Compiler Error: Passing std::vector<T2> to Function Taking std::vector<T1>

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SUMMARY

The discussion centers on the compiler error encountered when passing a std::vector to a function expecting a std::vector, where T2 is derived from T1. The consensus is that this approach will not compile due to type safety rules in C++. A vector of actual instances cannot be implicitly converted, unlike vectors of pointers or references. To resolve this, one must pass a pointer to the vector and ensure that the vector elements are of the same type.

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ehrenfest
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If I have a function that takes a std::vector< T1 > and I pass it a std::vector< T2 >, where T2 is publicly derived from T1, that should work, why does my compiler complain?
 
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What makes you think that should work? A vector of references or pointers might work; note well that I am not saying it will. A vector of actual instances is a different beast. I would think that this should not work.
 
You have to pass a pointer to the vector, and make sure the vector elements are the same.
 

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