Section
std::basic_ofstream
The class template basic_ofstream implements high-level output operations on file based streams. It interfaces a file-based streambuffer (std::basic_filebuf) with the high-level interface of (std::basic_ostream).
# Declarations
template<
class CharT,
class Traits = std::char_traits<CharT>
> class basic_ofstream : public std::basic_ostream<CharT, Traits>
# Notes
Feature-test macro Value Std Feature __cpp_lib_fstream_native_handle 202306L (C++26) native handles support
# Example
#include <fstream>
#include <iostream>
#include <string>
int main()
{
std::string filename = "Test.b";
{
std::ofstream ostrm(filename, std::ios::binary);
double d = 3.14;
ostrm.write(reinterpret_cast<char*>(&d), sizeof d); // binary output
ostrm << 123 << "abc" << '\n'; // text output
}
// read back
std::ifstream istrm(filename, std::ios::binary);
double d;
istrm.read(reinterpret_cast<char*>(&d), sizeof d);
int n;
std::string s;
istrm >> n >> s;
std::cout << " read back: " << d << ' ' << n << ' ' << s << '\n';
}