How to decompress GZ files on-the-fly in C++ using boost::iostreams

This minimal example shows you how to open a .gz file in C++, decompress it on-the-fly using boost::iostreams and then copy its contents to stdout:

#include <fstream>
#include <iostream>
#include <boost/iostreams/filtering_streambuf.hpp>
#include <boost/iostreams/copy.hpp>
#include <boost/iostreams/filter/gzip.hpp>
using namespace std;

int main(int argc, char** argv) {
    if(argc < 2) {
        cerr << "Usage: " << argv[0] << " <gzipped input file>" << endl;
    //Read from the first command line argument, assume it's gzipped
    ifstream file(argv[1], ios_base::in | ios_base::binary);
    boost::iostreams::filtering_streambuf<boost::iostreams::input> inbuf;
    //Convert streambuf to istream
    istream instream(&inbuf);
    //Copy everything from instream to 
    cout << instream.rdbuf();
cmake_minimum_required(VERSION 3.0)
find_package(Boost 1.36.0 COMPONENTS iostreams)

add_executable(iostreams-gz-decompress iostreams-gz-decompress.cpp)
target_link_libraries(iostreams-gz-decompress ${Boost_LIBRARIES})