Deprecate the use of plain pointers as standard container iterators
Hallo,
I belive that the use of plain pointers as iterator types for standard
library containers should be deprecated, because it limits genericity
and portability.
The following code is valid on some platforms and not on others:
#include <vector>
#include <algorithm>
void f() {
std::vector<int> v;
v.push_back(3);
v.push_back(2);
v.push_back(1);
std::sort(++v.begin(), v.end());
}
If std::vector<>::iterator is a pointer the expression ++v.begin() is
invalid because it attempts to modify an rvalue.
The following code gives different results on different platforms:
#include <vector>
#include <algorithm>
#include <iostream>
int * find(int * b, int * e, int d) {
return b + d < e ? b + d : e;
}
int main() {
std::vector<int> v;
v.push_back(3);
v.push_back(2);
v.push_back(1);
std::vector<int>::iterator i = find(v.begin(), v.end(), 2);
std::cout << ( i != v.end() ? *i : 0 ) << '\n';
}
If std::vector<>::iterator is a pointer the user defined find function
is chosen.
Cheers,
Nicola Musatti
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