Function getEnvironmentVariable

src/osvr/Common/GetEnvironmentVariable.cpp:46–48

On Windows, only desktop apps actually have the getenv function available to them, so this implementation just always returns not defined.

    /// available to them, so this implementation just always returns not
    /// defined.
    boost::optional<std::string> getEnvironmentVariable(std::string const &) {
        return boost::optional<std::string>();
    }
#else
    /// A real implementation of the functionality.
    boost::optional<std::string>