Service for generating collection of subsets from passed collection(s) (std::array or std::vector).
Example:
Combinator(std::vector<int>({1, 2, 3}), 2) ≈ {
{1, 2},
{1, 3},
{2, 3},
};
Permutator(std::vector<int>({1, 2, 3}), 2) ≈ {
{1, 2},
{1, 3},
{2, 1},
{2, 3},
{3, 1},
{3, 2},
};
MultiPermutator(std::vector<int>({1, 2, 3}), 2) ≈ {
{1, 1},
{2, 1},
{3, 1},
{1, 2},
{2, 2},
{3, 2},
{1, 3},
{2, 3},
{3, 3},
};
Cartesian(std::vector<std::vector<int>>({std::vector<int>{1, 2}, {3, 4}})) ≈ {
{1, 3},
{2, 3},
{1, 4},
{2, 4},
};Works as forward-iterator and random-access-iterator, thus allows to generate arbitrary big sequenses, requiring minimum amount of memory.
Accepts collections of any objects (integers are shows as example).
Returns sets of std::array or std::vector (required type should be declared as template argument, or will be deducted from input argument).