std::filesystem::directory_entry:: exists
From cppreference.com
<
cpp
|
filesystem
|
directory entry
|
bool
exists
(
)
const
;
|
(1) | (since C++17) |
|
bool
exists
(
std::
error_code
&
ec
)
const
noexcept
;
|
(2) | (since C++17) |
Checks whether the pointed-to object exists. Effectively returns:
1)
std::
filesystem
::
exists
(
status
(
)
)
,
2)
std::
filesystem
::
exists
(
status
(
ec
)
)
.
Note that
status()
follows symlinks to their targets.
Parameters
| ec | - | out-parameter for error reporting in the non-throwing overload |
Return value
true if the referred-to filesystem object exists.
Exceptions
Any overload not marked
noexcept
may throw
std::bad_alloc
if memory allocation fails.
1)
Throws
std::filesystem::filesystem_error
on underlying OS API errors, constructed with
p
as the first path argument and the OS error code as the error code argument.
2)
Sets a
std::
error_code
&
parameter to the OS API error code if an OS API call fails, and executes
ec.
clear
(
)
if no errors occur.
Example
Run this code
#include <filesystem> #include <iostream> int main() { for (auto const str: { "/usr/bin/cat", "/usr/bin/mouse", "/usr/bin/python", "/usr/bin/bison", "/usr/bin/yacc", "/usr/bin/c++", }) { std::filesystem::directory_entry entry{str}; std::cout << "directory entry " << entry << (entry.exists() ? " exists\n" : " does not exist\n"); } }
Possible output:
// Output on a POSIX system: directory entry "/usr/bin/cat" exist directory entry "/usr/bin/mouse" does not exist directory entry "/usr/bin/python" exists directory entry "/usr/bin/bison" exists directory entry "/usr/bin/yacc" does not exist directory entry "/usr/bin/c++" exists
See also
|
(C++17)
|
checks whether path refers to existing file system object
(function) |