std::filesystem::space_info
From cppreference.com
< cpp | filesystem
Defined in header <filesystem>
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struct space_info { std::uintmax_t capacity; |
(since C++17) | |
Represents the filesystem information as determined by filesystem::space
.
Contents |
[edit] 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) |
[edit] Non-member functions
operator== (C++20) |
compares two space_info s (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==
.
[edit] Example
Run this code
#include <cstdint> #include <filesystem> #include <iostream> #include <locale> std::uintmax_t disk_usage_percent(const std::filesystem::space_info& si, bool is_privileged = false) noexcept { if (constexpr std::uintmax_t X(-1); si.capacity == 0 || si.free == 0 || si.available == 0 || si.capacity == X || si.free == X || si.available == X ) return 100; std::uintmax_t unused_space = si.free, capacity = si.capacity; if (!is_privileged) { const std::uintmax_t privileged_only_space = si.free - si.available; unused_space -= privileged_only_space; capacity -= privileged_only_space; } const std::uintmax_t used_space{capacity - unused_space}; return 100 * used_space / capacity; } void print_disk_space_info(auto const& dirs, int width = 14) { (std::cout << std::left).imbue(std::locale("en_US.UTF-8")); for (const auto s : {"Capacity", "Free", "Available", "Use%", "Dir"}) std::cout << "│ " << std::setw(width) << s << ' '; for (std::cout << '\n'; auto const& dir : dirs) { std::error_code ec; const std::filesystem::space_info si =