| Technical Specification | ||||
| Filesystem library(filesystem TS) | ||||
| Library fundamentals(library fundamentals TS) | ||||
| Library fundamentals 2(library fundamentals TS v2) | ||||
| Library fundamentals 3(library fundamentals TS v3) | ||||
| Extensions for parallelism(parallelism TS) | ||||
| Extensions for parallelism 2(parallelism TS v2) | ||||
| Extensions for concurrency(concurrency TS) | ||||
| Extensions for concurrency 2(concurrency TS v2) | ||||
| Concepts(concepts TS) | ||||
| Ranges(ranges TS) | ||||
| Reflection(reflection TS) | ||||
| Mathematical special functions(special functions TR) | ||||
| Experimental Non-TS | ||||
| Pattern Matching | ||||
| Linear Algebra | ||||
| std::execution | ||||
| Contracts | ||||
| 2D Graphics |
| Classes | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Functions | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| File types | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Defined in header <experimental/filesystem> | ||
void create_hard_link(const path& target,const path& link); void create_hard_link(const path& target,const path& link, error_code& ec); | (filesystem TS) | |
Creates a hard linklink with its target set totarget as if by POSIXlink(): the pathnametarget must exist.
Once created,link andtarget are two logical names that refer to the same file (they areequivalent). Even if the original nametarget is deleted, the file continues to exist and is accessible aslink.
Contents |
| target | - | path of the file or directory to link to |
| link | - | path of the new hard link |
| ec | - | out-parameter for error reporting in the non-throwing overload |
(none)
Some operating systems do not support hard links at all or support them only for regular files.
Some file systems do not support hard links regardless of the operating system: the FAT file system used on memory cards and flash drives, for example.
Some file systems limit the number of links per file.
Hardlinking to directories is typically restricted to the superuser.
Hard links typically cannot cross filesystem boundaries.
The special pathname dot (".") is a hard link to its parent directory. The special pathname dot-dot".." is a hard link to the directory that is the parent of its parent.
#include <experimental/filesystem>#include <fstream>#include <iostream>namespace fs= std::experimental::filesystem; int main(){ fs::create_directories("sandbox/subdir");std::ofstream("sandbox/a").put('a');// create regular file fs::create_hard_link("sandbox/a","sandbox/b"); fs::remove("sandbox/a");// read from the original file via surviving hard linkchar c=std::ifstream("sandbox/b").get();std::cout<< c<<'\n'; fs::remove_all("sandbox");}
Output:
a
| creates a symbolic link (function)[edit] | |
| returns the number of hard links referring to the specific file (function)[edit] |
