Vector math operations

[kiliakis]

Simple vector math operations are available through vector_math.h library. Operations supported:

• vector (+,-, *, /) vector
• vector (+,-,,/) scalar or scalar (+,-,,/) vector
• vector (+,-,*,/)= vector/scalar
• apply_f(vector, op) --> apply unary op to every element of vector and return the result
• apply_f(vector1, vector2, op) --> apply binary op to every pair of elements from vector1, vector2 and return the result
• apply_f_in_place(vector, op) --> apply unary op to every element of vector and store the result back to vector. Returns nothing
• apply_f_in_place(vector1, vector2, op) --> apply binary op to every pair from vecto1, vector2 and store the result back to vector1. Returns nothing

[kiliakis]

A small but important issue has to be fixed. If you look at apply_f function, the return type should be std::vector<return type of F>. I tried to extract F's return type (using result_of<F(T)>::type) but I'm missing something. @dpiparo Could you please advise?