i did another test here, like this:
std::cout << boost::filesystem::native("C://PATH") << std::endl;
std::cout << boost::filesystem::native("C:/PATH") << std::endl;
std::cout << boost::filesystem::native("C:\\PATH") << std::endl;
std::cout << boost::filesystem::native("C:\PATH") << std::endl;
std::cout << boost::filesystem::native("\PATH") << std::endl;
std::cout << boost::filesystem::native("\\PATH") << std::endl;
std::cout << boost::filesystem::native("/PATH") << std::endl;
std::cout << boost::filesystem::native("//PATH") << std::endl;
std::cout << boost::filesystem::native("c\PATH") << std::endl;
std::cout << boost::filesystem::native("c\\PATH") << std::endl;
std::cout << boost::filesystem::native("c/PATH") << std::endl;
std::cout << boost::filesystem::native("c//PATH") << std::endl;
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