|[eigen] Pass POD by reference or by pointer?|
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Many C++ books say pass by reference whenever possible. However, I find the
code below misleading.
81 template<typename Derived, typename ResultType>
82 void apply(const Derived&, ResultType&, bool&);
209 apply(b, res, init);
At line 209, it looks as if init would never be written. This is also why Qt
prefers pointers to references.
I think there is nothing wrong to pass a reference to a non-POD, but passing a
reference to a POD is functionally safe but syntactically misleading. Even if
we want the functional safety of a reference, we can pass a pointer-const
instead, but the constness seems unnecessary.
If passing a pointer is better, feel free to alter the code. ;)