cxx/test/language.support/support.exception/propagation/current_exception.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <exception>

// exception_ptr current_exception();

#include <exception>
#include <cassert>

struct A
{
    static int constructed;

    A() {++constructed;}
    ~A() {--constructed;}
    A(const A&)  {++constructed;}
};

int A::constructed = 0;

int main()
{
    {
        std::exception_ptr p = std::current_exception();
        assert(p == nullptr);
    }
    {
        try
        {
            assert(A::constructed == 0);
            throw A();
            assert(false);
        }
        catch (...)
        {
            assert(A::constructed == 1);
        }
        assert(A::constructed == 0);
    }
    assert(A::constructed == 0);
    {
        std::exception_ptr p2;
        try
        {
            assert(A::constructed == 0);
            throw A();
            assert(false);
        }
        catch (...)
        {
            std::exception_ptr p = std::current_exception();
            assert(A::constructed == 1);
            assert(p != nullptr);
            p2 = std::current_exception();
            assert(A::constructed == 1);
            assert(p == p2);
        }
        assert(A::constructed == 1);
    }
    assert(A::constructed == 0);
    {
        std::exception_ptr p2;
        try
        {
            assert(A::constructed == 0);
            throw A();
            assert(false);
        }
        catch (A& a)
        {
            std::exception_ptr p = std::current_exception();
            assert(A::constructed == 1);
            assert(p != nullptr);
            p2 = std::current_exception();
            assert(A::constructed == 1);
            assert(p == p2);
        }
        assert(A::constructed == 1);
    }
    assert(A::constructed == 0);
    {
        std::exception_ptr p2;
        try
        {
            assert(A::constructed == 0);
            throw A();
            assert(false);
        }
        catch (A a)
        {
            std::exception_ptr p = std::current_exception();
            assert(A::constructed == 2);
            assert(p != nullptr);
            p2 = std::current_exception();
            assert(A::constructed == 2);
            assert(p == p2);
        }
        assert(A::constructed == 1);
    }
    assert(A::constructed == 0);
    {
        try
        {
            assert(A::constructed == 0);
            throw A();
            assert(false);
        }
        catch (...)
        {
            assert(A::constructed == 1);
            try
            {
                assert(A::constructed == 1);
                throw;
                assert(false);
            }
            catch (...)
            {
                assert(A::constructed == 1);
            }
            assert(A::constructed == 1);
        }
        assert(A::constructed == 0);
    }
    assert(A::constructed == 0);
    {
        try
        {
            assert(A::constructed == 0);
            throw A();
            assert(false);
        }
        catch (...)
        {
            assert(A::constructed == 1);
            try
            {
                std::exception_ptr p = std::current_exception();
                assert(A::constructed == 1);
                assert(p != nullptr);
                throw;
                assert(false);
            }
            catch (...)
            {
                assert(A::constructed == 1);
            }
            assert(A::constructed == 1);
        }
        assert(A::constructed == 0);
    }
    assert(A::constructed == 0);
    {
        try
        {
            assert(A::constructed == 0);
            throw A();
            assert(false);
        }
        catch (...)
        {
            assert(A::constructed == 1);
            try
            {
                assert(A::constructed == 1);
                throw;
                assert(false);
            }
            catch (...)
            {
                std::exception_ptr p = std::current_exception();
                assert(A::constructed == 1);
                assert(p != nullptr);
            }
            assert(A::constructed == 1);
        }
        assert(A::constructed == 0);
    }
    assert(A::constructed == 0);
    {
        try
        {
            assert(A::constructed == 0);
            throw A();
            assert(false);
        }
        catch (...)
        {
            assert(A::constructed == 1);
            try
            {
                assert(A::constructed == 1);
                throw;
                assert(false);
            }
            catch (...)
            {
                assert(A::constructed == 1);
            }
            std::exception_ptr p = std::current_exception();
            assert(A::constructed == 1);
            assert(p != nullptr);
        }
        assert(A::constructed == 0);
    }
    assert(A::constructed == 0);
    {
        try
        {
            assert(A::constructed == 0);
            throw A();
            assert(false);
        }
        catch (...)
        {
            assert(A::constructed == 1);
            try
            {
                assert(A::constructed == 1);
                throw;
                assert(false);
            }
            catch (...)
            {
                assert(A::constructed == 1);
            }
            assert(A::constructed == 1);
        }
        std::exception_ptr p = std::current_exception();
        assert(A::constructed == 0);
        assert(p == nullptr);
    }
    assert(A::constructed == 0);
    {
        std::exception_ptr p;
        try
        {
            assert(A::constructed == 0);
            throw A();
            assert(false);
        }
        catch (...)
        {
            assert(A::constructed == 1);
            try
            {
                assert(A::constructed == 1);
                throw;
                assert(false);
            }
            catch (...)
            {
                p = std::current_exception();
                assert(A::constructed == 1);
            }
            assert(A::constructed == 1);
        }
        assert(A::constructed == 1);
        assert(p != nullptr);
    }
    assert(A::constructed == 0);
}