31 Input/output library [input.output]

31.12 File systems [filesystems]

31.12.13 Filesystem operation functions [fs.op.funcs]

31.12.13.30 Relative [fs.op.relative]

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path filesystem::relative(const path& p, error_code& ec);
1
#
Returns: relative(p, current_path(), ec).
2
#
Throws: As specified in [fs.err.report].
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path filesystem::relative(const path& p, const path& base = current_path()); path filesystem::relative(const path& p, const path& base, error_code& ec);
3
#
Returns: For the first form: weakly_canonical(p).lexically_relative(weakly_canonical(base));
For the second form: weakly_canonical(p, ec).lexically_relative(weakly_canonical(base, ec)); or path() at the first error occurrence, if any.
4
#
Throws: As specified in [fs.err.report].