How Can I Enable Bound Checking for GCC STL `operator[]` and Iterators?

Enabling Bound Checking for GCC STL operator[] and Iterators

To ensure the validity of array accesses performed via operator[] and iterators, developers can enable bound checking for the GCC Standard Template Library (STL). This can be achieved by compiling code with the flag -D_GLIBCXX_DEBUG.

When bound checking is enabled, the STL will perform runtime checks to ensure that array accesses are always within bounds. This helps detect and prevent out-of-bounds errors, which can lead to program crashes or undefined behavior.

For random-access containers, in addition to operator[], the at() operation also provides bounds checking by default. This operation throws a std::out_of_range exception if the specified index is outside the container's bounds.

It's important to note that enabling bound checking can introduce some runtime overhead, especially for performance-critical operations. However, it can provide valuable safeguards against potential errors, making code more robust and reliable.

References:

• [GCC STL Debug Mode](http://gcc.gnu.org/onlinedocs/libstdc /manual/debug_mode_using.html#debug_mode.using.mode)
• [std::vector::at(), std::deque::at(), and std::array::at()](https://en.cppreference.com/w/cpp/container/vector/at)

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