caxa_fe

#include <vector>

std::vector<A> row {};
std::vector<std::vector<A>> matrix {};

for ( size_t i = 0; i < rowsAmount; ++i)
{
    for( size_t j = 0; j < colsAmount; ++j)
    {
        row.push_back(objectA);
    }
    matrix.push_back(row);
    row.clear();
}