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//===----------------------------------------------------------------------===//
//
// 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 first, const_iterator last);
#include <string>
#include <cassert>
template <class S>
void
test(S s, typename S::difference_type pos, typename S::difference_type n, S expected)
{
typename S::const_iterator first = s.cbegin() + pos;
typename S::const_iterator last = s.cbegin() + pos + n;
typename S::iterator i = s.erase(first, last);
assert(s.__invariants());
assert(s == expected);
assert(i - s.begin() == pos);
}
int main()
{
typedef std::string S;
test(S(""), 0, 0, S(""));
test(S("abcde"), 0, 0, S("abcde"));
test(S("abcde"), 0, 1, S("bcde"));
test(S("abcde"), 0, 2, S("cde"));
test(S("abcde"), 0, 4, S("e"));
test(S("abcde"), 0, 5, S(""));
test(S("abcde"), 1, 0, S("abcde"));
test(S("abcde"), 1, 1, S("acde"));
test(S("abcde"), 1, 2, S("ade"));
test(S("abcde"), 1, 3, S("ae"));
test(S("abcde"), 1, 4, S("a"));
test(S("abcde"), 2, 0, S("abcde"));
test(S("abcde"), 2, 1, S("abde"));
test(S("abcde"), 2, 2, S("abe"));
test(S("abcde"), 2, 3, S("ab"));
test(S("abcde"), 4, 0, S("abcde"));
test(S("abcde"), 4, 1, S("abcd"));
test(S("abcde"), 5, 0, S("abcde"));
test(S("abcdefghij"), 0, 0, S("abcdefghij"));
test(S("abcdefghij"), 0, 1, S("bcdefghij"));
test(S("abcdefghij"), 0, 5, S("fghij"));
test(S("abcdefghij"), 0, 9, S("j"));
test(S("abcdefghij"), 0, 10, S(""));
test(S("abcdefghij"), 1, 0, S("abcdefghij"));
test(S("abcdefghij"), 1, 1, S("acdefghij"));
test(S("abcdefghij"), 1, 4, S("afghij"));
test(S("abcdefghij"), 1, 8, S("aj"));
test(S("abcdefghij"), 1, 9, S("a"));
test(S("abcdefghij"), 5, 0, S("abcdefghij"));
test(S("abcdefghij"), 5, 1, S("abcdeghij"));
test(S("abcdefghij"), 5, 2, S("abcdehij"));
test(S("abcdefghij"), 5, 4, S("abcdej"));
test(S("abcdefghij"), 5, 5, S("abcde"));
test(S("abcdefghij"), 9, 0, S("abcdefghij"));
test(S("abcdefghij"), 9, 1, S("abcdefghi"));
test(S("abcdefghij"), 10, 0, S("abcdefghij"));
test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"));
test(S("abcdefghijklmnopqrst"), 0, 1, S("bcdefghijklmnopqrst"));
test(S("abcdefghijklmnopqrst"), 0, 10, S("klmnopqrst"));
test(S("abcdefghijklmnopqrst"), 0, 19, S("t"));
test(S("abcdefghijklmnopqrst"), 0, 20, S(""));
test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"));
test(S("abcdefghijklmnopqrst"), 1, 1, S("acdefghijklmnopqrst"));
test(S("abcdefghijklmnopqrst"), 1, 9, S("aklmnopqrst"));
test(S("abcdefghijklmnopqrst"), 1, 18, S("at"));
test(S("abcdefghijklmnopqrst"), 1, 19, S("a"));
test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"));
test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijlmnopqrst"));
test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijpqrst"));
test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijt"));
test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"));
test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"));
test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrs"));
test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"));
}
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