std::filesystem::absolute

Since C++17

Header: <filesystem>

Returns a path referencing the same file system location as p, for which filesystem::path::is_absolute() is true.

# Declarations

path absolute( const std::filesystem::path& p );

(since C++17)

path absolute( const std::filesystem::path& p, std::error_code& ec );

(since C++17)

# Parameters

p: path to convert to absolute form
ec: out-parameter for error reporting in the non-throwing overload

# Return value

Returns an absolute (although not necessarily canonical) pathname referencing the same file as p.

# Notes

Implementations are encouraged to not consider p not existing to be an error.

For POSIX-based operating systems, std::filesystem::absolute(p) is equivalent to std::filesystem::current_path() / p except for when p is the empty path.

For Windows, std::filesystem::absolute may be implemented as a call to GetFullPathNameW.

# Example

#include <filesystem>
#include <iostream>
namespace fs = std::filesystem;
 
int main()
{
    std::filesystem::path p = "foo.c";
    std::cout << "Current path is " << std::filesystem::current_path() << '\n';
    std::cout << "Absolute path for " << p << " is " << fs::absolute(p) << '\n';
}