//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <string>

// iterator erase(const_iterator p);

#include <string>
#include <cassert>

template <class S>
void
test(S s, typename S::difference_type pos, S expected)
{
    typename S::const_iterator p = s.begin() + pos;
    typename S::iterator i = s.erase(p);
    assert(s.__invariants());
    assert(s == expected);
    assert(i - s.begin() == pos);
}

int main()
{
    typedef std::string S;
    test(S("abcde"), 0, S("bcde"));
    test(S("abcde"), 1, S("acde"));
    test(S("abcde"), 2, S("abde"));
    test(S("abcde"), 4, S("abcd"));
    test(S("abcdefghij"), 0, S("bcdefghij"));
    test(S("abcdefghij"), 1, S("acdefghij"));
    test(S("abcdefghij"), 5, S("abcdeghij"));
    test(S("abcdefghij"), 9, S("abcdefghi"));
    test(S("abcdefghijklmnopqrst"), 0, S("bcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 1, S("acdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 10, S("abcdefghijlmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 19, S("abcdefghijklmnopqrs"));
}