Angus Leeming <[EMAIL PROTECTED]> writes:
| Angus Leeming wrote:
>
>> Angus Leeming wrote:
>>> Lars Gullik Bjønnes wrote:
>>>> note the member function boost::any:type
>>>
>>> Bingo! No need for exceptions after all.
>>> Many thanks, Lars.
>>
>> Next iteration. I think that this is ready to convert into InsetExternal
>> code.
>
| Hmmppfff! trying to do so, I get this
>
| ../../../boost/boost/any.hpp: In function `ValueType boost::any_cast(const
| boost::any&) [with ValueType = lyx::external::RotationCommandFactory]':
| ../../../src/insets/ExternalTemplate.h:54: instantiated from `void
| lyx::external::TransformStore::getTransformer(const Data&, Transformer&)
| const [with Factory = lyx::external::RotationCommandFactory, Data =
| lyx::external::RotationData, Transformer = std::auto_ptr<const
| lyx::external::TransformCommand>]'
| ../../../src/insets/insetexternal.C:790: instantiated from here
| ../../../boost/boost/any.hpp:174: exception handling disabled, use
| -fexceptions to enable
>
| template<typename ValueType>
| ValueType any_cast(const any & operand)
| {
| const ValueType * result = any_cast<ValueType>(&operand);
| if(!result)
| throw bad_any_cast();
| return *result;
| }
>
| Could I insert
| BOOST_ASSERT(result);
| in its place please? The code is safe:
>
| if (any_factory.type() != typeid(Factory) ||
| any_data.type() != typeid(Data))
| return;
>
| Factory * factory = boost::any_cast<Factory>(any_factory);
| if (!factory.empty())
| transformer = factory(data);
But aren't you using the wrong any_cast here?
Shouldn't you use boost::any_cast<Factory*>?
Hmm... there is something I do not understand here. any_cast with a
refernece or a value type will throw if cast to the wrong type, but if
a pointer type then 0 will be returned when wrong type is used?
--
Lgb
