Namespaces
Variants

    std::experimental::filesystem::space

    From cppreference.com
     
    C++
     
    Experimental
    Technical Specification
    Filesystem library (filesystem TS)
    Library fundamentals (library fundamentals TS)
    Library fundamentals 2 (library fundamentals TS v2)
    Library fundamentals 3 (library fundamentals TS v3)
    Extensions for parallelism (parallelism TS)
    Extensions for parallelism 2 (parallelism TS v2)
    Extensions for concurrency (concurrency TS)
    Extensions for concurrency 2 (concurrency TS v2)
    Concepts (concepts TS)
    Ranges (ranges TS)
    Reflection (reflection TS)
    Mathematical special functions (special functions TR)
    Experimental Non-TS
    Pattern Matching
    Linear Algebra
    std::execution
    Contracts
    2D Graphics
     
    Filesystem library
    Classes
    Functions
    File types
     
    Defined in header <experimental/filesystem> 
    space_info space( const path& p );
space_info space( const path& p, error_code& ec ) noexcept;
    		(filesystem TS)

    Determines the information about the filesystem on which the pathname p is located, as if by POSIX statvfs.

    Populates and returns an object of type space_info, set from the members of the POSIX struct statvfs as follows:

    • space_info.capacity is set as if by f_blocks * f_frsize.
    • space_info.free is set to f_bfree * f_frsize.
    • space_info.available is set to f_bavail * f_frsize.
    • Any member that could not be determined is set to static_cast<std::uintmax_t>(-1).

    The non-throwing overload sets all members to static_cast<std::uintmax_t>(-1) on error.

    Parameters

    p - path to examine
    ec - out-parameter for error reporting in the non-throwing overload

    Return value

    The filesystem information (a space_info object).

    Exceptions

    The overload that does not take an error_code& parameter throws filesystem_error on underlying OS API errors, constructed with p as the first argument and the OS error code as the error code argument. std::bad_alloc may be thrown if memory allocation fails. The overload taking an error_code& parameter sets it to the OS API error code if an OS API call fails, and executes ec.clear() if no errors occur. This overload has

    noexcept specification:  
    noexcept
      

    Notes

    space_info.available may be less than space_info.free.

    Example

    Run this code
    #include <experimental/filesystem>
#include <iostream>
namespace fs = std::experimental::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

    		 information about free and available space on the filesystem
    (class) [edit]