Here’s the actual code that I used.
inline string trim_right (const string & s)
{
size_t found;
string whitespaces (" \t\n\r");

string str (s);
found=str.find_last_not_of(whitespaces);
if (found!=string::npos){
str.erase(found+1);
}
else{
str.clear();
}
return str;
}

here’s a sample function call

string str1="lorem ipsum dolor ";
string str2=" ";
str2=trim_right(str1);
cout << "->|" << str2.c_str() << "|<-";


Here's the shorter version of the code.

str=str.find_last_not_of(" \t\n\r");


Actually, there could be a ton of other implementation but that's what I'm using. If you know a better way, let me know.

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