| .. title:: clang-tidy - llvm-prefer-isa-or-dyn-cast-in-conditionals |
| |
| llvm-prefer-isa-or-dyn-cast-in-conditionals |
| =========================================== |
| |
| Looks at conditionals and finds and replaces cases of ``cast<>``, |
| which will assert rather than return a null pointer, and |
| ``dyn_cast<>`` where the return value is not captured. Additionally, |
| finds and replaces cases that match the pattern ``var && |
| isa<X>(var)``, where ``var`` is evaluated twice. |
| |
| .. code-block:: c++ |
| |
| // Finds these: |
| if (auto x = cast<X>(y)) {} |
| // is replaced by: |
| if (auto x = dyn_cast<X>(y)) {} |
| |
| if (cast<X>(y)) {} |
| // is replaced by: |
| if (isa<X>(y)) {} |
| |
| if (dyn_cast<X>(y)) {} |
| // is replaced by: |
| if (isa<X>(y)) {} |
| |
| if (var && isa<T>(var)) {} |
| // is replaced by: |
| if (isa_and_nonnull<T>(var.foo())) {} |
| |
| // Other cases are ignored, e.g.: |
| if (auto f = cast<Z>(y)->foo()) {} |
| if (cast<Z>(y)->foo()) {} |
| if (X.cast(y)) {} |
