uninitialized_copy_n.pass.cpp revision b64f8b07c104c6cc986570ac8ee0ed16a9f23976 
1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <memory>
11
12// template <class InputIterator, class Size, class ForwardIterator>
13//   ForwardIterator
14//   uninitialized_copy_n(InputIterator first, Size n,
15//                        ForwardIterator result);
16
17#include <memory>
18#include <cassert>
19
20struct B
21{
22    static int count_;
23    int data_;
24    explicit B() : data_(1) {}
25    B(const B& b) {if (++count_ == 3) throw 1; data_ = b.data_;}
26    ~B() {data_ = 0;}
27};
28
29int B::count_ = 0;
30
31int main()
32{
33    const int N = 5;
34    char pool[sizeof(B)*N] = {0};
35    B* bp = (B*)pool;
36    B b[N];
37    try
38    {
39        std::uninitialized_copy_n(b, 5, bp);
40        assert(false);
41    }
42    catch (...)
43    {
44        for (int i = 0; i < N; ++i)
45            assert(bp[i].data_ == 0);
46    }
47    B::count_ = 0;
48    std::uninitialized_copy_n(b, 2, bp);
49    for (int i = 0; i < 2; ++i)
50        assert(bp[i].data_ == 1);
51}
52