std::filesystem::space_info (3) Linux Manual Page

std::filesystem::space_info – std::filesystem::space_info

Synopsis

Defined in header<filesystem>

    struct space_info {

    std::uintmax_t capacity;

    std::uintmax_t free;
    (since C++ 17)

        std::uintmax_t available;
};

Represents the filesystem information as determined by space
The members have the following meaning:
* capacity — total size of the filesystem, in bytes
* free — free space on the filesystem, in bytes
* available — free space available to a non-privileged process (may be equal or less than free)

Example

// Run this code

#include <iostream>

#include <filesystem>

namespace fs = std::filesystem;

int main()

{
    fs::space_info devi = fs::space("/dev/null");
    fs::space_info tmpi = fs::space("/tmp");
    std::cout << ".        Capacity       Free      Available\n"
              << "/dev:   " << devi.capacity << "   "
              << devi.free << "   " << devi.available << '\n'
              << "/tmp: " << tmpi.capacity << " "
              << tmpi.free << " " << tmpi.available << '\n';
}

Possible output:

  . Capacity Free Available
  /dev: 4175114240 4175110144 4175110144
  /tmp: 420651237376 411962273792 390570749952

See also

space determines available free space on the file system
        (function)
(C++17)