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    <h3>Boost v1.48 and above</h3> <p>You can use <code>boost::filesystem::canonical</code>:</p> <pre><code>path canonical(const path&amp; p, const path&amp; base = current_path()); path canonical(const path&amp; p, system::error_code&amp; ec); path canonical(const path&amp; p, const path&amp; base, system::error_code&amp; ec); </code></pre> <p><a href="http://www.boost.org/doc/libs/1_48_0/libs/filesystem/v3/doc/reference.html#canonical" rel="noreferrer">http://www.boost.org/doc/libs/1_48_0/libs/filesystem/v3/doc/reference.html#canonical</a></p> <p>v1.48 and above also provide the <code>boost::filesystem::read_symlink</code> function for resolving symbolic links.</p> <h3>Boost versions prior to v1.48</h3> <p>As mentioned in other answers, you can't normalise because boost::filesystem can't follow symbolic links. However, you can write a function that normalises "as much as possible" (assuming "." and ".." are treated normally) because boost offers the ability to determine whether or not a file is a symbolic link.</p> <p>That is to say, if the parent of the ".." is a symbolic link then you have to retain it, otherwise it is probably safe to drop it and it's probably always safe to remove ".".</p> <p>It's similar to manipulating the actual string, but slightly more elegant.</p> <pre><code>boost::filesystem::path resolve( const boost::filesystem::path&amp; p, const boost::filesystem::path&amp; base = boost::filesystem::current_path()) { boost::filesystem::path abs_p = boost::filesystem::absolute(p,base); boost::filesystem::path result; for(boost::filesystem::path::iterator it=abs_p.begin(); it!=abs_p.end(); ++it) { if(*it == "..") { // /a/b/.. is not necessarily /a if b is a symbolic link if(boost::filesystem::is_symlink(result) ) result /= *it; // /a/b/../.. is not /a/b/.. under most circumstances // We can end up with ..s in our result because of symbolic links else if(result.filename() == "..") result /= *it; // Otherwise it should be safe to resolve the parent else result = result.parent_path(); } else if(*it == ".") { // Ignore } else { // Just cat other path entries result /= *it; } } return result; } </code></pre>
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