最終更新:2020-12-09 (水) 13:13:01 (1228d)

std
std::istreambuf_iterator
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コンストラクタ

bytes.assign(
   std::istreambuf_iterator<char>(in >> std::noskipws),
   std::istreambuf_iterator<char>());

It means it's initialized to be the end-of-stream iterator.
istream_iterator? has a special state end of stream iterator which is acquired when the end of the stream is reached or when an input operation fails.
The end of stream iterator is returned by the default constructor.
https://www.geeksforgeeks.org/stdistream_iterator-stdostream_iterator-c-stl/#:~:text=istream_iterator has a special state,returned by the default constructor.
デフォルトコンストラクタで構築されたistream_iteratorオブジェクトは、イテレータの終端値として使用できる。