How to fill a vector with non-trivial initial values?

Question

I know how to fill an std::vector with non-trivial initial values, e.g. sequence numbers:

void IndexArray( unsigned int length, std::vector&a         


        

Answer 1

I usually go with std::generate plus a simple generator:

template 
struct gen {
    T x;
    gen(T seed) : x(seed) { }

    T operator ()() { return x++; }
};

generate(a.begin(), a.end(), gen(0));