RunTimeTyped : IECore::assertedStaticCast allow null source pointer #1335
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* use approach taken by boost polymorphic_downcast and compare source pointer to casted pointer, this has added benefit of not compiling if Target type cannot be converted to Source type so should detect programming errors at compile time.
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Use approach taken by boost polymorphic_downcast and compare source pointer to casted pointer, this has added benefit of not compiling if Target type cannot be converted to Source type so should detect programming errors at compile time.
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