std::experimental::filesystem::space
From cppreference.com
< cpp | experimental | fs
Defined in header <experimental/filesystem>
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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 byf_blocks*f_frsize
-
space_info.free
is set tof_bfree*f_frsize
-
space_info.available
is set tof_bavail*f_frsize
- Any member that could not be determined is set to static_cast<uintmax_t>(-1)
The non-throwing overload sets all members to static_cast<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 aerror_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 a 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 <iostream> #include <experimental/filesystem> 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) |