uninitialized_copy_n.pass.cpp [plain text]
#include <memory>
#include <cassert>
struct B
{
static int count_;
int data_;
explicit B() : data_(1) {}
B(const B& b) {if (++count_ == 3) throw 1; data_ = b.data_;}
~B() {data_ = 0;}
};
int B::count_ = 0;
int main()
{
const int N = 5;
char pool[sizeof(B)*N] = {0};
B* bp = (B*)pool;
B b[N];
try
{
std::uninitialized_copy_n(b, 5, bp);
assert(false);
}
catch (...)
{
for (int i = 0; i < N; ++i)
assert(bp[i].data_ == 0);
}
B::count_ = 0;
std::uninitialized_copy_n(b, 2, bp);
for (int i = 0; i < 2; ++i)
assert(bp[i].data_ == 1);
}