss : flist)
{
cout << ss << endl;
}
cout << "*****************************" << endl;//作为分界线
opps_func(flist,"Jabari Parker","Julius Randle");
for (auto ss : flist)
cout << ss << endl;
cout << "******************************" << endl;
opps_func(flist, "Marcus Smart", "Jordan Clacson");
for (auto ss : flist)
cout << ss << endl;
}
void opps_func(forward_list & flist, string s1, string s2)
{
auto cerr = flist.begin();
int detect = 0;//检测标志位(用惯了单片机，习惯了标志位)
auto prev = flist.before_begin();
while (cerr != flist.end())
{
if (*cerr == s1) // 如果有匹配的string
{
flist.insert_after(cerr, s2);
detect = 1;
}
prev = cerr;
++cerr;
}
if (detect==0)//如果没有匹配的strinig
{

flist.insert_after(prev,s2);
}
}