Class vec

crates/c-api/include/wasm.hh:50–185

template<class T>
class vec {
  static const size_t invalid_size = SIZE_MAX;

  size_t size_;
  std::unique_ptr<T[]> data_;

#ifdef WASM_API_DEBUG
  WASM_API_EXTERN void make_data();
  WASM_API_EXTERN void free_data();
#else
  void make_data() {}
  void free_data() {}
#endif

  vec(size_t size) : vec(size, size ? new(std::nothrow) T[size] : nullptr) {
    make_data();
  }

  vec(size_t size, T* data) : size_(size), data_(data) {
    assert(!!size_ == !!data_ || size_ == invalid_size);
  }

public:
  using elem_type = T;

  vec(vec<T>&& that) : vec(that.size_, that.data_.release()) {
    that.size_ = invalid_size;
  }

  ~vec() {
    free_data();
  }

  operator bool() const {
    return bool(size_ != invalid_size);
  }

  auto size() const -> size_t {
    return size_;
  }

  auto get() const -> const T* {
    return data_.get();
  }

  auto get() -> T* {
    return data_.get();
  }

  auto release() -> T* {
    size_ = invalid_size;
    return data_.release();
  }

  void reset() {
    free_data();
    size_ = invalid_size;
    data_.reset();