# Extra Clang Tools 4 documentation

## clang-tidy - cppcoreguidelines-pro-bounds-constant-array-index

# cppcoreguidelines-pro-bounds-constant-array-index

This check flags all array subscript expressions on static arrays and `std::arrays` that either do not have a constant integer expression index or are out of bounds (for `std::array`). For out-of-bounds checking of static arrays, see the -Warray-bounds Clang diagnostic.

This rule is part of the “Bounds safety” profile of the C++ Core Guidelines, see https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Pro-bounds-arrayindex.

## Options

`GslHeader```

  The check can generate fixes after this option has been set to the name of the include file that contains `gsl::at()`, e.g. “gsl/gsl.h”.

`IncludeStyle```

  A string specifying which include-style is used, llvm or google. Default is llvm.