//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <string>

// size_type find(const basic_string& str, size_type pos = 0) const; // constexpr since C++20

#include <string>
#include <cassert>

#include "test_macros.h"
#include "min_allocator.h"

template <class S>
TEST_CONSTEXPR_CXX20 void test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x) {
  LIBCPP_ASSERT_NOEXCEPT(s.find(str, pos));
  assert(s.find(str, pos) == x);
  if (x != S::npos)
    assert(pos <= x && x + str.size() <= s.size());
}

template <class S>
TEST_CONSTEXPR_CXX20 void test(const S& s, const S& str, typename S::size_type x) {
  LIBCPP_ASSERT_NOEXCEPT(s.find(str));
  assert(s.find(str) == x);
  if (x != S::npos)
    assert(0 <= x && x + str.size() <= s.size());
}

template <class S>
TEST_CONSTEXPR_CXX20 void test0() {
  test(S(""), S(""), 0, 0);
  test(S(""), S("abcde"), 0, S::npos);
  test(S(""), S("abcdeabcde"), 0, S::npos);
  test(S(""), S("abcdeabcdeabcdeabcde"), 0, S::npos);
  test(S(""), S(""), 1, S::npos);
  test(S(""), S("abcde"), 1, S::npos);
  test(S(""), S("abcdeabcde"), 1, S::npos);
  test(S(""), S("abcdeabcdeabcdeabcde"), 1, S::npos);
  test(S("abcde"), S(""), 0, 0);
  test(S("abcde"), S("a"), 0, 0);
  test(S("abcde"), S("abcde"), 0, 0);
  test(S("abcde"), S("abcdeabcde"), 0, S::npos);
  test(S("abcde"), S("abcdeabcdeabcdeabcde"), 0, S::npos);
  test(S("abcde"), S(""), 1, 1);
  test(S("abcde"), S("a"), 1, S::npos);
  test(S("abcde"), S("abcde"), 1, S::npos);
  test(S("abcde"), S("abcdeabcde"), 1, S::npos);
  test(S("abcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
  test(S("abcde"), S(""), 2, 2);
  test(S("abcde"), S("a"), 2, S::npos);
  test(S("abcde"), S("abcde"), 2, S::npos);
  test(S("abcde"), S("abcdeabcde"), 2, S::npos);
  test(S("abcde"), S("abcdeabcdeabcdeabcde"), 2, S::npos);
  test(S("abcde"), S(""), 4, 4);
  test(S("abcde"), S("abcde"), 4, S::npos);
  test(S("abcde"), S("abcdeabcde"), 4, S::npos);
  test(S("abcde"), S("abcdeabcdeabcdeabcde"), 4, S::npos);
  test(S("abcde"), S(""), 5, 5);
  test(S("abcde"), S("a"), 5, S::npos);
  test(S("abcde"), S("abcde"), 5, S::npos);
  test(S("abcde"), S("abcdeabcde"), 5, S::npos);
  test(S("abcde"), S("abcdeabcdeabcdeabcde"), 5, S::npos);
  test(S("abcde"), S(""), 6, S::npos);
  test(S("abcde"), S("a"), 6, S::npos);
  test(S("abcde"), S("abcde"), 6, S::npos);
  test(S("abcde"), S("abcdeabcde"), 6, S::npos);
  test(S("abcde"), S("abcdeabcdeabcdeabcde"), 6, S::npos);
  test(S("abcdeabcde"), S(""), 0, 0);
  test(S("abcdeabcde"), S("a"), 0, 0);
  test(S("abcdeabcde"), S("abcde"), 0, 0);
  test(S("abcdeabcde"), S("abcdeabcde"), 0, 0);
  test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 0, S::npos);
  test(S("abcdeabcde"), S(""), 1, 1);
  test(S("abcdeabcde"), S("a"), 1, 5);
  test(S("abcdeabcde"), S("abcde"), 1, 5);
  test(S("abcdeabcde"), S("abcdeabcde"), 1, S::npos);
  test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
  test(S("abcdeabcde"), S(""), 5, 5);
  test(S("abcdeabcde"), S("a"), 5, 5);
  test(S("abcdeabcde"), S("abcde"), 5, 5);
  test(S("abcdeabcde"), S("abcdeabcde"), 5, S::npos);
  test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 5, S::npos);
  test(S("abcdeabcde"), S(""), 9, 9);
  test(S("abcdeabcde"), S("a"), 9, S::npos);
  test(S("abcdeabcde"), S("abcde"), 9, S::npos);
  test(S("abcdeabcde"), S("abcdeabcde"), 9, S::npos);
  test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 9, S::npos);
  test(S("abcdeabcde"), S(""), 10, 10);
  test(S("abcdeabcde"), S("a"), 10, S::npos);
  test(S("abcdeabcde"), S("abcde"), 10, S::npos);
  test(S("abcdeabcde"), S("abcdeabcde"), 10, S::npos);
  test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 10, S::npos);
  test(S("abcdeabcde"), S(""), 11, S::npos);
  test(S("abcdeabcde"), S("a"), 11, S::npos);
  test(S("abcdeabcde"), S("abcde"), 11, S::npos);
  test(S("abcdeabcde"), S("abcdeabcde"), 11, S::npos);
  test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 11, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S(""), 0, 0);
  test(S("abcdeabcdeabcdeabcde"), S("a"), 0, 0);
  test(S("abcdeabcdeabcdeabcde"), S("abcde"), 0, 0);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 0, 0);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0, 0);
  test(S("abcdeabcdeabcdeabcde"), S(""), 1, 1);
  test(S("abcdeabcdeabcdeabcde"), S("a"), 1, 5);
  test(S("abcdeabcdeabcdeabcde"), S("abcde"), 1, 5);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 1, 5);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S(""), 10, 10);
  test(S("abcdeabcdeabcdeabcde"), S("a"), 10, 10);
  test(S("abcdeabcdeabcdeabcde"), S("abcde"), 10, 10);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 10, 10);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 10, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S(""), 19, 19);
  test(S("abcdeabcdeabcdeabcde"), S("a"), 19, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S("abcde"), 19, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 19, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 19, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S(""), 20, 20);
  test(S("abcdeabcdeabcdeabcde"), S("a"), 20, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S("abcde"), 20, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 20, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 20, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S(""), 21, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S("a"), 21, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S("abcde"), 21, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 21, S::npos);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 21, S::npos);
}

