//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: no-exceptions
// <forward_list>

// void push_front(const value_type& x); // constexpr since C++26

#include <forward_list>
#include <cassert>
#include <exception>

#include "test_macros.h"

// Flag that makes the copy constructor for CMyClass throw an exception
static bool gCopyConstructorShouldThrow = false;

class CMyClass {
public:
  CMyClass();

public:
  CMyClass(const CMyClass& iOther);

public:
  ~CMyClass();

private:
  int fMagicValue;

private:
  static int kStartedConstructionMagicValue;

private:
  static int kFinishedConstructionMagicValue;
};

// Value for fMagicValue when the constructor has started running, but not yet finished
int CMyClass::kStartedConstructionMagicValue = 0;
// Value for fMagicValue when the constructor has finished running
int CMyClass::kFinishedConstructionMagicValue = 12345;

CMyClass::CMyClass() : fMagicValue(kStartedConstructionMagicValue) {
  // Signal that the constructor has finished running
  fMagicValue = kFinishedConstructionMagicValue;
}

CMyClass::CMyClass(const CMyClass& /*iOther*/) : fMagicValue(kStartedConstructionMagicValue) {
  // If requested, throw an exception _before_ setting fMagicValue to kFinishedConstructionMagicValue
  if (gCopyConstructorShouldThrow) {
    throw std::exception();
  }
  // Signal that the constructor has finished running
  fMagicValue = kFinishedConstructionMagicValue;
}

CMyClass::~CMyClass() {
  // Only instances for which the constructor has finished running should be destructed
  assert(fMagicValue == kFinishedConstructionMagicValue);
}

int main(int, char**) {
  CMyClass instance;
  std::forward_list<CMyClass> vec;

  vec.push_front(instance);

  gCopyConstructorShouldThrow = true;
  try {
    vec.push_front(instance);
  } catch (...) {
  }

  return 0;
}
