将FileStream中的数据读入通用流

#include<iostream>
#include <fstream>
#include <sstream>

int main() {
    std::ifstream file("example.txt");
    std::stringstream buffer;

    if (!file.is_open()) {
        std::cerr << "Error: Failed to open file."<< std::endl;
        return 1;
    }

    buffer<< file.rdbuf();
    std::string file_contents = buffer.str();

    std::cout << "File contents: "<< file_contents<< std::endl;

    file.close();
    return 0;
}