Read Whole ASCII File into C++ std::string

This is a simple way to read whole ASCII file into std::string in C++ ?

Algorithm

Here is the algorithm we will follow to Read the whole ASCII file into C++ std::string.

Begin  Declare a file a.txt using file object f of ifstream type to perform a read operation.
 Declare a variable str of string type.  If(f) Declare another variable ss of ostringstream type.
Call rdbuf() function to read the data of the file object.
Put the data of file object in ss.
Put the string of ss into the str string.
Print the value of str.
End.

Example

Here is the following example of it.

#include<iostream>
#include<fstream>
#include<sstream>
#include<string>
using namespace std;
int main() {
 ifstream f("a.txt"); //taking file as inputstream
 string str;
 if(f) {
ostringstream ss;
ss << f.rdbuf(); // reading data
str = ss.str();
 }
 cout<<str;
}

Input

a.txt data file containing the text "hi"

Output

hi