================
@@ -0,0 +1,118 @@
+.. title:: clang-tidy - readability-redundant-nested-if
+
+readability-redundant-nested-if
+===============================
+
+Finds nested ``if`` statements that can be merged by combining their conditions
+with ``&&``.
+
+Example:
+
+.. code-block:: c++
+
+ if (a) {
+ if (b) {
+ work();
+ }
+ }
+
+becomes
+
+.. code-block:: c++
+
+ if ((a) && (b)) {
+ work();
+ }
+
+The check can merge longer chains as well:
+
+.. code-block:: c++
+
+ if (a) {
+ if (b) {
+ if (c) {
+ work();
+ }
+ }
+ }
+
+becomes
+
+.. code-block:: c++
+
+ if ((a) && (b) && (c)) {
+ work();
+ }
+
+The check also supports outer declaration conditions in C++17 and later:
+
+.. code-block:: c++
+
+ if (bool x = ready()) {
+ if (can_run()) {
+ work();
+ }
+ }
+
+becomes
+
+.. code-block:: c++
+
+ if (bool x = ready(); x && (can_run())) {
+ work();
+ }
+
+Safety rules
+------------
+
+The check only transforms chains where:
+
+- Neither outer nor nested ``if`` has an ``else`` branch.
+- Nested merged ``if`` statements do not use condition variables.
----------------
EugeneZelenko wrote:
```suggestion
- Nested merged ``if`` statements do not use condition variables.
```
Same for other list entries.
https://github.com/llvm/llvm-project/pull/181558
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