Re: Is pushing into reserved space invalidating iterators?
On Mar 5, 5:08 am, MathGis <mtahilfer...@hotmail.com> 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?
return *i; // Debug Assertion failed: vector iterator not
dereferencable?
}
I had understood that iterators only become invalid when vector
operations cause reallocation.
Maarten Hilferink
According to B. Stroustrup "The C++ Programming Language" Your use of
vector::reserve is correct.
Moreover, end iterator should not be invalid after push_back(because,
when You get it's value,
it's set to begin). Plus, that code compiled and worked under Linux/
gcc 4.
But, on http://msdn2.microsoft.com/en-us/library/9xd04bzs(VS.80).aspx
and
http://www.sgi.com/tech/stl/Vector.html it's written, that the only
iterators, which
are guaranteed to be valid after insertion, are the ones before
insertion point.
I'm guessing that, because end is the element after the last one, it
can be invalid after insertion.
Mateusz Adamczyk
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