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19 lines
797 B
19 lines
797 B
5 years ago
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An address pointing into a C++ `std::vector` might have become
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invalid. This can happen when an address is taken into a vector, then
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the vector is mutated in a way that might invalidate the address, for
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example by adding elements to the vector, which might trigger a
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re-allocation of the entire vector contents (thereby invalidating the
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pointers into the previous location of the contents).
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For example:
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```C++
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void deref_vector_element_after_push_back_bad(std::vector<int>& vec) {
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int* elt = &vec[1];
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vec.push_back(42); // if the array backing the vector was full already, this
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// will re-allocate it and copy the previous contents
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// into the new array, then delete the previous array
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std::cout << *y << "\n"; // bad: elt might be invalid
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}
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```
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