Class SizeableStreambuf

src/Abyss/FileSystem/InputStream.h:8–11

namespace Abyss::FileSystem {

class SizeableStreambuf : public std::basic_streambuf<char> {
  public:
    [[nodiscard]] virtual auto size() const -> std::streamsize = 0;
};

class InputStream final : public std::istream {
    std::unique_ptr<std::streambuf> _streamBuff;