github.com/jlmucb/cloudproxy@v0.0.0-20170830161738-b5aa0b619bc4/src/third_party/gflags/m4/google_namespace.m4 (about)

     1  # Allow users to override the namespace we define our application's classes in
     2  # Arg $1 is the default namespace to use if --enable-namespace isn't present.
     3  
     4  # In general, $1 should be 'google', so we put all our exported symbols in a
     5  # unique namespace that is not likely to conflict with anyone else.  However,
     6  # when it makes sense -- for instance, when publishing stl-like code -- you
     7  # may want to go with a different default, like 'std'.
     8  
     9  # We guarantee the invariant that GOOGLE_NAMESPACE starts with ::,
    10  # unless it's the empty string.  Thus, it's always safe to do
    11  # GOOGLE_NAMESPACE::foo and be sure you're getting the foo that's
    12  # actually in the google namespace, and not some other namespace that
    13  # the namespace rules might kick in.
    14  
    15  AC_DEFUN([AC_DEFINE_GOOGLE_NAMESPACE],
    16    [google_namespace_default=[$1]
    17     AC_ARG_ENABLE(namespace, [  --enable-namespace=FOO to define these Google
    18                               classes in the FOO namespace. --disable-namespace
    19                               to define them in the global namespace. Default
    20                               is to define them in namespace $1.],
    21                   [case "$enableval" in
    22                      yes) google_namespace="$google_namespace_default" ;;
    23                       no) google_namespace="" ;;
    24                        *) google_namespace="$enableval" ;;
    25                    esac],
    26                   [google_namespace="$google_namespace_default"])
    27     if test -n "$google_namespace"; then
    28       ac_google_namespace="::$google_namespace"
    29       ac_google_start_namespace="namespace $google_namespace {"
    30       ac_google_end_namespace="}"
    31     else
    32       ac_google_namespace=""
    33       ac_google_start_namespace=""
    34       ac_google_end_namespace=""
    35     fi
    36     AC_DEFINE_UNQUOTED(GOOGLE_NAMESPACE, $ac_google_namespace,
    37                        Namespace for Google classes)
    38     AC_DEFINE_UNQUOTED(_START_GOOGLE_NAMESPACE_, $ac_google_start_namespace,
    39                        Puts following code inside the Google namespace)
    40     AC_DEFINE_UNQUOTED(_END_GOOGLE_NAMESPACE_,  $ac_google_end_namespace,
    41                        Stops putting the code inside the Google namespace)
    42  ])