1)等价于status_known(s)&&s.type()!=file_type::not_found. 2)令s分别为如同以status(p)或status(p, ec)(跟随符号链接)确定的std::filesystem::file_status。返回exists(s)。若status_known(s)则不抛出重载调用ec.clear()。 参数 s-要检验的文件状态 ...
Defined in header<filesystem> boolexists(std::filesystem::file_status s)noexcept; (1)(since C++17) boolexists(conststd::filesystem::path&p);boolexists(conststd::filesystem::path&p,std::error_code&ec)noexcept; (2)(since C++17)
std::filesystem::exists Defined in header<filesystem> boolexists(std::filesystem::file_statuss)noexcept; (1)(since C++17) boolexists(conststd::filesystem::path&p); boolexists(conststd::filesystem::path&p,std::error_code&ec)noexcept; ...
1)std::filesystem::exists(status())。 2)std::filesystem::exists(status(ec))。 注意,status()将跟随符号链接到其目标。 参数 返回值 若被指代文件系统对象存在则为true。 异常 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。
#include <iostream> #include <fstream> #include <cstdint> #include <experimental/filesystem> namespace fs = std::experimental::filesystem; void demo_exists(const fs::path& p, fs::file_status s = fs::file_status{}) { std::cout << p; if(fs::status_known(s) ? fs::exists(s) :...
#include <cstdint>#include <filesystem>#include <fstream>#include <iostream>namespacefs=std::filesystem;voiddemo_exists(constfs::path&p, fs::file_statuss=fs::file_status{}){std::cout<<p;if(fs::status_known(s)?fs::exists(s):fs::exists(p))std::cout<<" exists\n";elsestd::cout...
1)等价于status_known(s)&&s.type()!=file_type::not_found。 2)等价于exists(status(p))或exists(status(p, ec))(跟随符号链接)。当发生错误时无抛出重载返回false。 参数 s-要检查的文件状态 p-要检查的路径 ec-用于不抛出重载中报告错误的输出形参 ...
Filesystem library Defined in header<experimental/filesystem> boolexists(file_status s) (1)(filesystem TS) boolexists(constpath&p); boolexists(constpath&p, error_code&ec) (2)(filesystem TS) Checks if the given file status or path corresponds to an existing file or directory. ...
今天用svn命令行提交版本的时候，碰到了这个比较麻烦的问题 svn: File already exists: filesystem '...
As user without permission to create x:\foo\bar, call std::filesystem:create_directories(“x:\foo\bar”, error_code); Expect: no error since the directory exists Actual: error code 5 (E_ACCESSDENIED). I’m on the 15.9 compiler, but a quick glance at 16.5 suggests the same...