On 7/27/2010 12:38 PM, Robert Ramey wrote:
Kenneth Riddile wrote:
I have some xml archives that store a lot of floating point values. I would like to read these into a program that is designed to easily switch between using floats and a custom fixed-point type via a typedef. The way that would be easiest would be to add a serialize() method to the fixed-point class definition. However, the xml archive requires that I use an nvp wrapper. Since the data was originally serialized out as plain floats, the data looks something like this:
<x>0.95260203</x> <y>0.87517798</y> <z>0.54323343</z>
whereas, to serialize this into my fixed-point type, it would need another level of indirection due to the additional required nvp wrapper like so:
<x><value>0.95260203</value></x> <y><value>0.87517798</value></y> <z><value>0.54323343</value></z>
Is there a way to accomplish what I'm trying to do? The fixed-point type is convertible from (but not to) a float if that helps.
This doesn't have anything to do with serialization per se.
After loading, call a function which does whatever conversion you want to do.
Robert Ramey
I'm not sure I described things well enough. Say I have the following: typedef float Real; typedef Vector3<Real> Vector; and I have some xml archives containing serialized Vector objects that look like this: <x>-0.70032406</x> <y>-0.65001774</y> <z>0.29499683</z> Now, I won't be able to read in this archive if I change the Real typedef like so: typedef FixedPointClass Real; Even if I make FixedPointClass serializable, the data would need to contain an additional name-value pair for it to be readable, like so: <x><value>-0.70032406</value></x> <y><value>-0.65001774</value></y> <z><value>0.29499683</value></z> I know that I can fix this problem by splitting the serialization of Vector into save and load and explicitly loading floats and doing the conversion. The problem with that is that I have several other types in the same situation as Vector. I don't want to do it for all of them if I don't have to. I would rather do something once that's specific to FixedPointClass since that makes the most sense. Any suggestions or should I get started on writing lots of save/load templates?