Method grow

include/fmt/format.h:791–813

  }

  static FMT_CONSTEXPR20 void grow(detail::buffer<T>& buf, size_t size) {
    detail::abort_fuzzing_if(size > 5000);
    auto& self = static_cast<basic_memory_buffer&>(buf);
    const size_t max_size =
        std::allocator_traits<Allocator>::max_size(self.alloc_);
    size_t old_capacity = buf.capacity();
    size_t new_capacity = old_capacity + old_capacity / 2;
    if (size > new_capacity)
      new_capacity = size;
    else if (new_capacity > max_size)
      new_capacity = max_of(size, max_size);
    T* old_data = buf.data();
    T* new_data = self.alloc_.allocate(new_capacity);
    // Suppress a bogus -Wstringop-overflow in gcc 13.1 (#3481).
    detail::assume(buf.size() <= new_capacity);
    // The following code doesn't throw, so the raw pointer above doesn't leak.
    memcpy(new_data, old_data, buf.size() * sizeof(T));
    self.set(new_data, new_capacity);
    // deallocate must not throw according to the standard, but even if it does,
    // the buffer already uses the new storage and will deallocate it in
    // destructor.
    if (old_data != self.store_) self.alloc_.deallocate(old_data, old_capacity);
  }

 public:
  using value_type = T;