std::filesystem::directory_entry::assign
來自 cppreference.com
< cpp | filesystem | directory_entry
| void assign( const std::filesystem::path& p ); |
(1) | (C++17 起) |
| void assign( const std::filesystem::path& p, std::error_code& ec ); |
(2) | (C++17 起) |
將新內容分配給目錄項物件。將路徑設定為 p 並呼叫 refresh 以更新快取屬性。如果發生錯誤，快取屬性的值未指定。
此函式不會對檔案系統提交任何更改。
目錄 |
[編輯] 引數
| p | - | 目錄項將引用的檔案系統物件的路徑 |
| ec | - | 非丟擲過載中用於錯誤報告的出參 |
[編輯] 返回值
(無)
[編輯] 異常
任何未標記為 noexcept 的過載都可能在記憶體分配失敗時丟擲 std::bad_alloc。
[編輯] 示例
執行此程式碼
#include <filesystem> #include <fstream> #include <iostream> void print_entry_info(const std::filesystem::directory_entry& entry) { if (std::cout << "The entry " << entry; not entry.exists()) { std::cout << " does not exists on the file system\n"; return; } std::cout << " is "; if (entry.is_directory()) std::cout << "a directory\n"; if (entry.is_regular_file()) std::cout << "a regular file\n"; /*...*/ } int main() { std::filesystem::current_path(std::filesystem::temp_directory_path()); std::filesystem::directory_entry entry{std::filesystem::current_path()}; print_entry_info(entry); std::filesystem::path name{"cppreference.html"}; std::ofstream{name} << "C++"; std::cout << "entry.assign();\n"; entry.assign(entry/name); print_entry_info(entry); std::cout << "remove(entry);\n"; std::filesystem::remove(entry); print_entry_info(entry); // the entry still contains old "state" std::cout << "entry.assign();\n"; entry.assign(entry); // or just call entry.refresh() print_entry_info(entry); }
可能的輸出
The entry "/tmp" is a directory entry.assign(); The entry "/tmp/cppreference.html" is a regular file remove(entry); The entry "/tmp/cppreference.html" is a regular file entry.assign(); The entry "/tmp/cppreference.html" does not exists on the file system
[編輯] 參閱
| 賦值內容 (public member function) |
