operator<<(std::filesystem::directory_entry)

 

C++

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标准库头文件

命名要求

功能测试宏 (C++20)

语言支持库

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元编程库 (C++11)

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输入/输出库

文件系统库 (C++17)

正则表达式库 (C++11)

并发支持库 (C++11)

执行支持库 (C++26)

技术规范

符号索引

外部库

 

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

观察者

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<=> (直到 C++20)(直到 C++20)(直到 C++20)(直到 C++20)(直到 C++20)(C++20)

非成员函数

operator<<

 

template< class CharT, class Traits > friend std::basic_ostream<CharT,Traits>&     operator<<( std::basic_ostream<CharT,Traits>& os, const directory_entry& d );		(自 C++17)

在目录条目 d 上执行流输出。等效于 return os << d.path();.

此函数模板对普通的 无限定 或 限定查找不可见，并且只能通过 参数相关查找在 std::filesystem::directory_entry 是参数关联类的情况下找到。这在存在 using namespace std::filesystem; using 指令 时，可以防止出现不必要的转换。

参数

os	-	要执行输出的流
d	-	要插入的 directory_entry

返回值

os

异常

可能抛出实现定义的异常。

示例

运行此代码

#include <filesystem>
#include <iostream>
namespace fs = std::filesystem;
 
int main()
{
    const auto entries = {fs::directory_entry{fs::current_path()},
                          fs::directory_entry{fs::temp_directory_path()}};
 
    for (const fs::directory_entry& de : entries)
        std::cout << de << '\n';
}

可能输出

"/home/猫"
"/tmp"

另请参阅

operator<<operator>> (C++17)

对带引号的路径执行流输入和输出 (函数)