c++ std::filesystem discussion, std::filesystem was added to the ISO C++ standard library in C++17
Specification available from http://en.cppreference.com/w/cpp/filesystem
Questions tagged [std-filesystem]
165 questions
2
votes
2 answers
Potential bug in std::filesystem::remove_all with clang++
DO NOT TRY THIS AT HOME
I am having a weird issue with std::filesystem::remove_all.
I have written a program that writes N files to disk in a single directory and then deletes all the files afterward (there is a good reason for this).
However, when…
Lars Nielsen
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2
votes
1 answer
Non-empty relative current path, in standard C++?
With C++17 (or Boost::filesystem), we can get the current path / current working directory using filesystem::current_path(). However - that gives us an absolute path.
We could also use an empty path as the relative current path - sometimes.
But - is…
einpoklum
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2
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0 answers
Is it possible to refactor _wfopen to std::filesystem?
I want to refactor this code in C++17. Can I use std::filesystem in this case?
#if defined(BOOSTER_WIN_NATIVE)
bool open(std::string const &file_name,std::string const &encoding)
{
close();
//
// Under Windows, we have to use…
Sergey Inozemcev
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- 10
2
votes
1 answer
How to detect usability on OSX?
I wanted to do some cross-platform, optional usage of std::filesystem and used code like the below:
#ifdef __has_include
#if __has_include()
#include
#endif
#endif
#ifdef __cpp_lib_filesystem
#include
// Use of…
Flamefire
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2
votes
1 answer
Is lexically_normal() redundant on a call to std::filesystem::canonical() or std::filesystem::weakly_canonical()?
Would there be a reason to call lexically_normal in either of these cases:
std::filesystem::path filepath = someFuntionThatGetsAPath();
filepath = std::filesystem::canonical (filepath).lexically_normal ();
filepath =…
michig54
- 21
- 2
2
votes
0 answers
Searching a file using std::filesystem and multithreading
I wrote a program to search a file by name on system using std::filesystem (recursive search using std::filesystem::recursive_directory_iterator). It works properly if I use only one main thread, execution time ~1 second, if I start from root ("/")…
MichaelPhoenix
- 19
- 3
2
votes
1 answer
Strange operator/ of std::filesystem::path
auto path = std::filesystem::path("c:") / "PosteClient.log";
results in c:PosteClient.log instead of c:\PosteClient.log
This is a strange behavior for me as the result on windows can't be used e.g.
CreateFile("c:PosteClient.log")
fails with…
usurpbrain
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- 2
2
votes
1 answer
why does std::filesystem::path::root_name() return empty string?
I have below sample code which I ran on visual studio 2019 and on https://godbolt.org/. I can see that there are two different behavior. What could be the possible reason ?
#include
#include
int main()
{
…
Praveer Kumar
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2
votes
1 answer
Why is std::filesystem::file_size on directories left to the implementaiton?
So I have the following problem: I need to summarise the byte size of all files in a specific directory, this includes the size of the sub-directories, as in my case they actually can increase in size.
But if we run this code on a directory that…
Lars Nielsen
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2
votes
0 answers
Is it correct that std::filesystem::operator==() returns false when comparing two unc paths with different path separators?
I just fell over the following behavior of std::filesystem::path compiling with Visual Studio 16.0.0 and I wonder if it is correct.
#include
int main()
{
std::filesystem::path absPath1("c:\\foo\\bar");
std::filesystem::path…
Knitschi
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2
votes
1 answer
CMake idiom for overcoming libstdc++ filesystem weirdness?
If you build C++14 code with G++ and libstdc++, there's a library named libstdc++fs, which is separate from the rest of libstdc++, and contains the code for std::experimental::filesystem. If you don't link against it, you'll get undefined…
einpoklum
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2
votes
1 answer
Does CPP provide a way to figure out which of the filesystem perms apply?
(This is intended as a specific query regarding the newer standards like C++17)
the filesystem headers now provide a way to get the permissions on a path, formatted in the standard 3 perms way (owner, group, other).
How would one determine which of…
KotoroShinoto
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2
votes
1 answer
Which versions of GCC and clang support std::filesystem/std::experimental::filesystem?
I'm using GCC 7.4.0 and clang 6.0.0 and they both seem to have an implementation of filesystem in .
since the project that i'm working on requires std::filesystem, i want to know which versions (Major + Minor) of them…
user10777785
2
votes
1 answer
What does *--end() mean in C++?
Looking at this cppreference.com page for std::filesystem::path::filename, the method's description is literaly just "equivalent to relative_path().empty() ? path() : *--end()". I've never seen that syntax "*--end()". I can figure out what it does…
Matheus Leão
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2
votes
1 answer
c++ - double free when using std::filesystem::path in a vector
I'm working on a bare-bones file browser using DearImgui. For this i'm using std::filesystem with g++-9 and am currently testing on Kubuntu 19.04. For the most part the program works as expected. A button is used to descend into the parent directory…
Miami
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