In what cases should I use memcpy over standard operators in C++?

Question

When can I get better performance using memcpy or how do I benefit from using it? For example:

float a[3]; float b[3];

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Answer 1

The benefits of memcpy? Probably readability. Otherwise, you would have to either do a number of assignments or have a for loop for copying, neither of which are as simple and clear as just doing memcpy (of course, as long as your types are simple and don't require construction/destruction).

Also, memcpy is generally relatively optimized for specific platforms, to the point that it won't be all that much slower than simple assignment, and may even be faster.