[SofaKernel] change data content copy on write condition #2285
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The Data's hold their actual content within a dedicated container called DataContentValue.
Two versions of this containers exists, on holding the data using a copy-on-write mechanism while an other is using a systematic copy.
Currently the selection is based on the content of DataTypeInfo, I found it more explicit and clear to rely on type_traits to select the proper DataContentValue version.
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