//===----------------------------------------------------------------------===//
//
//                     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>

// basic_string<charT,traits,Allocator>&
//   insert(size_type pos1, const basic_string& str);

#include <string>
#include <stdexcept>
#include <cassert>

template <class S>
void
test(S s, typename S::size_type pos, S str, S expected)
{
    typename S::size_type old_size = s.size();
    S s0 = s;
    try
    {
        s.insert(pos, str);
        assert(s.__invariants());
        assert(pos <= old_size);
        assert(s == expected);
    }
    catch (std::out_of_range&)
    {
        assert(pos > old_size);
        assert(s == s0);
    }
}

int main()
{
    typedef std::string S;
    test(S(""), 0, S(""), S(""));
    test(S(""), 0, S("12345"), S("12345"));
    test(S(""), 0, S("1234567890"), S("1234567890"));
    test(S(""), 0, S("12345678901234567890"), S("12345678901234567890"));
    test(S(""), 1, S(""), S("can't happen"));
    test(S(""), 1, S("12345"), S("can't happen"));
    test(S(""), 1, S("1234567890"), S("can't happen"));
    test(S(""), 1, S("12345678901234567890"), S("can't happen"));
    test(S("abcde"), 0, S(""), S("abcde"));
    test(S("abcde"), 0, S("12345"), S("12345abcde"));
    test(S("abcde"), 0, S("1234567890"), S("1234567890abcde"));
    test(S("abcde"), 0, S("12345678901234567890"), S("12345678901234567890abcde"));
    test(S("abcde"), 1, S(""), S("abcde"));
    test(S("abcde"), 1, S("12345"), S("a12345bcde"));
    test(S("abcde"), 1, S("1234567890"), S("a1234567890bcde"));
    test(S("abcde"), 1, S("12345678901234567890"), S("a12345678901234567890bcde"));
    test(S("abcde"), 2, S(""), S("abcde"));
    test(S("abcde"), 2, S("12345"), S("ab12345cde"));
    test(S("abcde"), 2, S("1234567890"), S("ab1234567890cde"));
    test(S("abcde"), 2, S("12345678901234567890"), S("ab12345678901234567890cde"));
    test(S("abcde"), 4, S(""), S("abcde"));
    test(S("abcde"), 4, S("12345"), S("abcd12345e"));
    test(S("abcde"), 4, S("1234567890"), S("abcd1234567890e"));
    test(S("abcde"), 4, S("12345678901234567890"), S("abcd12345678901234567890e"));
    test(S("abcde"), 5, S(""), S("abcde"));
    test(S("abcde"), 5, S("12345"), S("abcde12345"));
    test(S("abcde"), 5, S("1234567890"), S("abcde1234567890"));
    test(S("abcde"), 5, S("12345678901234567890"), S("abcde12345678901234567890"));
    test(S("abcde"), 6, S(""), S("can't happen"));
    test(S("abcde"), 6, S("12345"), S("can't happen"));
    test(S("abcde"), 6, S("1234567890"), S("can't happen"));
    test(S("abcde"), 6, S("12345678901234567890"), S("can't happen"));
    test(S("abcdefghij"), 0, S(""), S("abcdefghij"));
    test(S("abcdefghij"), 0, S("12345"), S("12345abcdefghij"));
    test(S("abcdefghij"), 0, S("1234567890"), S("1234567890abcdefghij"));
    test(S("abcdefghij"), 0, S("12345678901234567890"), S("12345678901234567890abcdefghij"));
    test(S("abcdefghij"), 1, S(""), S("abcdefghij"));
    test(S("abcdefghij"), 1, S("12345"), S("a12345bcdefghij"));
    test(S("abcdefghij"), 1, S("1234567890"), S("a1234567890bcdefghij"));
    test(S("abcdefghij"), 1, S("12345678901234567890"), S("a12345678901234567890bcdefghij"));
    test(S("abcdefghij"), 5, S(""), S("abcdefghij"));
    test(S("abcdefghij"), 5, S("12345"), S("abcde12345fghij"));
    test(S("abcdefghij"), 5, S("1234567890"), S("abcde1234567890fghij"));
    test(S("abcdefghij"), 5, S("12345678901234567890"), S("abcde12345678901234567890fghij"));
    test(S("abcdefghij"), 9, S(""), S("abcdefghij"));
    test(S("abcdefghij"), 9, S("12345"), S("abcdefghi12345j"));
    test(S("abcdefghij"), 9, S("1234567890"), S("abcdefghi1234567890j"));
    test(S("abcdefghij"), 9, S("12345678901234567890"), S("abcdefghi12345678901234567890j"));
    test(S("abcdefghij"), 10, S(""), S("abcdefghij"));
    test(S("abcdefghij"), 10, S("12345"), S("abcdefghij12345"));
    test(S("abcdefghij"), 10, S("1234567890"), S("abcdefghij1234567890"));
    test(S("abcdefghij"), 10, S("12345678901234567890"), S("abcdefghij12345678901234567890"));
    test(S("abcdefghij"), 11, S(""), S("can't happen"));
    test(S("abcdefghij"), 11, S("12345"), S("can't happen"));
    test(S("abcdefghij"), 11, S("1234567890"), S("can't happen"));
    test(S("abcdefghij"), 11, S("12345678901234567890"), S("can't happen"));
    test(S("abcdefghijklmnopqrst"), 0, S(""), S("abcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 0, S("12345"), S("12345abcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 0, S("1234567890"), S("1234567890abcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 0, S("12345678901234567890"), S("12345678901234567890abcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 1, S(""), S("abcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 1, S("12345"), S("a12345bcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 1, S("1234567890"), S("a1234567890bcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 1, S("12345678901234567890"), S("a12345678901234567890bcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 10, S(""), S("abcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 10, S("12345"), S("abcdefghij12345klmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 10, S("1234567890"), S("abcdefghij1234567890klmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 10, S("12345678901234567890"), S("abcdefghij12345678901234567890klmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 19, S(""), S("abcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 19, S("12345"), S("abcdefghijklmnopqrs12345t"));
    test(S("abcdefghijklmnopqrst"), 19, S("1234567890"), S("abcdefghijklmnopqrs1234567890t"));
    test(S("abcdefghijklmnopqrst"), 19, S("12345678901234567890"), S("abcdefghijklmnopqrs12345678901234567890t"));
    test(S("abcdefghijklmnopqrst"), 20, S(""), S("abcdefghijklmnopqrst"));
    test(S("abcdefghijklmnopqrst"), 20, S("12345"), S("abcdefghijklmnopqrst12345"));
    test(S("abcdefghijklmnopqrst"), 20, S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
    test(S("abcdefghijklmnopqrst"), 20, S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
    test(S("abcdefghijklmnopqrst"), 21, S(""), S("can't happen"));
    test(S("abcdefghijklmnopqrst"), 21, S("12345"), S("can't happen"));
    test(S("abcdefghijklmnopqrst"), 21, S("1234567890"), S("can't happen"));
    test(S("abcdefghijklmnopqrst"), 21, S("12345678901234567890"), S("can't happen"));
}