Checks whether the pathsp1 andp2 resolve to the same file system entity.

If eitherp1 orp2 does not exist, an error is reported.

The non-throwing overload returnsfalse on errors.

[edit]Parameters

[edit]Return value

true if thep1 andp2 refer to the same file or directory and their file status is the same.false otherwise.

[edit]Exceptions

Any overload not markednoexcept may throwstd::bad_alloc if memory allocation fails.

[edit]Notes

Two paths are considered to resolve to the same file system entity if the two candidate entities the paths resolve to are located on the same device at the same location. For POSIX, this means that thest_dev andst_ino members of their POSIXstat structure, obtained as if by POSIXstat(), are equal.

In particular, all hard links for the same file or directory are equivalent, and a symlink and its target on the same file system are equivalent.

[edit]Example

#include <cstdint>#include <filesystem>#include <iostream>namespace fs= std::filesystem; int main(){// hard link equivalency    fs::path p1=".";    fs::path p2= fs::current_path();if(fs::equivalent(p1, p2))std::cout<< p1<<" is equivalent to "<< p2<<'\n'; // symlink equivalencyfor(const fs::path lib:{"/lib/libc.so.6","/lib/x86_64-linux-gnu/libc.so.6"}){try{            p2= lib.parent_path()/ fs::read_symlink(lib);}catch(std::filesystem::filesystem_errorconst& ex){std::cout<< ex.what()<<'\n';continue;} if(fs::equivalent(lib, p2))std::cout<< lib<<" is equivalent to "<< p2<<'\n';}}

"." is equivalent to "/var/tmp/test"filesystem error: read_symlink: No such file or directory [/lib/libc.so.6]"/lib/x86_64-linux-gnu/libc.so.6" is equivalent to "/lib/x86_64-linux-gnu/libc-2.23.so"

[edit]Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

[edit]See also

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