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Editorial Team
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Asked: 2026-05-15T15:19:09+00:00

I am writing a cross-platform compatible function in C++ that creates directories based on

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I am writing a cross-platform compatible function in C++ that creates directories based on input filenames. I need to know if the machine is Linux or windows and use the appropriate forward or back slash. For the following code below, if the machine is Linux then isLinux = true. How do I determine the OS? 

bool isLinux;
std::string slash;
std::string directoryName;

if isLinux
   slash = "/";
else
   slash = "\\";
end

boost::filesystem::create_directory (full_path.native_directory_string() + slash + directoryName);
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1 Answer

  1. Editorial Team

    Use:

    #if defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__)
static const std::string slash="\\";
#else
static const std::string slash="/";
#endif

    BTW, you can still safely use this slash “/” on Windows as windows understands this perfectly. So just sticking with “/” slash would solve problems for all OSes even like OpenVMS where path is foo:[bar.bee]test.ext can be represented as /foo/bar/bee/test.ext.

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