Accessing Vector Elements in GDB
When debugging C code, it's crucial to examine the contents of data structures. For a std::vector, this can be especially challenging in GDB.
Addressing Vector Elements
In GCC 4.1.2, the internal array of a std::vector can be accessed via the pointer:
myVector._M_impl._M_start
where myVector is the name of the vector.
Printing Vector Elements
To print the entirety of a std::vector
print *(myVector._M_impl._M_start)@myVector.size()
This command prints all elements in the vector. To print only the first N elements, use:
print *(myVector._M_impl._M_start)@N
Explanation
The asterisk (*) is used to dereference the _M_start pointer, which points to the beginning of the internal array. The @ symbol specifies the number of elements to print.
This method is version-dependent and may vary with different compiler versions.
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