std::string OEFileTempPath()
Returns a system dependent directory for storing temporary files.
On Linux or OSX this defaults to /tmp, unless the TMPDIR environment variable is specified, in which case that directory is used if it exists.
On Windows, this defaults to C:\\Temp and then C:\\Tmp if that doesn’t exist. If the TEMP or TMP environment variables are set and point to a valid directory, that directory is used instead.