I like GCD syntax better than NSOperations, but currently my app has to support 10.5. And I don't want to have to test two different execution paths for 10.5 and 10.6+. So I'm basing the one to use off the MIN_REQUIRED macro, which per TN2064 will be the same as the DEPLOYMENT_TARGET. My GCD code doesn't execute now, but will whenever I can drop…

gistfile1.txt

        if (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_6) {
              // Use NSOperations
        }
        else {
              // Use GCD
        }