How to pass an array of vectors by reference?

Question

#include <vector>
using std::vector;

int main(void)
{
    vector<int> gr[10];

    function(gr);
}

How should I define that function calling by reference rather than by value?

Answer 1

For pass by reference:

void foo( vector<int> const (&v)[10] )

Or sans const if foo is going to modify the actual argument.

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To avoid the problems of the inside-out original C syntax for declarations you can do this:

template< size_t n, class Item >
using raw_array_of_ = Item[n];

void bar( raw_array_of_<10, vector<int>> const& v );

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However, if you had used std::array in your main function, you could do just this:

void better( std::array<vector<int>, 10> const& v );

But this function doesn't accept a raw array as argument, only a std::array.