cpp execute command

1//----------------------------------
2//  CREDIT: gregpaton08 on stack overflow
3//  https://stackoverflow.com/questions/478898/how-do-i-execute-a-command-and-get-the-output-of-the-command-within-c-using-po
4//----------------------------------
5#include <cstdio>
6#include <iostream>
7#include <memory>
8#include <stdexcept>
9#include <string>
10#include <array>
11
12std::string exec(const char* cmd) {
13    std::array<char, 128> buffer;
14    std::string result;
15    std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);
16    if (!pipe) {
17        throw std::runtime_error("popen() failed!");
18    }
19    while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
20        result += buffer.data();
21    }
22    return result;
23}
24