//===----------------------------------------------------------------------===//
//
// 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 charT* s, 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 typename S::value_type* 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) {
    typename S::size_type n = S::traits_type::length(str);
    assert(pos <= x && x + n <= s.size());
  }
}

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

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

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

  return true;
}

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

  return 0;
}
