Method testStrongGurantee

test/object.cpp:1693–1731

    }

    void
    testStrongGurantee()
    {
        // We used to preemptively reserve storage even if we don't add a new
        // element. That violated strong guarantee requirement. This test
        // checks we don't do that any more.

        object o;
        o.reserve(100);
        std::size_t const capacity = o.capacity();
        for( std::size_t i = 0; i < o.capacity() ; ++i )
            o.emplace( std::to_string(i), i );
        BOOST_ASSERT( capacity == o.capacity() );

        BOOST_TEST( !o.emplace("0", 0).second );
        BOOST_TEST( capacity == o.capacity() );

        BOOST_TEST( !o.insert_or_assign("0", 0).second );
        BOOST_TEST( capacity == o.capacity() );

        o["0"] = 0;
        BOOST_TEST( capacity == o.capacity() );

        o.insert( key_value_pair("0", nullptr) );
        BOOST_TEST( capacity == o.capacity() );

        // Check that insertion rolls back reserve when cannot insert all
        // elements.
        std::array<throws_on_convert, 10> input;
        try
        {
            o.insert( input.begin(), input.end() );
        }
        catch( ... )
        {
            // ignore
        }
        BOOST_TEST( capacity == o.capacity() );
    }

    void
    run()