What are the string limits for the Standard Template Library in C++?
+16
A:
#include <iostream>
#include <string>
int main() {
std::cout << std::string().max_size() << std::endl;
return 0;
}
Alex B
2009-10-05 17:18:49
yea, interesting that `std::string::allocator_type().max_size()` gives a different (larger) answer. Not sure why that is..
Evan Teran
2009-10-05 17:27:44
The specific semantics of `max_size()` for allocators is rather vague.
Pavel Minaev
2009-10-05 17:32:29
@Pavel: agreed, but std::allocator<T> is supposed to return "how many of T can I theoretically allocate contiguously". On my system this is `size_type(-1)`...But `std::string::max()` is about a quarter of that which seems odd that it would be so conservative. I mean, if the allocator says it might be able to, why not try and let it fail with a `std::length_error` (as it would anyway)?
Evan Teran
2009-10-05 17:57:39