Dear boosters, I noticed that currently there's no way to get the relative path of path A related to path B. What I mean is, given two **complete** paths, to get the relative path of one related to the other. To give a real example, I have an application that starts in directory initial_path(). I have several dialogs that allow the user to browse for files. My requirement is, after the user browses for a file, to internally ALWAYS store the path relative to initial_path(). Since there's no way to do this currently, I created my own function. Do you think it could be a useful addition to filesystem library? // converts the given path, making it relative to the src path // // precondition: dest & src are both complete path relative_to( const path & dest, const path & src) { // both paths should be complete assert( dest.is_complete() && src.is_complete() ); path::iterator dest_begin = dest.begin(), dest_end = dest.end(); path::iterator src_begin = src.begin(), src_end = src.end(); path result; #if defined(BOOST_WINDOWS) //#if defined(WIN32) if ( dest.root_name() != src.root_name() ) { // paths are on different drives (like, "c:/test/t.txt" and "d:/home") return dest; } if ( src_begin != src_end) ++src_begin; if ( dest_begin != dest_end) ++dest_begin; #endif // ignore directories that are same while ( (src_begin != src_end) && (dest_begin != dest_end)) { if ( *src_begin != *dest_begin) break; ++src_begin, ++dest_begin; } // now, we begin to relativize while ( src_begin != src_end) { result /= ".."; ++src_begin; } while ( dest_begin != dest_end) { result /= *dest_begin; ++dest_begin; } return result; } void test_relative_to( const std::string & dest, const std::string & src) { std::string result = relative_to( dest, src).string(); std::cout << "Testing path '" << dest << "',\n" " relative to '" << src << "'\n" " result : '" << result << "'\n" << std::endl; } int main(int argc, char* argv[]) { path::default_name_check( &native); test_relative_to( "c:/temp/test/inner/i2/file.txt", "c:/temp/test"); test_relative_to( "c:/temp/test/inner/i2/file.txt", "c:/temp/test/other"); test_relative_to( "c:/temp/test/inner/i2/file.txt", "c:/temp"); test_relative_to( "c:/temp/test/inner/i2/file.txt", "c:/temp/test"); test_relative_to( "c:/temp/test", "c:/temp/test"); test_relative_to( "c:/temp/test/inner/i2/file.txt", "d:/temp/test"); test_relative_to( "c:/temp/test", "d:/temp/test"); test_relative_to( "c:/other/test/inner/i2/file.txt", "c:/temp/test"); test_relative_to( "c:/other/test/inner/i2/file.txt", "c:/oth/test/other"); test_relative_to( "c:/other/test/inner/i2/file.txt", "c:/temp"); test_relative_to( "c:/other/test/inner/i2/file.txt", "c:/other/test"); return 0; } Best, John