GCC STL bound checking

Question

How do I enable bound checking for operator[] and iterators?

score 72 · Accepted Answer · edited Dec 27 '18 at 13:35

72

You can activate runtime iterator and bounds checking by compiling with -D_GLIBCXX_DEBUG. Also note that random-access containers provide the always bounds-checking at()-operation in addition to operator [].

References:

GCC STL debug mode: http://gcc.gnu.org/onlinedocs/libstdc++/manual/debug_mode_using.html#debug_mode.using.mode

at() operation: std::vector::at(), std::deque::at() and std::array::at()

edited Dec 27 '18 at 13:35

6502

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answered Apr 08 '11 at 11:59

Peter G.

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Note that using Debug Mode changes ABI, so you can't mix modules compiled with and without `-DGLIBCXX_DEBUG`. – Ruslan Oct 26 '17 at 06:57
@Ruslan The correct symbol name is `_GLIBCXX_DEBUG`. – Evg Sep 09 '20 at 12:39

score 1 · Answer 2 · answered Apr 08 '11 at 12:00

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you should overload the operator[] for your specific classes. If you want to use an existing STL container, the at() function is a bounds-checked version of the operator[].

answered Apr 08 '11 at 12:00

Tony The Lion

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GCC STL bound checking

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