template <class S>
TEST_CONSTEXPR_CXX20 void test1() {
  test(S(""), S(""), 0);
  test(S(""), S("abcde"), S::npos);
  test(S(""), S("abcdeabcde"), S::npos);
  test(S(""), S("abcdeabcdeabcdeabcde"), S::npos);
  test(S("abcde"), S(""), 0);
  test(S("abcde"), S("abcde"), 0);
  test(S("abcde"), S("abcdeabcde"), S::npos);
  test(S("abcde"), S("abcdeabcdeabcdeabcde"), S::npos);
  test(S("abcdeabcde"), S(""), 0);
  test(S("abcdeabcde"), S("abcde"), 0);
  test(S("abcdeabcde"), S("abcdeabcde"), 0);
  test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), S::npos);
  test(S("abcdeabcdeabcdeabcde"), S(""), 0);
  test(S("abcdeabcdeabcdeabcde"), S("abcde"), 0);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 0);
  test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0);
}

template <class S>
TEST_CONSTEXPR_CXX20 void test_string() {
  test0<S>();
  test1<S>();
}

TEST_CONSTEXPR_CXX20 bool test() {
  test_string<std::string>();
#if TEST_STD_VER >= 11
  test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
#endif
#if TEST_STD_VER >= 11
  { // LWG 2946
    std::string s = " !";
    assert(s.find({"abc", 1}) == std::string::npos);
  }
#endif

  return true;
}

int main(int, char**) {
  test();
#if TEST_STD_VER > 17
  static_assert(test());
#endif

  return 0;
}