clang-tidy - readability-else-after-return — Extra Clang Tools 4 documentation

# Extra Clang Tools 4 documentation

## clang-tidy - readability-else-after-return

# readability-else-after-return

LLVM Coding Standards 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:

    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:

    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++;
      }
    }

This check helps to enforce this LLVM Coding Standards recommendation.