std::filesystem::space_info

 

C++

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Feature test macros (C++20)

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Filesystem library (C++17)

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Technical specifications

Symbols index

External libraries

 

Filesystem library

Classes
filesystem::path filesystem::filesystem_error filesystem::directory_entry filesystem::directory_iterator filesystem::recursive_directory_iterator      filesystem::file_status	filesystem::space_info filesystem::file_type filesystem::perms filesystem::perm_options filesystem::copy_options filesystem::directory_options filesystem::file_time_type
Functions
filesystem::absolute filesystem::canonicalfilesystem::weakly_canonical filesystem::relativefilesystem::proximate filesystem::copy filesystem::copy_file filesystem::copy_symlink filesystem::create_directory filesystem::create_directories filesystem::create_hard_link filesystem::create_symlink filesystem::create_directory_symlink filesystem::current_path	filesystem::exists filesystem::equivalent filesystem::file_size filesystem::hard_link_count filesystem::last_write_time filesystem::permissions filesystem::read_symlink filesystem::remove filesystem::remove_all filesystem::rename filesystem::resize_file filesystem::space filesystem::status filesystem::symlink_status filesystem::temp_directory_path
File types
filesystem::is_block_file filesystem::is_character_file filesystem::is_directory filesystem::is_empty filesystem::status_known	filesystem::is_fifo filesystem::is_other filesystem::is_regular_file filesystem::is_socket filesystem::is_symlink

 

Defined in header <filesystem>
struct space_info {     std::uintmax_t capacity;     std::uintmax_t free;     std::uintmax_t available; };		(since C++17)

Represents the filesystem information as determined by filesystem::space.

Member objects

capacity	total size of the filesystem, in bytes (public member object)
free	free space on the filesystem, in bytes (public member object)
available	free space available to a non-privileged process (may be equal or less than free) (public member object)

Non-member functions

operator== (C++20)

compares two space_infos (function)

operator==(std::filesystem::space_info)

friend bool operator==( const space_info&, const space_info& ) = default;		(since C++20)

Checks if capacity, free and available of both arguments are equal respectively.

This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::filesystem::space_info is an associated class of the arguments.

The != operator is synthesized from operator==.

Example

Run this code

#include <iostream>
#include <filesystem>
#include <cstdint>
 
void print_space_info(auto const& dirs, int width = 14)
{
    std::cout << std::left;
    for (const auto s : {"Capacity", "Free", "Available", "Dir"})
        std::cout << "│ " << std::setw(width) << s << ' ';
    std::cout << '\n';
    std::error_code ec;
    for (auto const& dir : dirs) {
        const std::filesystem::space_info si = std::filesystem::space(dir, ec);
        std::cout
            << "│ " << std::setw(width) << static_cast<std::intmax_t>(si.capacity) << ' '
            << "│ " << std::setw(width) << static_cast<std::intmax_t>(si.free) << ' '
            << "│ " << std::setw(width) << static_cast<std::intmax_t>(si.available) << ' '
            << "│ " << dir << '\n';
    }
}
 
int main()
{
    const auto dirs = { "/dev/null", "/tmp", "/home", "/null" };
    print_space_info(dirs);
}

Possible output:

│ Capacity       │ Free           │ Available      │ Dir
│ 8342851584     │ 8342851584     │ 8342851584     │ /dev/null
│ 12884901888    │ 3045265408     │ 3045265408     │ /tmp
│ 250321567744   │ 37623181312    │ 25152159744    │ /home
│ -1             │ -1             │ -1             │ /null

See also

space (C++17)

determines available free space on the file system (function)