std::filesystem::directory_entry::is_block_file

 

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技术规范

 

文件系统库

类
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
函数
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
文件类型
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

 

std::filesystem::directory_entry

成员函数

directory_entry::directory_entry

修改器

directory_entry::operator=

directory_entry::assign

directory_entry::replace_filename

directory_entry::refresh

观察器

directory_entry::pathdirectory_entry::operator const path&

directory_entry::exists

directory_entry::is_block_file

directory_entry::is_character_file

directory_entry::is_directory

directory_entry::is_fifo

directory_entry::is_other

directory_entry::is_regular_file

directory_entry::is_socket

directory_entry::is_symlink

directory_entry::file_size

directory_entry::hard_link_count

directory_entry::last_write_time

directory_entry::statusdirectory_entry::symlink_status

directory_entry::operator==directory_entry::operator!=directory_entry::operator<directory_entry::operator>directory_entry::operator<=directory_entry::operator>=directory_entry::operator<=> (C++20 前)(C++20 前)(C++20 前)(C++20 前)(C++20 前)(C++20)

非成员函数

operator<<

 

bool is_block_file() const; bool is_block_file( std::error_code& ec ) const noexcept;		(C++17 起)

检查所指向对象是否阻塞设备。各自等效于返回 std::filesystem::is_block_file(status()) 或 std::filesystem::is_block_file(status(ec))

参数

ec

-

不抛出重载中报告错误的输出参数

返回值

若所指代文件系统对象是阻塞设备则为 true ，否则为 false 。

异常

不接受 std::error_code& 参数的重载在底层 OS API 错误时抛出 filesystem_error ，以第一 path 参数 p 和作为错误码参数的 OS 错误码构造。若 OS API 调用失败，则接受 std::error_code& 参数的重载设置该参数为 OS API 错误码，而若不出现错误则执行 ec.clear() 。若内存分配失败，则任何不标记为 noexcept 的重载可能抛出 std::bad_alloc 。

参阅

is_block_file (C++17)

检查给定的路径是否表示块设备 (函数)