SmallVector.h

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#include <array>
 
namespace AmpGen {
  template <typename type, unsigned max_size> struct SmallVector {
    typedef type value_type;
 
    std::array<type, max_size> store = {0};
    unsigned size = 0;
    auto begin() const { return store.begin(); }
    auto end() const { return store.begin() + size; }
    auto begin() { return store.begin(); }
    auto end() { return store.begin() + size; }
    value_type &operator[](unsigned i) { return store[i]; }
    const value_type &operator[](unsigned i) const { return store[i]; }
    void push_back(const value_type &thing) { store[size++] = thing; }
    template <typename iterator_type, typename other_iterator_type> void insert(iterator_type mbegin, other_iterator_type ibegin, other_iterator_type iend) {
      for(auto it = ibegin; it != iend; ++it) { *(mbegin + (it - ibegin)) = *it; }
      size += (iend - ibegin);
    }
    SmallVector() = default;
    SmallVector(std::initializer_list<value_type> &&values) { insert(begin(), values.begin(), values.end()); }
    bool operator==(const SmallVector &other) const { return other.store == this->store; }
  };
}