Jason Rhinelander fd81a03ec9 Lazy instance value pointer allocation ... We currently allocate instance values when creating the instance itself (except when constructing the instance for a `cast()`), but there is no particular reason to do so: the instance itself and the internals (for a non-simple layout) are allocated via Python, with no reason to expect better locality from the invoked `operator new`. Moreover, it makes implementation of factory function constructors trickier and slightly less efficient: they don't use the pre-eallocate the memory, which means there is a pointless allocation and free. This commit makes the allocation lazy: instead of preallocating when creating the instance, the allocation happens when the instance is first loaded (if null at that time). In addition to making it more efficient to deal with cases that don't need preallocation, this also allows for a very slight performance increase by not needing to look up the instances types during allocation. (There is a lookup during the eventual load, of course, but that is happening already).		2017-08-17 09:33:27 -04:00
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pybind11	Lazy instance value pointer allocation	2017-08-17 09:33:27 -04:00