diff options
Diffstat (limited to 'doc')
-rw-r--r-- | doc/tut1.txt | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/doc/tut1.txt b/doc/tut1.txt index 91bff41d7..2e7f9d27f 100644 --- a/doc/tut1.txt +++ b/doc/tut1.txt @@ -1592,6 +1592,17 @@ rules apply: write(stdout, x(3)) # ambiguous: which `x` is to call? +Excluding symbols +----------------- + +The normal ``import`` statement will bring in all exported symbols. +These can be limited by naming symbols which should be excluded with +the ``except`` qualifier. + +.. code-block:: nimrod + import mymodule except y + + From statement -------------- @@ -1602,6 +1613,30 @@ exported symbols. An alternative that only imports listed symbols is the .. code-block:: nimrod from mymodule import x, y, z +The ``from`` statement can also force namespace qualification on +symbols, thereby making symbols available, but needing to be qualified +to be used. + +.. code-block:: nimrod + from mymodule import x, y, z + + x() # use x without any qualification + +.. code-block:: nimrod + from mymodule import nil + + mymodule.x() # must qualify x with the module name as prefix + + x() # using x here without qualification is a compile error + +Since module names are generally long to be descriptive, you can also +define a shorter alias to use when qualifying symbols. + +.. code-block:: nimrod + from mymodule as m import nil + + m.x() # m is aliasing mymodule + Include statement ----------------- |