//===----------------------------------------------------------------------===//
//
//                     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>&
//   operator=(const basic_string<charT,traits,Allocator>& str);

#include <string>
#include <cassert>

template <class S>
void
test(S s1, const S& s2)
{
    s1 = s2;
    assert(s1.__invariants());
    assert(s1 == s2);
    assert(s1.capacity() >= s1.size());
}

int main()
{
    typedef std::string S;
    test(S(), S());
    test(S("1"), S());
    test(S(), S("1"));
    test(S("1"), S("2"));
    test(S("1"), S("2"));

    test(S(),
         S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
    test(S("123456789"),
         S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
         S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
           "1234567890123456789012345678901234567890123456789012345678901234567890"),
         S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
}