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.. title:: clang-tidy - readability-else-after-return
readability-else-after-return
=============================
`LLVM Coding Standards <https://llvm.org/docs/CodingStandards.html>`_ advises to
reduce indentation where possible and where it makes understanding code easier.
Early exit is one of the suggested enforcements of that. Please do not use
``else`` or ``else if`` after something that interrupts control flow - like
``return``, ``break``, ``continue``, ``throw``.
The following piece of code illustrates how the check works. This piece of code:
.. code-block:: c++
void foo(int Value) {
int Local = 0;
for (int i = 0; i < 42; i++) {
if (Value == 1) {
return;
} else {
Local++;
}
if (Value == 2)
continue;
else
Local++;
if (Value == 3) {
throw 42;
} else {
Local++;
}
}
}
Would be transformed into:
.. code-block:: c++
void foo(int Value) {
int Local = 0;
for (int i = 0; i < 42; i++) {
if (Value == 1) {
return;
}
Local++;
if (Value == 2)
continue;
Local++;
if (Value == 3) {
throw 42;
}
Local++;
}
}
Options
-------
.. option:: WarnOnUnfixable
When `true`, emit a warning for cases where the check can't output a
Fix-It. These can occur with declarations inside the ``else`` branch that
would have an extended lifetime if the ``else`` branch was removed.
Default value is `true`.
.. option:: WarnOnConditionVariables
When `true`, the check will attempt to refactor a variable defined inside
the condition of the ``if`` statement that is used in the ``else`` branch
defining them just before the ``if`` statement. This can only be done if
the ``if`` statement is the last statement in its parents scope.
Default value is `true`.
LLVM alias
----------
There is an alias of this check called llvm-else-after-return.
In that version the options :option:`WarnOnUnfixable` and
:option:`WarnOnConditionVariables` are both set to `false` by default.
This check helps to enforce this `LLVM Coding Standards recommendation
<https://llvm.org/docs/CodingStandards.html#don-t-use-else-after-a-return>`_.
|
