Method discard_old

deps/GraphBLAS/CUDA/jitify.hpp:220–229

  size_t _capacity;

  inline void discard_old(size_t n = 0) {
    if (n > _capacity) {
      throw std::runtime_error("Insufficient capacity in cache");
    }
    while (_objects.size() > _capacity - n) {
      key_type discard_key = _ranked_keys.back();
      _ranked_keys.pop_back();
      _objects.erase(discard_key);
    }
  }

 public:
  inline ObjectCache(size_t capacity = 8) : _capacity(capacity) {}