Re: Is pushing into reserved space invalidating iterators?
MathGis wrote:
Hi,
Is the following code legal?
I'm asking since the iterator debugging facility of VC++2005's stl
gives an assertion failed at runtime.
#include <vector>
int main(int argc, char** argv)
{
std::vector<int> x;
x.reserve(1);
std::vector<int>::iterator i = x.end();
x.push_back(1); // No reallocation
if ( i != x.end()) // Debug Assertion failed: iterators
incompatible?
I do not see any reason for that failure.
return *i; // Debug Assertion failed: vector iterator not
dereferencable?
Nice catch by the compiler. You are not allowed to dereference a
standard container's end iterator. This restriction is independent of
the vector's size or capacity.
}
I had understood that iterators only become invalid when vector
operations cause reallocation.
My understanding is that push_back is not allowed to invalidate
iterators unless it requires a reallocation, i.e. unless v.capacity() ==
v.size() immediately before the insertion.
By the way, some readers (including me) will find your posts much more
readable if your code does not extend past 72 columns, including
indentation.
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