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Showing content from https://en.cppreference.com/w/cpp/algorithm/../utility/../io/../filesystem/temp_directory_path.html below:

std::filesystem::temp_directory_path - cppreference.com

path temp_directory_path();

(1) (since C++17) (2) (since C++17)

Returns the directory location suitable for temporary files.

[edit] Parameters

(none)

[edit] Return value

A directory suitable for temporary files. The path is guaranteed to exist and to be a directory. The overload that takes error_code& argument returns an empty path on error.

[edit] 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

path to be returned

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.

[edit] Notes

On POSIX systems, the path may be the one specified in the environment variables TMPDIR, TMP, TEMP, TEMPDIR, and, if none of them are specified, the path "/tmp" is returned.

On Windows systems, the path is typically the one returned by GetTempPath.

[edit] Example

#include <filesystem>
#include <iostream>
namespace fs = std::filesystem;
 
int main()
{
    std::cout << "Temp directory is " << fs::temp_directory_path() << '\n';
}

Possible output:

Temp directory is "C:\Windows\TEMP\"

[edit] See also creates and opens a temporary, auto-removing file
(function) [edit] returns or sets the current working directory
(function) [edit]

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