The question Convert absolute filesystem path to a file URI in a platform-agnostic way
is six years old and now we have boost url https://www.boost.org/doc/libs/1_85_0/libs/url/doc/html/index.html.

Is it possible to convert the abs path with boost url?
I tried for example this:

boost::url u;
u.set_scheme( "file" );
u.set_path( "c:/path/to/file.txt" );
cout << u << "n";

The result is:

file:c:/path/to/file.txt

But it should be:

file:///c%3A%2Fpath%2Fto%2Ffile.txt

You can test it with https://www.urlencoder.org/

Thanks,
Thomas