[Insight-developers] Explicit instantiation

[Hans Johnson]

N=1 test for explicit instantiation:  14.3% speed improvement in
compilations

Mitigating factors:
*** Only 1 part of the ITK has explicit instantiation (Common), and that
part of the tool kit has code that is for the most part straight forward for
compiliation/optimization (i.e. Very few algorithmic items that tax the
compilers optimizers).
*** No simpleITK or wrapping options turned on.

Hans


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